Thompson, L. ., University of Washington, Seattle, USA, luanne@u.washington.edu
Kelly, K. A., University of Washington, Seattle, USA, kkelly@apl.washington.edu
McClean, J. ., Scripps Institution of Oceanography, La Jolla, USA, jmcclean@ucsd.edu
Greiner, E. ., Mercator Ocean, Toulouse, France, egreiner@mercator-ocean.fr

USING HIGH RESOLUTION PROGNOSTIC AND ASSIMILATIVE MODELS OF THE NORTH ATLANTIC TO EXAMINE THE ROLE OF THE GULF STREAM IN INTERANNUAL CHANGES IN HEAT TRANSPORT

A 1/10th of a degree prognostic ocean model and a 1/3 of a degree assimilative model of the North Atlantic is used to evaluate the propagation of transport and heat anomalies from the subtropical gyre to the subpolar gyre through the Gulf Stream Extension and recirculation and around the Northwest Corner. The prognostic model (POP, Parallel Ocean Program) is run from 1980 to 1999 in the North Atlantic with daily forcing based on NCEP forecast winds (National Center for Environmental Prediction) with relaxation to observations at the Northern and Southern Boundary. The assimilative model (MERA11) is a reanalysis from 1992 to 2002 that assimilates a variety of observational data and is forced by ECMWF ERA 40 winds and was performed by the MERCATOR group. The assimilative model along with altimetry observations are used to evaluate the fidelity of the high resolution model. The reanalysis product shows evidence for warm anomalies propagating from the subtropical to subpolar gyre. Interannual variability of the upper ocean heat content in the prognostic model does not reproduce that in the observation, but because the model physics are internally consistent, it can be used to evaluate whether and how anomalies of mass and heat enter the Gulf Stream extension and remain coherent into the subpolar gyre.

Oral presentation

Presentation is given by student: No
Session #:055
Date: 03-07-2008
Time: 09:45

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