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Tropical Channel NEMO-OASIS-WRF Coupled simulations at very high resolution

Tropical Channel NEMO-OASIS-WRF Coupled simulations at very high resolution. Masson, S.*, C. Hourdin*, R. Benshila*, E. Maisonnave  , Y. Meurdesoif ★ , C. Mazauric ✪ , G. Samson  , F. Colas*, G. Madec*, R. Bourdalle-Badie  , S. Valcke  , L. Coquart 

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Tropical Channel NEMO-OASIS-WRF Coupled simulations at very high resolution

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  1. Tropical Channel NEMO-OASIS-WRF Coupled simulations at very high resolution Masson, S.*, C. Hourdin*, R. Benshila*, E. Maisonnave, Y. Meurdesoif★, C. Mazauric✪, G. Samson, F. Colas*, G. Madec*, R. Bourdalle-Badie, S. Valcke, L. Coquart * LOCEAN-IPSL,  CERFACS, ★LSCE-IPSL, ✪Bull S.A, Mercator-ocean started: 1 february 2012 length: 39 months equivalent of 6 persons full time

  2. SST small scales ⇔ large scales SST mean bias of IPCC models Our project • identify, quantify upscalling processes • propose an original solution...

  3. multi scales coupled models Global models Regional models • Original methodology • Optimum use of resources • Prepare future climate models Combine the advantages of regional and global models Upscalling processes in coastal upwelling aeras 1. Quantify the impact of small scale processes on global climate 2. Reduce large scale and recurrent biases in climate simulations

  4. Our models • Atmosphere : The Weather Research and Forecasting (WRF) • Ocean: NEMO (Consortium of 6 European patterns) is a state-of-the-art modeling framework for oceanographic research, operational oceanography seasonal forecast and climate studies. • Coupler: OASIS3-MCT software is allowing synchronized exchanges of coupling information between numerical codes representing different components of the climate system. Portability and flexibility are OASIS key design concepts and the reason of its success (Meteo France, IPSL, ECMWF, Met-Office, EC-Earth community, CMCC, MPI-Met…).

  5. Our methodology Compare the climate mean sate, variability and biases in a set of coupled experiments with resolutions of 27km to 9km (in zooms or at global scale). step 1: Tropical Channel (45°S - 45°N) 27km resolution in ocean and atmosphere

  6. step 2: embedded zooms onlyin 1 component (ocean or atmosphere) of the coupled model 27km tropical channel + 9km zooms

  7. step 3: embedded zooms on both components (ocean and atmosphere) of the coupled model. 27km tropical grid + 9km zooms

  8. Step 4: Tropical Channel (45°S - 45°N) 9km resolution in ocean and atmosphere

  9. Where are we now? 9km tropical Channel (45°S-45°N) • WRF Single-Moment 6-Class Microphysics • longwave Rapid Radiative Transfer Model • Dudhia shortwave radiation • MM5  Monin-Obukhov scheme • unified Noah land-surface model • Yonsei University PBL • Kain-Fritsch (new Eta) scheme • or Betts-Miller-Janjic scheme 8204 WRF 6h elapsed /1 month. 1.1To/months 2 × 2 years 1024 NEMO 3 years of spin-up 8204 WRF 512 NEMO first tests: 1 month

  10. numerical performances WRF WRF+NEMO = +5% 10s elapsed time 6h outputs 5s model time-step

  11. SST from coupled expériment

  12. OLR

  13. results...

  14. 10m wind speed

  15. OLR

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