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Eddy–mean flow interactions in the Agulhas leakage region
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Eddy–mean flow interactions in the Agulhas leakage region
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Journal Article
Eddy–mean flow interactions in the Agulhas leakage region
2022
Overview
This research investigated the eddy–mean flow interactions in the Agulhas leakage region by utilizing the Ocean General Circulation Model for the Earth Simulator (OFES) output and an energetic analysis tool called the multiscale energetics and vorticity analysis tool (MS-EVA). MS-EVA relies on multiscale window transform (MWT) functional analysis and canonical transfer. It is found that the climatological characteristics of the nonlinear interactions between the eddy and mean flow exhibit mixed canonical transfers, including both barotropic and baroclinic canonical transfers. These canonical transfers are related to barotropic and baroclinic instabilities, respectively. These transfers are highly inhomogeneous in space, reaching their maxima around 18°–22° E and 36°–42° S, where the Agulhas Ring forms. Besides, the barotropic canonical transfers from the mean flow to the eddy tend to dominate the entire Agulhas leakage region, with a contribution ratio of 1.55 between the barotropic and baroclinic canonical transfers. These results suggest that barotropic instability plays a more important role in producing eddy activities in this region.
Publisher
Springer Nature Singapore,Springer Nature B.V
