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Rosburg, K. ., University of Rhode Island, Graduate School of Oceanography, Narragansett, USA, rosburk@students.wwu.edu
Donohue, K. A., University of Rhode Island, Graduate School of Oceanography, Narragansett, USA, kdonohue@gso.uri.edu
Chassignet, E. ., Florida State University, Dept. of Oceanogrpahy, Tallahassee, USA, echassignet@coaps.fsu.edu

PERFORMANCE EVALUATION OF HYCOM GULF OF MEXICO MODEL

In 2009, a comprehensive field study began, aimed to investigate Loop Current circulation dynamics, eddy-shedding mechanisms, and forcing of lower-layer flows in the Gulf of Mexico. This study utilized a mapping array centered near 26°N 87°W, which consisted of 9 full-depth and 7 near-bottom moorings as well as 25 bottom-mounted pressure equipped inverted echo sounders. Moorings were deployed in April 2009 and data recovered via rotation or telemetry in July and November 2010. Measurements were compared to output from the 1/25th degree resolution Gulf of Mexico HYCOM model with data assimilation. Model-to-mooring comparison revealed high temperature correlations and moderate to high correlations for both zonal and meridional velocity, with array-averaged correlations in the thermocline of 0.83, 0.71, and 0.79, respectively. Time-averaged eddy kinetic energy (EKE) showed comparable, but higher, values of deep EKE in the mooring array. A case study of upper and lower layer flows during the separation of Loop Current Eddy Franklin showed similar features between model and mooring array. In particular, both indicate that deep cyclones are generated beneath the Loop Current during the separation process.

Poster presentation

Session #:113
Date: 2/22/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: B1333