NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO www.esmf.ucar.edu The Earth System Modeling Framework.

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NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO The Earth System Modeling Framework CLIMATE DATA ASSIMILATION WEATHER HDF and HDF-EOS Workshop VII Silver Spring, MD September 2003 Arlindo da Silva Global Modeling and Assimilation Office NASA/Goddard Space Flight Center

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO Project Overview GOAL: To increase software reuse, interoperability, ease of use and performance portability in climate, weather, and data assimilation applications PRODUCTS: Coupling superstructure and utility infrastructure software Synthetic code suite for validation and demonstration Set of 15 ESMF-compliant applications (including CCSM, WRF, GFDL models, MIT, NCEP and NASA data assimilation systems) Set of 8 interoperability experiments RESOURCES: $10M over 3 years

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO The ESMF Team Teams and PIs:Part I: Core ESMF Development (Killeen, NCAR) Part II: Modeling Applications (Marshall, MIT) Part III: Data Assimilation Applications (da Silva, NASA DAO) Core Technical Leads: V. Balaji/GFDL, Cecelia DeLuca/NCAR, Chris Hill/MIT Co-Investigators:NASA/GSFC-DAO, NASA/GSFC-NSIPP, DOE/LANL, DOE/ANL, University of Michigan, MIT, NSF/NCAR-SCD, NSF/NCAR-CGD, NSF/NCAR-MMM, NOAA/NCEP, NOAA/GFDL Term:3 years, starting February 2002

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO Deployment Activities NSIPP Seasonal Forecast NCAR/LANL CCSM NCEP Forecast GFDL FMS Suite MITgcm NASA GSFC PSAS

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO 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. NSIPP ocean / LANL CICESea ice model for extension of SI system to centennial time scales. NSIPP atm / DAO analysisAssimilated initial state for SI. DAO analysis / NCEP modelIntercomparison of systems for NASA/NOAA joint center for satellite data assimilation. DAO CAM-fv / NCEP analysisIntercomparison of systems for NASA/NOAA joint center for satellite data assimilation. NCAR CAM Eul / MITgcm ocnImproved climate predictive capability: climate sensitivity to large component interchange, optimized initial conditions. NCEP WRF / GFDL MOM4Development of hurricane prediction capability.

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO ESMF INFRASTRUCTURE integrated system utilities ESMF SUPERSTRUCTURE coupling services user-created model components Architecture gridded components, coupling components, custom components grids, transforms, communication kernel, timekeeping, …

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO Superstructure Classes Gridded Component(s) Array Computation Data Application Component FieldBundleState Coupler Component(s)

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO ESMF Class Structure MachineModel Layout DistGrid PhysGrid State Bundle Gridded Component Array Utilities: TimeMgr, Config, LogErr, I/O etc. F90 Superstructure Infrastructure Field Grid Regrid Comm Data Communications Route Coupler Component C++ Application Component

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO Infrastructure: Utilities Base I/O Attributes Machine Model PE List Layout Basic Communications Time Manager Registry Error Handling Logging Performance Profiling Configuration Attributes

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO Infrastructure: ESMF I/O Requirement analysis has been completed, design is in progress The ESMF I/O layer must support: – Structured gridded data – Unstructured gridded data – Observational data on location stream ESMF I/O must support multiple data formats: – NetCDF, HDF 4, HDF 5, HDF-EOS – GRIB, BUFR – IEEE binary, GrADS compatible binary

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO ESMF I/O: Metadata Convention The ESMF, along with the European PRISM framework, have adopted the Climate-Forecast (CF) conventions The CF conventions, now described in XML and independent of NetCDF, specify standard dimensions, and specify standard units for these dimensions and other quantities The ESMF team will work together with CF community to extend the CF conventions to support the variety of gridded/ungridded data we require. Other conventions such as HDF-EOS will co-exist with CF (as in current GMAO data products).

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO ESMF I/O: Parallel Support Two major drivers for I/O performance: – Enhancement in model resolution – Increase in I/O frequency Modes of Parallel I/O: – Single-threaded I/O – Multi-threaded, multi-fileset I/O – Multi-threaded, single fileset I/O (2) Synchronous and asynchronous I/O (2)

NSF NCAR | NASA GSFC | DOE LANL ANL | NOAA NCEP GFDL | MIT | U MICH Arlindo da Silva, NASA/GSFC/GMAO Summary ESMF eliminates software barriers to collaboration among organizations – Easy exchange of model components accelerates progress in NWP and climate modeling – Independently developed models and data assimilation methods can be combined and tested – Coupled model development becomes truly distributed process – Advances from smaller academic groups easily adopted by large modeling centers ESMF facilitates development of new interdisciplinary collaborations – Simplifies extension of climate models to upper atmosphere – Accelerates inclusion of advanced biogeochemical components into climate models – Develops clear path for many other communities to use, improve, and extend climate models – Many new model components gain easy access to the power of data assimilation