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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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