First Field Tests of ESMF

1. First Field Tests of ESMF NCAR/LANL CCSM Climate GFDL FMS Suite Data Assimilation NASA GMAO Analysis GMAO Seasonal Forecast MITgcm Weather Chris Hill ESMF Community Meeting 2004 Boulder, CO NCEP Forecast

2. Outline • Interoperability Experiments • CAM SSI • CAM MITgcm • MITgcm GFDL Atmos/Land/Sea-ice • Conclusions

3. 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 Interoperability

4. ESMF Interoperability Demonstrations Due by completion of project - three highlighted have been demonstrated.

5. Specific Applications in first three demonstrations 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. Outline • Interoperability Experiments • CAM SSI • CAM MITgcm • MITgcm GFDL Atmos/Land/Sea-ice • Conclusions

7. 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 NCEP SSI NCAR fvCAM ESMF COUPLER COMPONENT SSI ENCAPSULATED AS ESMF GRIDDED COMPONENT NCAR fvCAM ENCAPSULATED AS ESMF GRIDDED COMPONENT

8. 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 CAM-SSI Interoperability Demonstration 2 – CAM Atmospheric temperatures are placed in an ESMF Export State and passed to a coupler that can map CAM fields to SSI fields. 1 – CAM computes Atmospheric temperatures 4 – SSI returns updates to coupler which puts them in form for CAM. 5 – ESMF based interoperability is demonstrated! 3 – Coupler passes SSI its input fields and SSI computes analysis increments (using production observation stream). NCEP SSI NCAR fvCAM ESMF COUPLER COMPONENT SSI ENCAPSULATED AS ESMF GRIDDED COMPONENT NCAR fvCAM ENCAPSULATED AS ESMF GRIDDED COMPONENT

9. Outline • Interoperability Experiments • CAM SSI • CAM MITgcm • MITgcm GFDL Atmos/Land/Sea-ice • Conclusions

10. 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. Demonstration is done passing SST from ocean to atmosphere – images show output from actual runs. MITgcm NCAR fvCAM ESMF COUPLER COMPONENT MITgcm ENCAPSULATED AS ESMF GRIDDED COMPONENT NCAR fvCAM ENCAPSULATED AS ESMF GRIDDED COMPONENT

11. Outline • Interoperability Experiments • CAM SSI • CAM MITgcm • MITgcm GFDL Atmos/Land/Sea-ice • Conclusions

12. 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. 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. MITgcm Ocean GFDL atmosphere-land-seaice (ALS) composite ESMF COUPLER COMPONENT MITgcm ENCAPSULATED AS ESMF GRIDDED COMPONENT GFDL ALS

13. Under the hood Before Existing code After ESMFrun() ESMFinit() ESMFfinal() Component interface layer myrun() myinit() myfinal() Computational layer

14. Outline • Interoperability Experiments • CAM SSI • CAM MITgcm • MITgcm GFDL Atmos/Land/Sea-ice • Conclusions

15. Summary 2 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. Temperature SSI import Temperature SSI export Analysis increments 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 • 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. More Information ESMF website:http://www.esmf.ucar.edu Acknowledgements The ESMF is sponsored by the NASA Goddard Earth Science Technology Office.