期刊
OCEAN MODELLING
卷 95, 期 -, 页码 53-65出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ocemod.2015.09.005
关键词
Ocean eddies; Barotropic/baroclinic variability; Bathymetry-induced variability; Variance ellipses
资金
- CNES
- Australian Research Council [RM10240, DE150100223, FL100100214, CE110001028]
- United States National Science Foundation [OCE-1235310]
- Directorate For Geosciences
- Division Of Ocean Sciences [1235310] Funding Source: National Science Foundation
- Australian Research Council [DE150100223] Funding Source: Australian Research Council
The anisotropy of eddy variability in the global ocean is examined in geostrophic surface velocities derived from satellite observations and in the horizontal velocities of a 1/12 degrees global ocean model. Eddy anisotropy is of oceanographic interest as it is through anisotropic velocity fluctuations that the eddy and mean-flow fields interact dynamically. This study is timely because improved observational estimates of eddy anisotropy will soon be available with Surface Water and Ocean Topography (SWOT) altimetry data. We find there to be good agreement between the characteristics and distributions of eddy anisotropy from the present satellite observations and model ocean surface. In the model, eddy anisotropy is found to have significant vertical structure and is largest close to the ocean bottom, where the anisotropy aligns with the underlying isobaths. The highly anisotropic bottom signal is almost entirely contained in the barotropic variability. Upper-ocean variability is predominantly baroclinic and the alignment is less sensitive to the underlying bathymetry. These findings offer guidance for introducing a parameterization of eddy feedbacks, based on the eddy kinetic energy and underlying bathymetry, to operate on the barotropic flow and better account for the effects of barotropic Reynolds stresses unresolved in coarse-resolution ocean models. (C) 2015 Elsevier Ltd. All rights reserved.
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