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USE OF ESMF IN THE GEOS-5 MODELING AND ASSIMILATION SYSTEM

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									     GEOS-5:
 An ESMF-based
   Modeling and
Assimilation System
  ESMF Community Meeting

         23 May 2006
      GEOS-5 ESMF DESIGN
• In GEOS-5 we chose to use a fine-grain
  component design –– ESMF components are
  used down to the parameterization level; they
  must therefore be fairly light-weight.

• We use a hierarchical topology, using
  Composite Components, and so we are
  concerned with the relations (couplings)
  between parents and children, and between
  siblings, cousins, etc.
         Hierarchical Component Structure
                                                      ESMF Gridded Component

Small, light-weight   “Cap”                           ESMF Coupler Component
gridded components
based on GEOS_Generic
services


                                  COMPOSITE
                                 COMPONENTS
                              (“physical” Couplers)




                                                       “True” couplers
         BASE COMPONENTS                               Can be generic
             GEOS-5 AGCM COMPONENT STRUCTURE
                                                                 CAP

                                                                                          HISTORY
                                                       AGCM

                       COLUMN PROCESSES                                                 OGCM
                                                    (qv, ql, qi, cl,…)


    RADIATION                                          MOIST


  SOLAR                                               CHEM

               IR              TURB                (O3,…,Qdust,…)
                                                                                   DYNAMICS
                                        SURFACE

                                                                         FVCORE           GWD
             LAND                ICE              LAKE
                                (Ts,Fi...)                               (u, v, T, p)
                                                    (Ts,Fi...)
   CATCH            VEGDYN
(Tc, qc, Td,...)
                                      SALTWATER
                    (Ci,...)                       (Tskin,Hskin,...)
   GEOS-5 SINGLE-COLUMN STRUCTURE
                                             CAP

                                                              HISTORY
                                         AGCM

              COLUMN PROCESSES


RADIATION                                MOIST


SOLAR
                                            CHEM
        IR            TURB                                  DYNAMICS
                               SURFACE                 DYNAMICS
                             SURFACE

                                                   FVCORE     GWD
    LAND               ICE           LAKE

CATCH        VEGDYN
                         SALTWATER
GEOS-GENERIC: An ESMF Implementation Layer

• Three major extensions of ESMF concepts:

   – GEOS Generic provides default Initialize, Run, and Finalize
     methods and a Generic SetServices to do ESMF “boilerplate”

   – In GEOS Generic, SetServices is extended to provide data and
     connectivity services.

   – GEOS Generic defines an ESMF Internal State


• A more general version of the GG Implementation Layer
  is being developed under NASA’s MAP Program
GG DATA SERVICES AND THE THREE STATES

• Data services allow you to describe your import, export
  and internal states, giving each variable attributes like
  names, units, dimensionality, usage attributes, grid
  associations, etc.

• Import states are read only to you. Export states are
  read only to others. This allows the passing of pointers
  rather than copies and so lightens the coupling.

• GEOS Generic creates, allocates and initializes, as
  appropriate, variables in all three states, putting them in
  ESMF classes (Arrays, Fields, Bundles, States) that are
  used by the infrastructure.

• Import and Internal states are optionally checkpointed
  and restarted by Generic Initialize and Generic Finalize.
GG Connectivity Diagram
Children’s imports                                       HISTORY
are satisfied among
by siblings or added
                                           Exports are passed up from
to parent’s imports,
                                           child to parent, until they
until the reach the
cap.                         CAP           reach the cap, where they
                                           can be written out.


                         COLUMN PHYSICS


             RADIATION                           MOIST


                            TURB          CHEM
            SOLAR

                       IR
              GEOS5: MAP Hurricane Forecasting
                      Precipitation Rate

1 degree resolution
                                                                                              Increasing resolution
                                               0.5 degree resolution

                                                                                               improves realism of
                                                                                           forecasts of the details in
                                                                                                     nature
                                                                                            2-day Katrina forecasts



                      0.25 degree resolution
                                                                                        Sea Level Pressure

                                                                        1 degree resolution                  0.5 degree resolution




                                                                       0.25 degree resolution        Verifying Analysis from NOAA/NCEP
                 Weather - climate interactions

                                                 Hurricane Katrina (Aug 2005)
                                                 Accumulated rainfall (mm)




                                                      GEOS-5: 1/4 degree
                                                          forecast




The number of Named Atlantic Tropical Storms
and Jun-Nov Storm Generation Potential (SGP)
from the ensemble mean of 14 C20C simulations.
SGP is computed for the area (10-20N; 80-20W).

