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The Development of the New GEOS-MITgcm Atmosphere-Ocean Model for Coupled Data Assimilation SystemDuring 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 MITgcm) 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 satellite and 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 (~ 1/8 deg) configuration of the GEOS atmosphere to a lat-lon-cap-1080 (~ 1/12 deg) 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.
Document ID
Document Type
Strobach, Ehud
(Maryland Univ. College Park, MD, United States)
Molod, Andrea M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Trayanov, Atanas L.
(Science Systems and Applications, Inc. Lanham, MD, United States)
Putman, William M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Forget, Gael
(Massachusetts Inst. of Technology (MIT) Cambridge, MA, United States)
Campin, Jean-Michel
(Massachusetts Inst. of Technology (MIT) Cambridge, MA, United States)
Hill, Christopher N.
(Massachusetts Inst. of Technology (MIT) Cambridge, MA, United States)
Menemenlis, Dimitris
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Heimbach, Patrick S.
(Texas Univ. Austin, TX, United States)
Date Acquired
November 7, 2018
Publication Date
October 16, 2018
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
Meeting Information
Meeting: IMS Seminar
Location: Bet Dagan
Country: Israel
Start Date: October 16, 2018
Sponsors: Israel Meteorological Service
Funding Number(s)
Distribution Limits
Use by or on behalf of the US Gov. Permitted.
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