Development of the GEOS-MIT gcm Atmosphere-Ocean Model for Coupled Data Assimilation

Strobach, Ehud ; Molod, Andrea ; Trayanov, Atanas ; Putman, William ; Forget, Gael ; Campin, Jean-Michel ; Hill, Chris ; Menemenlis, Dmitris ; Heimbach, Patrick

关键词: ATMOSPHERIC GENERAL CIRCULATION MODELS;    OCEAN MODELS;    DATA PROCESSING;    ASSIMILATION;    SIMULATION;    SEA SURFACE TEMPERATURE;    ATMOSPHERIC TEMPERATURE;    HIGH RESOLUTION;    AIR WATER INTERACTIONS;    SEA ICE;    WIND (METEOROLOGY);    CORRELATION;    EARTH OBSERVING SYSTEM (EOS);   

RP-ID  :  GSFC-E-DAA-TN62547

学科分类：地质物理学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

During the last two plus decades, The Goddard Earth Observing System (GEOS) and Massachusetts Institute of Technology (MIT) modeling groups have developed, respectively, atmosphere-only and ocean-only global general circulation models. These two models (GEOS and MIT-GCM (General Circulation Model)) have demonstrated their data assimilation capabilities with the recent releases of the Modern Era Reanalysis for Research Applications, Version 2 (MERRA-2) atmospheric reanalysis and the Estimating the Circulation and Climate of the Ocean, Version 4 (ECCO-v4) ocean (and sea ice) state estimate. Independently, the two modeling groups have also produced global atmosphere-only and ocean-only simulations with km-scale grid spacing which proved invaluable for process studies and for the development of satelliteand in-situ sampling strategies. Recently, a new effort has been made to couple these two models and to leverage their data-assimilation and high resolution capabilities (i.e., eddy-permitting ocean, cloud-permitting atmosphere). The focus in the model development is put on sub-seasonal to decadal time scales. In this talk, I discuss the new coupled model and present some first coupled simulation results. This will include a high-resolution coupled GEOS-MIT simulation, whereby we have coupled a cubed-sphere-720 (approximately 1/8 degrees) configuration of the GEOS atmosphere to a latitude-longitude-cap-1080 (approximately 1/12 degrees) configuration of the MIT ocean. We compare near-surface diagnostics of this fully coupled ocean-atmosphere set-up to equivalent atmosphere-only and ocean-only simulations. In the comparisons we focus in particular on the differences in air-sea interactions between sea surface temperature (SST) and wind for the coupled and uncoupled simulations.