Process modeling studies of physical mechanisms of the formation of an anticyclonic eddy in the central Red Sea

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Chen, Changsheng
Li, Ruixiang
Pratt, Lawrence J.
Limeburner, Richard
Beardsley, Robert C.
Bower, Amy S.
Jiang, Houshuo
Abualnaja, Yasser
Xu, Qichun
Lin, Huichan
Liu, Xuehai
Lan, Jian
Kim, Taewan
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Eddies in the Red Sea
Surface drifters released in the central Red Sea during April 2010 detected a well-defined anticyclonic eddy around 23°N. This eddy was ∼45–60 km in radius, with a swirl speed up to ∼0.5 m/s. The eddy feature was also evident in monthly averaged sea surface height fields and in current profiles measured on a cross-isobath, shipboard CTD/ADCP survey around that region. The unstructured-grid, Finite-Volume Community Ocean Model (FVCOM) was configured for the Red Sea and process studies were conducted to establish the conditions necessary for the eddy to form and to establish its robustness. The model was capable of reproducing the observed anticyclonic eddy with the same location and size. Diagnosis of model results suggests that the eddy can be formed in a Red Sea that is subject to seasonally varying buoyancy forcing, with no wind, but that its location and structure are significantly altered by wind forcing, initial distribution of water stratification and southward coastal flow from the upstream area. Momentum analysis indicates that the flow field of the eddy was in geostrophic balance, with the baroclinic pressure gradient forcing about the same order of magnitude as the surface pressure gradient forcing.
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 1445–1464, doi:10.1002/2013JC009351.
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Journal of Geophysical Research: Oceans 119 (2014): 1445–1464
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