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Chereskin, T. K., Scripps Institution of Oceanography, La Jolla, USA, tchereskin@ucsd.edu
Mazloff, M. R., Scripps Institution of Oceanography, La Jolla, USA, mmazloff@ucsd.edu
Millar, J. J., Scripps Institution of Oceanography, La Jolla, USA, jemillar@ucsd.edu
Firing, Y. L., Scripps Institution of Oceanography, La Jolla, USA, yfiring@ucsd.edu

A COMPARISON OF RECENT OBSERVATIONS IN DRAKE PASSAGE TO THE SOUTHERN OCEAN STATE ESTIMATE

Accurate model simulation of the ocean requires reproducing several metrics, including ocean heat content, geopotential height, mass transport, and eddy kinetic energy. We use observations from the recent cDrake experiment to evaluate the representation of these metrics in the Drake Passage in a Southern Ocean state estimate (SOSE). The observations consist of near-bottom currents, bottom pressure, and round-trip vertical acoustic travel time between sea floor and sea surface from an array of bottom-moored Current and Pressure-recording Inverted Echo Sounders (CPIES) deployed from 2007 to 2011, as well as hydrography and direct velocity observations from multiple cruises. The cDrake transport line (21 CPIES) spans 800 km across Drake Passage. The cDrake local dynamics array (21 CPIES) has spatial resolution sufficient to capture mesoscale eddies within the region of maximum surface variability between the Subantarctic and Polar Fronts. The SOSE is an eddy-permitting version of the MITgcm which is least-squares fit to ocean observations using the adjoint method. The independent cDrake observations are used here to evaluate the state estimate in Drake Passage prior to assimilation.

Session #:004
Date: 2/20/2012
Time: 08:30
Location: Ballroom I

Presentation is given by student: No