HIRDLS Instrument Overview Software and Data Management by locknkey24

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									                                                                                                                                                                                                           HIRDLS Level-2 Science Data: Algorithms and Processing
                                                                                                                                                                                                               HIRDLS Level-2 Science Data: Algorithms and Processing
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      HIRDLS Level-2 Science Data : Algorithms and Processing

                                                                                                                                                                                                                                                                                                                                                                                                              Alyn Lambert(1), Ken A. Stone(2), Jim Craft(2), Cheryl A. Craig(1), David P. Edwards(1), John C. Gille(1,2), Brian R.
                                                                                                                                                                                                                                                                                                                                                                                                                               Johnson(1), Chris M. Halvorson(1), Steven T. Massie(1) and Joe M. McInerney(2).

                                                                                                                                                                                                                                                                                                                                                                                                                                                                              (1) National Center for Atmospheric Research, Boulder.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        (2) University of Colorado, Boulder.

                                                                                                                                                                                                                                                                                                                                                                                               The High Resolution Dynamics Limb Sounder (HIRDLS) is an infrared limb-scanning radiometer designed to measure
                                                                                                                                                                                                                                                                                                                                                                                               atmospheric limb emission in 21 spectral channels operating over the wavelength range from 6 m to 18m The inverse remote
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                m         m.
                                                                                                                                                                                                                                                                                                                                                                                               sounding problem for HIRDLS is to take the measurements of thermal limb radiances on a set of tangent heights with precisely
                                                                                                                                                                                                                                                                                                                                                                                               known spacing and to find a consistent solution in terms of vertical profiles of atmospheric temperature, pressure and constituent
                                                                                                                                                                                                                                                                                                                                                                                               mixing ratios with associated errors.

                                                                                                                                                                                                                                                                                                                                                                                               Successful processing of HIRDLS data will be determined to a large degree by how quickly and easily the science goals are met.
                                                                                                                                                                                                                                                                                                                                                                                               This will require a flexible "plug-and-play" integration of science algorithms within an efficient computational framework and
                                                                                                                                                                                                                                                                                                                                                                                               the power to visualize the results of prototyping efforts with minimal effort. Science algorithms, a solid framework and easy-to-
                                                                                                                                                                                                                                                                                                                                                                                               use visualization tools thus form the foundation of our efforts. Here we outline our approach at building a successful Level-2
                                                                                                                                                                                                                                                                                                                                                                                               processor and present results from the first phase of development.




                                                                                                                                                                                                                                                                                                                                                                                               HIRDLS Instrument Overview
                                      Instrument Cut-away View                                                                                                                                                                                                                                                                               Focal Plane                                                                                                                                                                                                                                                                       HIRDLS 1-Orbit 5x5 Global Mode Swath Coverage                                                               HIRDLS 12 Hour 5x5 Global Mode Coverage
                                        Instrument Cut-away View               IFC Mirror
                                                                                                                                           Space
                                                                                                                                                                                         Optical Schematic                                                                                                                    Composite FOV Out line
                                                                                                                                                                                                                                                                                                                                                                                  Alignment
                                                                     IFC Mirror                                                                                                                                                                                                                                                                                                  Quad Detector
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   HIRDLS Altitude Coverage
                                                                                                                                            View
                                                                                                                                            Port
                                                                                                                                                                             Space View            Space View
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Typical Scan Sequence
                                                                                                                                                                             Aperture Stop                         Field Stop #2                                  Lens                                                ch 18 H2 O                                              ch 5 CO2                            ch 17 CH4                                                                                                                                                                                                                                                                                                                                                                                                                                                             80                                                                                                                                                                        80
                                                                                                                                                                                                   Relay Mirror
                                                                                                                                                                                                                         &                                      Assembly
                                                                                                                                                                                                                    Warm Filter                                                                                       6.97 to 7.22 µm                                     14.71 to 15.27 µm                     7.30 to 7.55 µm

                                                                                                                                                                               Intermediate                          Assembly                                                                                                                                                                                                                                                                                         IFC Return Time: 3.55 S
                                                                                                                                                                                                                                   Ge Lens                                                               736 µm
                                                                                                                                                                                 Lyot Stop                                                                                                               9.0 km                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         70                                                                                                                                                                        70
                                                                                                                                                                                                                                     #1
Scan MirrorScan Mirror                                                                                                                                      Space View                                                                                                                                   2.98 mrad
           Assembly                                                                                                                                         Field Stop                                                                                       Fold                                                    ch 19 Aerosol                                            ch 4 CO2                          ch 16 ClONO2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          23.26
Assembly                                                                                                                                                                                                                                                            System




