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Outline. The PRISM project PRISM first coupler: Oasis3 (08/2003) PRISM final coupler (12/2004). The PRISM project. PRISM: PRogram for Integrated Earth System Modelling A European project, started December 2001, funded for 3 years by the European Commission (4.8 M€) Coordinators:

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Outline

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  1. Outline • The PRISM project • PRISM first coupler: Oasis3 (08/2003) • PRISM final coupler (12/2004)

  2. The PRISM project • PRISM: PRogram for Integrated Earth System Modelling • A European project, started December 2001, funded for 3 years by the European Commission (4.8 M€) • Coordinators: • Guy Brasseur (MPI, Hamburg) • Gerbrand Komen (KNMI, Amsterdam) • PRISM Director: Reinhard Budich (MPI)

  3. The PRISM project partners => 22 partners: leading climate research institutes and computer vendors • MPG-IMET, Germany • KNMI, Netherlands • MPI-MAD, • Met-Office, UK • UREADMY, UK • IPSL, France • Météo-France, France • CERFACS, France • DMI, Denmark • SHMI, Sweden • NERSC, Norway • ETH Zurich, Switzerland • ING, Italy • MPI-BGC, Germany • PIK, Germany • ECMWF, Europe • UCL-ASTR, Belgium • NEC Europe • FECIT/Fujitsu • SGI Europe • SUN Europe

  4. The PRISM project goals Help climate modellers spend more time on science: • Provide software infrastructure • to easily assemble Earth system coupled models based on existing state-of-art European components models • launch/monitor complex/ensembles Earth system simulations • Undertake a pilot infrastructure project toward, on the longer term, the establishment of a European Climate and Earth System Modeling Supercomputer Facility (ENES).

  5. The PRISM project goals • Define and promote technical and scientific standards for ESM: • Technical standards: • Compiling, running, post-processing environment • Graphical User Interface • Coupler and I/O software • Data and grid format • Coding and quality • Scientific standards: • Physical interfaces • Global Earth System parameters Interaction with other groups (ESMF, ESG/NOMADS, CF, RPN?,...)

  6. Atmosphere: Météo-France (ARPEGE), MPG-IMET(ECHAM), IPSL (LMDZ), MetOffice (Unified Model), UREADMY, INGV Atmospheric Chemistry: MPG-IMET, UREADMY, IPSL, MetOffice, Météo-France, KNMI Land Surface: IPSL (Orchidée), MetOffice, MPG-IMET, UREADMY, Météo-France (ISBA) Coupler: CERFACS, NEC, CCRLE, FECIT, SGI, MPI-MAD Regional Climate: SHMI, DMI, MetOffice Sea Ice: NERSC, UCL-ASTR, MetOffice, IPSL, MPG-IMET Ocean Biogeochemistry: MPI-BGC, IPSL, MPG-IMET, MetOffice Ocean: UREADMY, MetOffice (FOAM), MPI-M (HOPE), IPSL (OPA/ORCA) The PRISM project climate components

  7. The PRISM project first coupler: Oasis3 OASIS:OceanAtmosphereSeaIceSoil • developed since 1991 in CERFACS • to couple existing GCMs developed independently • at the time: • Models at relatively low resolution (~10000-20000 pts) • Small number of 2D coupling fields (~10) • Low coupling frequency (~once/day) • flexibility was very important, efficiency not so much! • performs: • synchronisation of the component models • coupling fields exchange and interpolation • I/O actions • new Oasis3 now available !

  8. The PRISM project first coupler: Oasis3 • Oasis3 configuration: • In text file namcouple read by Oasis3 at the beginning of the run, e.g. • total run time • number and names of component models • number and names of coupling fields; for each field: • coupling and/or I/O status, • coupling or I/O period • transformations/interpolations • … • Component model grid (longitudes, latitudes, masks, mesh surfaces, mesh corner locations) must be available in binary or NetCDF files.

  9. O A O A Oasis3 O A O B A B A B A A file A A The PRISM project first coupler: Oasis3 Oasis3 communication: • New PRISM System model interface (PSMILe) based on MPI1 or MPI2 message passing • Parallel communication between parallel models and Oasis3 interpolation process • Direct communication between models with same grid and partitioning • I/O functionality (automatic switch between coupled and forced mode) • Modularity: at each model time step, exchange is performed or not depending on user’s specifications in namcouple. • Automatic time integration depending on user’s specification

  10. The PRISM project first coupler: Oasis3 • Oasis3 communication; PSMILe API: : • Initialization: • call prism_init_comp(…) • Retrieval of component model local communicator • call prism_get_localcomm (…) • Coupling or I/O field declarations (name, type, shape, local partition, …) • call prism_def_var(field_idx, …) • End of definition • call prism_enddef(…) • In model time stepping loop, coupling or I/O field exchange • call prism_put(field_id1, time, field_array1, ierror), • call prism_get(field_id2, time, field_array2, ierror) • => Automatic averaging/accumulation, coupling exchange, and/or I/O depending on time argument and user’s specifications in namcouple • Termination: • call prism_terminate(…)