                                                 Courtesy Xin Lin & Julio Bacmeister
NWP mode
1/4 degree




                         GEOS-5 AGCM
                         APPLICATIONS
    Climate Forecasts:
         1 degree




                               DAS mode:
                               1/2 degree
      Future Directions for GEOS-5
         ESMF Implementations

• Coupled Atmospheric Chemistry & Aerosols
  – GOCART, GSFC STRAT, GMI (Many participants)
• Atmosphere-Ocean Coupling
  – Poseidon (Schopf); MOM-4 (Balaji &Co.); MIT-GCM (Hill)
• Atmoshere, Land, and Ocean Assimilation Systems
  – GSI (NCEP); Ocean and Land EnKFs (Keppenne-Rienecker, Reichle)

• Land BioGeoChemistry and Vegetation Dynamics
  – Ent Model (Kiang at GISS and Moorcroft at Harvard)
• Ocean BioGeoChem and Radiation
  – (W. Gregg, GSFC)
                  GEOS-5 COUPLED CHEMISTRY
                                                           CAP

                                                                             HISTORY
                                                        AGCM

                      COLUMN PROCESSES                                  OGCM
RADIATION
                                  MOIST
SOLAR
        IR            TURB                             AEROCHEM             DYNAMICS
                             SURFACE
                                                                        FVCORE    GWD

    LAND               ICE             LAKE
CATCH        VEGDYN
                                                              GSFC
                         SALTWATER
                                                            StratChem
                                              GOCART                        GMI

                                       DU                               EMISS
                                        BC              Pchem                     DEPOs
                                         SS
                                          SU
                                            OC                              CHEM
                                                   GEOS-5 Coupled Model
                                                               CAP                 HISTORY


                                                               GCM


               AGCM                                                                OGCM


                                                                          OGCM
                                               AGCM
               COLUMN PROCESSES
                                                                                     SEA ICE
RADIATION                              MOIST


SOLAR                                 CHEM                     MIT-OGCM
        IR        TURB
                         SURFACE
                                                   DYNAMICS
                                                               Poseidon            ORAD
                                                                            OBIO
                                               FVCORE    GWD
    LAND

CATCH
                      ICE           LAKE
                                                               MOM-4
             VEGDYN
                        SALTWATER
                                               GEOS-5 Stand-Alone Ocean
                                                               CAP                 HISTORY


                                                               GCM


               AGCM                                                                OGCM


                                                                          OGCM
                                               AGCM
               COLUMN PROCESSES
                                                                                     SEA ICE
RADIATION                              MOIST


SOLAR                                 CHEM                     MIT-OGCM
        IR        TURB
                         SURFACE
                                                   DYNAMICS
                                                               Poseidon            ORAD
                                                                            OBIO
                                               FVCORE    GWD
    LAND

CATCH
                      ICE           LAKE
                                                               MOM-4
             VEGDYN
                        SALTWATER
The GEOS-5 Exchange Grid


            GEOS5
   GEOS-5 Ocean-Atmosphere Communication



               ATM Xchg <-> OCN Xchg
                      ReDist




        AGCM                             OGCM
ATM LogRec<->ATM Xchg            OCN LogRec<->OCN Xchg



                   LOCAL OPERATIONS
                                          MERRA
                               http://gmao.gsfc.nasa.gov/merra/
                        Michael Bosilovich, Siegfried Schubert & Gi-Kong Kim




MERRA Objectives

Half-Degree by 72L to .01 mb
1979-present
Parallel AMIP run
GSI Analysis with IAU

EMPHASIS ON WATER CYCLE
     Global Precipitation,
    Evaporation, Land Hydrology,
    Cloud parameters and TPW

GLOBAL HEAT AND WATER BUDGETS
FOR ALL PROCESSES

DIURNAL CYCLE FROM HOURLY 2-D
FIELDS


                                                                               18
       GEOS-5 Data Assimilation Systems
                      CAP               HISTORY


                      DAS


        ADAS                     ODAS



AGCM           AANA      OGCM           OANA
                          OGCM
                           OGCM
                            OGCM
                             OGCM
               GSI            OGCM         EnKF
                               OGCM
                                OGCM
                   REPLAY                   REPLAY
                SUMMARY
• GEOS-5 is a modeling and assimilation system
  based on many ESMF gridded components.
• It uses a highly configurable hierarchical
  architecture with a fine-grain ESMF
  implementation
• It relies on an implementation layer (GEOS-
  Generic) to facilitate the construction and
  coupling of the ESMF GCs.
• It is being expanded to include coupled climate,
  chemistry, and biological processes, and to run
  on-line, coupled assimilation systems.

								
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