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Geopotential Height Gradient
                                                                                                                                           Albedo                                                                                                                                                                     7.06 to 7.13 µm                         2.9 mm       15.15 to 15.97 µm                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            60                                                                                                                                                                        60
                                                                                                                                                                                                                                                                    Aperture
                                                                                                                                           Shield                                                                                                                    Stop
                                                                                                                                                              Secondary
                                                                                                                                                                Mirror             Field                          Out-of-Field Baffle




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Temperature
                                                                                                                                                                                  Stop #1                                                                                                                                                                                                                                                                                                                                                                                             In-Flight Calibrator                                                                                                                                                                                                                                                                              50                                                                                                                                                                        50
                                                                                                                                                                                                                                                                    Ge Lens




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Pressure
                                                                                                                                                                                        Chopper                                                                                                                        ch 20 H2 O                                             ch 3 CO2                            ch 15 N2 O
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            To IFC Time: 2.2 S




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Ozone
                                                                                                                                                                                                Radiation
                                                                                                                                                                                                                                                                      #2                                                                                                                                                                                                                                                                                                                     (IFC)




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Altitude (km)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Altitude (km)
                                                                                                                                                        Telescope                                                                                                                                                    6.49 to 7.03 µm                                      15.63 to 16.39 µm                     7.80 to 7.96 µm




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Water Vapor
               IFC                                                                                                                                                                                 Trap                                 Primary                                             Space                                                                                                                                                                              Elevation         9.0 S




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Methane
                                                                                                                                                        Subsystem                                                                       Mirror                                                          81.8 µm
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        40                                                                                                                                                                        40
            Blackbody                                                                      Primary                                                                                   Chopper                                                                                                            1.0 km                                                                                                                                                                (LOS Deg)
                                                                                                                                                                                                                                                                         DSS                            0.332 mrad
                                                                                                                                                                                  Mechanical Unit




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            N2O
   IFC                                                                                     Mirror                                                                                                                                         Cold Filter




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  NO2
                                                                                                                                                                                                                                                                                                                                                                                                                                    4.50 mm
                                                                                                                                                                                                                                          Assembly                                                                                                                                                                                                                                                                                                               IFC Dwell Time: 1.25 S




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        N2O5
                                                                                                                                                                                                                                                                                                                       ch 21 NO2                                             ch 2 CO2                            ch 14 N2 O         55.0 km




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        ClONO2
                                                                                                                                                                                                                                                                                                                                                                                                                           5
Blackbody                                                                                                Primary
                                                                                                                                                                                                                    Primary                                                                                                                                                                                                         18.2 mrad                                                                                                                                                                                                                                                                                                                                                                                                                                           30                                                                                                                                                                        30




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               HNO3
                                                                                                                                                                                Scan                               Diffraction                                                                                       6.12 to 6.32 µm                                      16.26 to 16.67 µm                      7.94 to 8.14 µm
                                                                                                                                                                                Mirror                               Baffle
                                                                                                         Mirror                                         Structural Ther-




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      CFC-11

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               CFC-12
                                                                                                                                                                                                                     (PDB)




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Aerosol
                                                                                                                                                        mal Subsystem                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   20                                                                                                                                                                        20
            Chopper                                                                                                                                                                                                                                          Sunshield                      Earth
                                                                                                                                                                                                                                 "Hot Dog"                     Door                                                     ch 12 O3                                             ch 1 N2 O, Aero                    ch 13 Aerosol                                         26.35                       1.0 S




