1. www.esmf.ucar.edu ESMF Application Status GMAO Seasonal Forecast NCAR/LANL CCSM NCEP Forecast GFDL FMS Suite MITgcm NCEP/GMAO Analysis Climate Data Assimilation Weather Arlindo da Silva ESMF Interagency Working Group Meeting

2. www.esmf.ucar.edu Modeling Codes SOURCEAPPLICATION GFDLFMS B-grid atmosphere FMS spectral atmosphere FMS MOM4 ocean model MITMITgcm coupled atmosphere/ocean MITgcm regional and global ocean GMAOGMAO atmospheric GCM coupled with ocean GCM NCAR/LANLCCSM2 including CAM and CLM coupled with POP ocean and data ice model

3. www.esmf.ucar.edu Data Assimilation Codes SOURCEAPPLICATION GMAOGridpoint Statistical Interpolation (GSI) System (joint with NCEP) replaces Physical-space Statistical Analysis System (PSAS) GEOS-5 Atmospheric General Circulation Model replaces NSIPP Atmospheric General Circulation Model NCEPGridpoint Statistical Interpolation (GSI) System (joint with GMAO) replaces Spectral Statistical Interpolation (SSI) Global Spectral Forecasting Model WRF regional atmospheric model at 22km resolution CONUS forecast GMAOODAS with OI analysis system with ~10K observations/day MITMITgcm century / millennium adjoint sensitivity

4. www.esmf.ucar.edu ESMF Interoperability Demonstrations COUPLED CONFIGURATIONNEW SCIENCE ENABLED GFDL B-grid atm / MITgcm ocnGlobal biogeochemistry (CO2, O2), SI timescales. GFDL MOM4 / NCEP forecastNCEP seasonal forecasting system. GMAO ocean / LANL CICESea ice model for extension of SI system to centennial time scales. NSIPP atm / NCEP analysisAssimilated initial state for SI. GMAO GEOS-5/ NCEP GSIIntercomparison of systems for NASA/NOAA joint center for satellite data assimilation. NCAR fvCAM/ NCEP analysisIntercomparison of systems for NASA/NOAA joint center for satellite data assimilation. NCAR CAM / MITgcm ocnImproved climate predictive capability: climate sensitivity to large component interchange, optimized initial conditions. NCEP WRF / Ocean ModelDevelopment of hurricane prediction capability.

5. www.esmf.ucar.edu Interoperability Experiment Legend 1.Base version of both codes in experiment selected, and configuration decided upon (e.g. target platform, one/two way coupling, fields sent, duration). 2.Both codes run standalone as ESMF components, using component constructs but not necessarily creating valid states. 3.Fields that will be in import/export states of both codes match up with each other. 4.Both codes create valid ESMF import/export states, including fields with ESMF grids. 5.Draft coupler is written and full system with codes, stub coupler, and ESMF can be linked and run on target platform. 6.One field is transferred in some manner in one direction through the coupler. 7.ESMF regridding is used if needed. 8.All fields active in the experiment are correctly transferred and the experiment verified by outside source.

6. www.esmf.ucar.edu Interoperability Experiment Status

7. www.esmf.ucar.edu ESMF Adoption Legend Infrastructure (i = 1…6) Number indicates how many ESMF utilities are being used internal to the code. Superstructure (i=1…8) Base version of code selected, and configuration decided on (includes version, target platform, validation criteria). User component is restructured in an ESMF manner, but may not use ESMF software. User component builds valid states and presents standard ESMF interfaces. All gridded components run as ESMF stand-alone components - complete for non- coupled applications. A system with all components and stub coupler(s) links and runs, even though the coupler may not do anything, or may not use ESMF regridding. One field is transferred in some manner through the coupled system. ESMF regridding is used if needed. All active fields are correctly transferred, and experiment is verified by outside source.

8. www.esmf.ucar.edu ESMF Adoption Status

9. www.esmf.ucar.edu Specific Applications in first three demonstrations SOURCEAPPLICATION GFDLFMS B-grid atmosphere at N45L18 MITMITgcm ocean at 2.8°x2.8° ocean L15 NCAR NCEP fvCAM at 2°x2.5° SSI analysis system with 250K observations/day, 2 tracers Sources are available over the web through ESMF site. Each demonstrates how ESMF solves the technical aspects of software interoperability, not the science of building and coupling systems

10. www.esmf.ucar.edu NCAR Climate Model meets NCEP Data Assimilation NCAR Finite-volume Community Atmospheric Model (fvCAM) Finite-volume Dynamical Core developed at NASA/GSFC by S.-J. Lin Latest NCAR Physics packages NCEP Spectral Statistical Interpolation (SSI) System Assimilates a wealth of conventional and satellite data Demo utilizes same observational stream used operationally at NCEP For this Demo, we have developed both fvCAM and SSI as ESMF Grid Components and coupled them using ESMF services. This is the first time a state-of-the-art data assimilation system in coupled to the CAM ESMF GRIDDED COMPONENT NCAR fvCAM ESMF COUPLER COMPONENT NCEP SSI ESMF GRIDDED COMPONENT

11. www.esmf.ucar.edu fvCAM/SSI: Sea Level Pressure

12. www.esmf.ucar.edu NCAR fvCAM ENCAPSULATED AS ESMF GRIDDED COMPONENT NCAR fvCAM MITgcm ENCAPSULATED AS ESMF GRIDDED COMPONENT MITgcm MITgcm – CAM Interoperability In this experiment CAM is configured with 2 degree latitudinal resolution and 2.5 degree longitudinal resolution, resulting in a computational grid that is 144x90 grid points in the horizontal. The MITgcm ocean configuration uses 2.8125 degree resolution both zonally and meridionally. Both configurations execute domain decomposed into sixteen latitude circles, but at different resolutions. The experiment runs on 16 cpu’s and an ESMF coupler component using parallel ESMF_Regrid is used to map between them. Demonstration is done passing SST from ocean to atmosphere. ESMF COUPLER COMPONENT

13. www.esmf.ucar.edu GFDL ALS GFDL atmosphere-land-seaice (ALS) composite MITgcm Ocean MITgcm ENCAPSULATED AS ESMF GRIDDED COMPONENT GFDL Atm – MITgcm Interoperability In this experiment the atmosphere-land-ice composite component is configured with 2 degree latitudinal resolution and 2.5 degree longitudinal resolution, resulting in a computational grid that is 144x90 grid points in the horizontal. The MITgcm ocean configuration uses 2.8125 degree resolution both zonally and meridionally. The MITgcm configurations executes domain decomposed into thirty latitude circles. The atmosphere component executes decomposed into thirty longitude bands. Demonstration is done passing SST from ocean to atmosphere on 30 CPU’s. In this experiment the parallel regrid must map from latitude circle decomposition to longitude band decomposition. ESMF COUPLER COMPONENT

14. www.esmf.ucar.edu Timeline and Status Spring 2003 Spring 2004 First API and software release with Community Meeting review First 3 interoperability experiments completed Summer 2004Second API and software release (ESMF 2.0) with Community Meeting review. Winter 2004Five interoperability experiments completed; all codes partially ESMF-compliant Summer 2005All interoperability experiments complete. All codes fully ESMF- compliant. Winter 2005Final software release