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Presentation outline. 1 – PRISM General Presentation 2 - PRISM Goals 3 - PRISM Scientific and Technical Standards 4 - PRISM Coupling and I/O Syste m 5 - PRISM first coupler: Oasis 3.0. 1 – PRISM General Presentation. PRISM: PRogram for Integrated Earth System Modelling

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  1. Presentation outline 1 – PRISM General Presentation 2 - PRISM Goals 3 - PRISM Scientific and Technical Standards 4 - PRISM Coupling and I/O System 5 - PRISM first coupler: Oasis 3.0

  2. 1 – PRISM General Presentation • PRISM: PRogram for Integrated Earth System Modelling • A European project, started December 2001, funded by the European Commission (4.8 M€) • Coordinators: • Guy Brasseur (MPI, Hamburg) • Gerbrand Komen (KNMI, Amsterdam) • PRISM Director: Reinhard Budich (MPI)

  3. 1 – PRISM General Presentation => 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. 2 - PRISM 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 • Define and promote technical and scientific standards for Earth System modelling • Undertake a pilot infrastructure project toward, on the longer term, the establishment of a European Climate and Earth System Modeling Supercomputer Facility.

  5. 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) 2 - PRISM Goals

  6. 3 - PRISM scientific and technical standards Scientific standards: • Physical interfaces • Global Earth System parameters Technical standards: • Architecture and User Interface • Coupler and I/O • Data and grid format • Coding and quality Interaction with other groups (ESMF, ESG/NOMADS, CF...)

  7. 4- PRISM Coupling and I/O System Keynotes - PSMILe – Driver - Transformer • PRISM Coupling and I/O System = • Model Interface Library (PSMILe) + Driver+ Transformer • Programming language: Fortran 90 and C • All sofware produced are open source • Coupling and I/O system use freely available open source software products external libraries, hidden from the model developer (MPICH, LAM-MPI, NetCDF, libXML, mpp_io, SCRIP, …) • Vendors may provide optimized versions for specific independent software components (e.g. MPI, NetCDF)

  8. OB O1 OB C O1 C C C C C C T T C OB C OB O2 OB C O2 OB C OB OB file C OB C 4 - PRISM Coupling and I/O System Keynotes - PSMILe – Driver - Transformer • Insures data coupling exchanges between any two component models either directly or via or the transformer including repartitioning with MPI1 or MPI2 • Insures data input/output from/to files • =>Switch between coupling exchanges • and input/output is: • indicated by the user in a coupling configuration file (XML) • transparent for the component model • managed automatically by the PSMILe

  9. 4 - PRISM Coupling and I/O System Keynotes - PSMILe – Driver - Transformer • Concise and extendable interface • Coupling data produced by a source model can be consumed by more than one target model and at a different frequency. • Coupling data may be only partially consumed by the target model (extraction of subspaces, hyper-slabs or indexed grid points). • Local operation on the coupling data can performed before exchange.

  10. 4 - PRISM Coupling and I/O System Keynotes - PSMILe – Driver - Transformer • Different classes of primitives insuring: • The Startup phase • Initialization; prism_init(…), … • Termination of definition; prism_enddef(…) • The Definition phase • Definition of Grid; prism_def_grid(…), prism_set_mask(…), … • Definition of Data; prism_def_var(…) • The Transfer of fields • Exchange or I/O of Data; prism_put(…), prism_get(…) • The Termination phase • Termination of PRISM application; prism_terminate(…)

  11. 4 - PRISM Coupling and I/O System Keynotes - PSMILe – Driver - Transformer • Launching of component models: - static: all at beginning of simulation (MPMD or SPMD) • Distribution of global information: - initial date, calendar, coupling parameters, etc. • Component model monitoring: - centralises all logging messages sent by the models during the simulation (timestep, restart saved, etc.)

  12. 4 - PRISM Coupling and I/O System Keynotes - PSMILe – Driver - Transformer • Different transformations: • Spatial interpolation: nearest-neighbour, bilinear, bicubic, conservative remapping, … • Other spatial transformations: flux correction, merging, etc. • General algebraic operations • Combination of coupling data produced by one model may have to be combined before the exchange. • On different types of fields • 1D, 2D, 3D, 4D, scalar or vector, static or dynamic structure • On different types of grids • regular, gaussian, stretched, reduced, unstructured, etc.

  13. 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

  14. 5 - PRISM First Coupler: Oasis 3.0 • => Available for beta testers • New PRISM System model interface (PSMILe V.0) • Using MPI1 or MPI2 and Conforming with final PRISM coupler interface. • Direct communication between models with same grid and partitioning • Modularity: prism_put and prism_get may be called at each model • time step; exchange is performed or not by PSMILe, depending on • user’s specifications in namcouple. • Automatic time integration by PSMILe depending on user’s specification • I/O and combined I/O and coupling functionalities • New interpolations / interfacing with SCRIP library: • 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 • F90 rewriting (dynamic memory allocation) • NetCDF format for grid and restart auxiliary files

  15. Contact us: http://www.enes.org Sophie.valcke@cerfacs.fr Damien.Declat@cerfacs.fr Rene.Redler@ccrl-nece.de Latour@fujitsu.fr Reiner@munich.sgi.com Schoenemey@compuserve.de

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