  11. Oasis3 O A O A Oasis3 O A O The PRISM project first coupler: Oasis3 • Oasis3 interpolations/transformations => performed by separate sequential process • => on 2D scalar fields only • Interfacing with RPN Fast Scalar INTerpolator package • nearest-neighbour, bilinear, bicubic for regular Lat-Lon grids • Interfacing with SCRIP1.4 library (Los Alamos Software Release LACC 98-45): • nearest-neighbour, 1st and 2nd order conservative remapping for all grids • bilinear and bicubic interpolation for «logically-rectangular» grids • Bilinear and bicubic interpolation for reduced atmospheric grids • Other spatial transformations: flux correction, merging, etc. • General algebraic operations

  12. Need to optimise and parallelise the coupler The PRISM project final coupler • Higher resolution, parallel and scalable models • Higher coupling frequencies desirable • Higher number of models and (3D) coupling fields • The final PRISM coupler will be composed of: • a Driver • a Transformer • a new PRISM System Model Interface Library

  13. The PRISM project final coupler • Final coupler configuration (XML files): • The user chooses the models through the GUI. • Each component model comes with: • an Application Description (AD) • a Potential Model Input and Output Description (PMIOD). • The user configures his particular coupled run through the GUI : • total run time, etc. • for each field described in the PMIOD: • coupling or I/O status, • coupling or I/O period • transformations/interpolations, etc. • Based on the user’s choice, the GUI produces: • the Specific Coupling Configuration (SCC) file • a Specific Model Input and Output Configuration (SMIOC) for each model • At run-time the Driver reads and distributes SCC and SMIOCs information • The PSMILes and Transformer act accordingly to the user’s specifications.

  14. ATM AD Driver ATM PMIOD V1: in, metadata V1 V2: out, metadata V2 V3: out, metadata V3 user user OCE AD • SCC • ATM:... • OCE:... • LAND:... user OCE PMIOD V1: out, metadata V1 V2: in, metadata V2 user ATM OCE OCE SMIOC V1 : to ATM, T1 V2 : from ATM, T2 ATM SMIOC V1 : from OCE, T1 V2: to OCE, T2 V3 : to LAND V1 V2 T user V1 V3 V2 LAND AD user LAND V4 LAND PMIOD V3: in, metadata V3 V4: in, metadata V4 Definition Phase fileV4 Composition Phase Deployment Phase LAND SMIOC V3 : from ATM V4 : from fileV4

  15. OB O1 OB C O1 C C C OB C The PRISM project final coupler Final coupler communication: • More elaborate PSMILe based on MPI1 or MPI2 • Modularity as for Oasis3: at each model time step, exchange is performed or not depending on user’s specifications in namcouple. • As for Oasis3, automatic time integration depending on user’s specification • As for Oasis3, I/O functionality (automatic switch between coupled and forced mode) • Parallel communication: as for Oasis3 + repartitioning. • Parallel calculation of interpolation weights and addresses in the source PSMILe • Extraction of useful part of source field only.

  16. The PRISM project final coupler Final coupler communication; PSMILe API: : • As for Oasis3 PSMILe + • Definition of grid (1D, 2D, 3D) • call prism_def_grid(…) • call prism_set_corners(…) • call prism_set_mask(…) • Definition of grid for vector and bundle fields • call prism_set_vector(…) • Call prism_set_subgrid(…) • Coupling or I/O field declarations support vector, bundles, 1D, 2D and 3D fields • Extraction of SCC and SMIOC information: • call prism_get_persist(…)

  17. The PRISM project final coupler • Final coupler interpolations/transformations • => as for Oasis3 + • Support of vector fields • Support of 3D fields • More flexibility for field combination/merging, etc.

  18. Conclusions • Oasis3 now available • Final coupler prototype due 11/2003 • Final coupler due 12/2004 • … and after PRISM ? • Follow-on project re-submitted at next EU-call in 2004 (CAPRI rejected) • International interaction essential in all cases! • Formal collaboration? • http://www.enes.org • http//www.cerfacs.fr/PRISM/prism.html • valcke@cerfacs.fr

  19. Driver Mi PMIOD V1: out, metadata V1 V2: out, metadata V2 V3: in, metadata V3 Mj PMIOD V1: in, metadata V1 V4: out, metadata V4 user user user SCC V1 : Mi -> Mj, Tli, Tnlij V2 : Mi -> Mj, Tij (+ V6) V4 : Mj -> Mk user Mj Mi Mj SMIOC V1 : cf SCC V4 : cf SCC Mi SMIOC V1 : cf SCC V2 : cf SCC V3 : in, fileV3, Tli V2 V7 V2 T V1 V1 V3 user V4 Mk PMIOD V4: in, metadata V4 V5: in, metadata V5 V7 fileV3 V6 V5 V5 user Mk fileV6 Mk SMIOC V4 : cf SCC V5 : in, fileV5, TnlV5k fileV5 Definition Phase Composition Phase Mi: Model i T: Transformer PMIOD: Potential Model Input and Output Description Deployment Phase SMIOC: Specific Model Input and Output Config. SCC: Specific Coupling Configuration

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