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Simulation de l'atmosphère sur GPU. Earth simulator (Japon) 5120 procs * 7 Gflops = 36TFlops IDRIS (France) 80 procs * 16 Gflops = 1,3 TFlops.

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Presentation on theme: "Simulation de l'atmosphère sur GPU. Earth simulator (Japon) 5120 procs * 7 Gflops = 36TFlops IDRIS (France) 80 procs * 16 Gflops = 1,3 TFlops."— Presentation transcript:

1 Simulation de l'atmosphère sur GPU

2 Earth simulator (Japon) 5120 procs * 7 Gflops = 36TFlops IDRIS (France) 80 procs * 16 Gflops = 1,3 TFlops

3 Modèle simplifié en couches

4 Tsunami Tourbillons océaniques Formation des tempêtes

5 Megaflops Gigaflops Teraflops X Earthsimulator Contrairement à certaines prévisions, il n’y a pas eu de réel ralentissement des progrès dans l’efficacité du calcul numérique. Des machines “Petaflops” sont en cours de gestation.

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7 L’atmosphère et l’océan: deux fluides stratifiés

8 Earth System Model Physics Carbon Cycle Chemistry Atmospheric Circulatioèn Circulation Océanique Glace de mer Biogéochimieet biologie marine Carbon DMS Nutriments Chemistry Gases & Aérosols CO2 Continental surface sols et végétation LMD Z OrchidéeLMD ZT ORCALIM INCA STOMATE PISCES é Biochemistry Carbon CH 4, COV, Aérosols Aé Sels marins ContinentsAtmosphereOceans

9 Standard Running Environment : Ocean model 1- Rainfall + int. energy 2- Snowfall + int. energy 3- Incoming solar radiat. 4- Solar zenith angle 5- Fraction of diffuse solar radiation 6- Downward infrared radiation 7- Sensitivity of atmos temp. & humidity to surf. fluxes 1*- Sensible heat flux 2*- Surf. emissivity 3*- Albedo, direct 4*- Albedo, diffuse 5*- Surf. radiative temp. 6*- Evaporation + int. energy [+ Q lat ] 7*- Wind stress 8- Subgrid fractions 1- Surface pressure 2-4 Air temperature, humidity and wind 5- Wind module 6- Height of these 4 variables 1*-  C d 2*-  C e 3*-  C h 1 x - Non solar heat flux 2 x - Solar radiation 3 x - Fresh water flux 4 x - Salt flux 5 x - Wind stress 6 x - U^3 7 x - Mass of snow and ice 8- Subgrid fractions 1*- Surf. Temp 2*- Surf. Roughness 3*- Displacement height 4 x - Surface velocity 1- Continental runoff + internal Energy 1-2 Temp./Salinity at sea-ice base 3- Sea surface temperature 4- Surf. radiative temp. 5- Surface ocean current 6- Sea surface salinity 7- Surface height 8- Absorbed solar radiation (in first oceanic layer) Iceberg parameters PRISM Project Feb Ocean surface module Surface layer turbulence Sea ice model wave model Atmosphere model Land surface model Note on subgrid fraction dependance: <> x - Sea Ice categories (incl. open ocean) <>*- Sea Ice or Land Surf. categories A proposal for standard physical interfaces

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12 The Earth System: Coupling the Physical, Biogeochemical and Human Components


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