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Cloud
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Tops
                                                                                         Lens                                                                                                                                     Aperture                                                                           8.77 to 8.93 µm                                      17.01 to 17.76 µm                       8.20 to 8.33 µm
                                                                                       Assembly                                                                            In-flight                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    10                                                                                                                                                                        10
                         Space View                                                                                                                                        Calibrator
                          Aperture                                                                                                                                         Black Body
Chopper                                                Gyro                                                                                                                                                                                                                                                                                                                                                                                                                                -40            -28   -16             -4              8      20                                 58
                                                                   Detector                                                                                                                                                                                                                                             ch 11 O3                  1.39mm                    ch 6 Aerosol         0.65 mm          ch 7 CFC-11                                                                                                                                                                                                                                                                                                                                                                                                                                                            0                                                                                                                                                                        0
                                                                                                                                                                                                                             Sunshield                                                                                                            17.0 km                                        8.0 km
                                                                    Dewar                                 Lens                                                                                Calibrator
                                                                                                                                                                                                                               Door                                                                                  9.54 to 9.89 µm              5.63 mrad               11.96 to 12.18 µm      2.65 mrad     11.72 to 11.98 µm
                                                                                                                                                                                               Mirror
                                                                                                                                                                                                                             Aperture
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Azimuth (LOS Deg)
              Space View                                                                                Assembly
                                                                                                                                                                                                                                                    Fixed                                           818 µm
               Aperture                                                                                                                                                                                                                           Sunshade
                                                                                                                                                                                                                                                                                                    10.0 km
                                                                                                                                                                                                                                                                                                    3.32 mrad                                                                                                                                                                                                              Total Cycle Time = 66.0 S
                                                                                                                                                                                                                                                                                                                        ch 10 O3                                           ch 9 CFC-12                            ch 8 HNO3
                                                          Gyro                                                                                                                                                                                                                                                       9.90 to 10.10 µm                                     10.72 to 10.93 µm                    11.05 to 11.63 µm
                                                                         Detector                                                                                                                                                                                                                                                                             4.50 mm
                                                                          Dewar                                                                                                                                                                                                                                                                               55.0 km
                                                                                                                                                                                                                                                                                                                                                              18.2 mrad




                                                                                                                                                                                                                                                                                                                                                                            Software and Data Management
                           Data Processing Major Components                                                                                                                                                                                                                                      HIRDLS Standard Data Flow                                                                                                                                                                                                                                                                             Level 2 Processor                                                  Climatology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Data Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             A-priori
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Covariances
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Software Development Approach
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Beta Version                                     HIRDLS
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Level 1
                                                                                                                                                                                                                                                                                 HIRDLS Standard Science                                                                                                                                                                                                                                                                                                                                                                   CoLocate                                                                                                                       Science Algorithm Prototyping
                                                     SIPS Based Science Data Product Software                                                                                                                                                                                                                                                                                 Calibrate, Sort & Merge;                                                                                                                                                                                                                                                                     Ancillary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           CoLocAnc

