1. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu First Field Tests of ESMF GMAO Seasonal Forecast NCAR/LANL CCSM NCEP Forecast GFDL FMS Suite MITgcm NASA GMAO Analysis Climate Data Assimilation Weather Chris Hill ESMF Community Meeting 2004 Boulder, CO

2. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Outline Interoperability Experiments CAM SSI CAM MITgcm MITgcm GFDL Atmos/Land/Sea-ice Conclusions

3. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Interoperability We want to validate and demonstrate – ESMF is compatible with existing applications. – ESMF can provide the technology to wire together these applications to form the basis for new configurations. Interoperability

4. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu ESMF Interoperability Demonstrations COUPLED CONFIGURATIONNEW SCIENCE ENABLED GFDL B-grid atm / MITgcm ocnIntroduction of global biogeochemistry into seasonal forecasts. GFDL MOM4 / NCEP forecastNew seasonal forecasting system. NSIPP ocean / LANL CICEExtension of seasonal prediction system to centennial timescales. NSIPP atm / DAO analysisAssimilated initial state for seasonal prediction system. DAO analysis / NCEP modelIntercomparison of systems for NASA/NOAA joint center for satellite data assimilation. NCAR CAM/ NCEP analysisIntercomparison of systems for NASA/NOAA joint center for satellite data assimilation. NCAR CAM / MITgcm ocnComponent exchange for improved climate prediction capability. NCEP WRF / GFDL MOM4Development of hurricane prediction capability. Due by completion of project - three highlighted have been demonstrated.

5. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH 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 (ESMF 1.5 and 1.6 based). Each demonstrates how ESMF solves the technical aspects of software interoperability, not the science of building and coupling systems

6. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Outline Interoperability Experiments CAM SSI CAM MITgcm MITgcm GFDL Atmos/Land/Sea-ice Conclusions

7. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu CAM-SSI Interoperability 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 has been coupled to the CAM NCAR fvCAM ENCAPSULATED AS ESMF GRIDDED COMPONENT NCAR fvCAM ESMF COUPLER COMPONENT NCEP SSI SSI ENCAPSULATED AS ESMF GRIDDED COMPONENT

8. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu 3 – Coupler passes SSI its input fields and SSI computes analysis increments (using production observation stream). 5 – ESMF based interoperability is demonstrated!4 – SSI returns updates to coupler which puts them in form for CAM. 2 – CAM Atmospheric temperatures are placed in an ESMF Export State and passed to a coupler that can map CAM fields to SSI fields. Can be downloaded to see how components were encapsulated Can be run on NCAR IBMs “blackforest” and “bluesky” – when run the experiment executes as follows 1 – CAM computes Atmospheric temperatures CAM-SSI Interoperability Demonstration NCAR fvCAM ENCAPSULATED AS ESMF GRIDDED COMPONENT NCAR fvCAM ESMF COUPLER COMPONENT NCEP SSI SSI ENCAPSULATED AS ESMF GRIDDED COMPONENT

9. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Outline Interoperability Experiments CAM SSI CAM MITgcm MITgcm GFDL Atmos/Land/Sea-ice Conclusions

10. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH 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, computational grid 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. images show output from actual runs. Demonstration is done passing SST from ocean to atmosphere – images show output from actual runs. ESMF COUPLER COMPONENT

11. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Outline Interoperability Experiments CAM SSI CAM MITgcm MITgcm GFDL Atmos/Land/Sea-ice Conclusions

12. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH 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, computational grid 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. images are from actual runs. 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 – images are from actual runs. ESMF COUPLER COMPONENT

13. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Under the hood Existing code Computational layer Component interface layer myrun()myinit() myfinal() ESMFrun()ESMFinit()ESMFfinal() Before After

14. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Outline Interoperability Experiments CAM SSI CAM MITgcm MITgcm GFDL Atmos/Land/Sea-ice Conclusions

15. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu Summary NCAR Community Atmospheric Model (CAM) coupled to NCEP Spectral Statistical Interpolation (SSI) System, both set up as ESMF components. Experiment utilizes same observational stream used operationally at NCEP 3 NCAR Community Atmospheric Model (CAM) coupled to MITgcm ocean Atmosphere, ocean, and coupler are set up as ESMF components Uses ESMF regridding tools to pass SST between component. 1 GFDL B-grid atmosphere coupled to MITgcm ocean Atmosphere, ocean, and coupler are set up as ESMF components Uses ESMF regridding tools to pass SST betweeen components. 2 Temperature SSI import Temperature SSI export Analysis increments All that has to be changed is the ESMF couplers.The same MITgcm are used in 1 and 3. The same CAM is used in 2 and 3. All that has to be changed is the ESMF couplers. Demonstrates how ESMF solves the technical aspects of software interoperability, not the science of building and coupling systems

16. NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH www.esmf.ucar.edu More Information ESMF website: http://www.esmf.ucar.eduhttp://www.esmf.ucar.edu Acknowledgements The ESMF is sponsored by the NASA Goddard Earth Science Technology Office.