                                                                                                                                                                                                                                                                                    Product Data Flow
                                                                                                                                                                                                                                                                                                                                                                               Geolocate Radiances
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Transmittance
                Level 0-1                    Level 1-2              Level 2-3
                                                                                                                                                                                                                                                                                       Level 0
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Goals                                  PreProcessor            Level 1+
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Heritage
                Processor                    Processor              Processor                        Quality Assurance    Browse Product                Metadata                                                                                                                                                                                                       Level 0 - 1                                                                              Level 1                                                                                                                                                                                                                                                                                            Algorithms                                                                                                                Subsequent
               (Calibrated                 (Geophysical             (Gridded                            Processors          Processors                 Processors
                                                                                                                                                                                                                                                                                      (CCSDS
                                                                                                                                                                                                                                                                                      Packets)
                                                                                                                                                                                                                                                                                                                                                                       Processor                                                                               Products                                                                                                                    •Solve the easy problem                                                                                                                                                                                                                                                                           Software
               Radiance)                    Parameters)            Parameters)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Versions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                •Build on success                  Optional
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           LOS Grid
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Retrieve
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Geophysical
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Parameters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Link       Forward Model
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Initial
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Requirements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Requirements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Review &                                                                                  Adoption of “Best Practices”
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Build system infrastructure                                                                                                                                                     Analysis                                                Update
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Data Format Definition as high
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      FIR Filters
                                                                                                                                                                                                                                                                                                                                                                       Low Rate
                                                                                                                                                                                                                                                                                                                                                                         Gyro
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Evolutionary prototype                                                                                              Optional      BBF
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Architectural                                             Design                                                                                                  level requirements specification.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Retrieved                                                                                      Design                                                  Update
                                                                                                                                                                                                                                                                                                                                                                         Data
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Identify data connections and                        FOV Data
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Parameters                                                                                                                                                                                                                                                      •Project wide visibility of plan and
          SCF Based SDP                                                    SCF Based                                                         SCF Based Data                                                                                                                                                                                                                                                                                                                                                                                                                                content                                                                        LOS Gridder
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           FOV Data
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Subprojects                                                                                                                            progress.
                                                                        Operations Support                                                   Analysis Support                                                                                                                                            Geopotential Height
          Support Software                                                                                                                                                                                                                                                          Level 3             Gradient Determination
                                                                                                                                                                                                                                                                                                                                                                       Level 2-3
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Flexible implementation                                Symbol Key
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                HDF-EOS
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Build HDF File
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Detailed
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Design
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Detailed
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Design
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Configuration management
                                                                            Software                                                            Software                                                                                                                          Geopotential                                                                                                                                                                                                                                                                                                                                                Data File
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Swath                                                                                          Detailed                                              Detailed
                                                                                                                                                                                                                                                                                    Height
                                                                                                                                                                                                                                                                                                                                                                         Gyro
                                                                                                                                                                                                                                                                                                                                                                       Processor
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Learning experience                                                            Second Pass+
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Design
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Build
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Design
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Build
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           (defect tracking, version history,
                                                                                                                                            Data Access                                                                                                                            Products                                                                                                                                                                                                                                                                                                                                                         Processor                                                                                                                          ...                                                   ...
       Prototype            SDP Service
                                                                         Q/A Analysis
                                                                                                      Mission
                                                                                                                                                and
                                                                                                                                                                   Data                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Sub-System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           HIRDLS                                                                                      Build                                                 Build                                                                                                                         testing, and requirements tracing)
      Data Product           and Utility                                                              Planning                                                  Management                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Test                                                Test
       Algorithms            Software
                                                                                                                                            Visualization
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Level 2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Beta Version                                                        Test                                                  Test
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           •Inspections and peer reviews at
                             Calibration
                                                                                                     IST/SCF                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              System                                              System                                                                                       all levels.
      Data Product                                                              Data                   Data                                          Data Analysis                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Testing                                             Testing
                              Analysis                                                                                                                                                                                                                                         Kalman Filter approach        Level 2-3                                                  Level 2                                                 Level 1 - 2
       Simulators
                              Software
                                                                              Validation             Exchange
                                                                                                     Software
                                                                                                                                                         Tools
                                                                                                                                                                                                                                                                                  to global gridding         Processor                                                 Products                                                 Processor                                                                                                                                                                                   Implementation Approach                                                                                                                             Beta Version                                         Engineering Version

                                                                                                                                                                                                                                                                                                                                                                                                                    Retrieval of Mixing
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          •Sub-systems linked with straightforward scripting language
         Science
         Support
                             Instrument
                               Support                                                                                                                                                                                                                                                                                                                                                                            Ratio, Temperature and                                                                                                                                                       •Promotes easy testing of units and parallel development.                                                                                                                        Incremental software life-cycle
         Software             Software                                    Distributed Science Application Software                                                                                                                                                                                                                                                                                                        Aerosols                                                                                                                                                                                                                                                                                                                                                           Technically a modified waterfall with sub-projects and risk reduction.
                                                                                                              Detailed
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               •Reduces risk involved with massive processor.
                                                                               Atmospheric
                                                                                Chemical
                                                                                                              Radiative
                                                                                                                             Atmospheric
                                                                                                                              Dynamics
                                                                                                                                                                                                                                                                                                                 Level 3
                                                                                                                                                                                                                                                                                                                Products                                                                                                                                                                                                                                                                  •Allow for parallel computations                                                                                                                                                                       Sub-projects allow stand-alone modules (e.g., forward model, pre-processor)
                                                                                                              Transfer                                                                                                                                                                                                                                                                                                        Product Types
                                                                                 Models
                                                                                                               Models
                                                                                                                               Models                                                                                                                                                                                                                                                                        Input                Standard      Intermediate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               •Scaleable shared-memory multiprocessor architecture(I.e., SGI Origin 2000).                                                                                                                      to be developed in parallel and promotes easier testing and simulation work.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               •Process groups of profiles on separate CPUs.                                                                                                                                                     Incremental deliveries prevent science/product group disconnects.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Focus on input/output/process definitions and requirements.

								
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