A sigma-coordinate ocean model implemented in a wide area of the Southern Ocean and forced by steady climatological winds is used to analyze the variability of the Subantarctic Front in the southwestern Atlantic. The low-frequency variability yields regime shifts on an interannual time scale in the Argentine Basin connecting an active and a collapsed Zapiola Anticyclone. The high-frequency variability, analyzed through a wavelet analysis, presents complex patterns composed of mesoscale eddies and topographic Rossby waves. Low- and high-frequency indices introduced to characterize the variability reveal possible mechanisms of mutual interactions.

Intrinsic variability of the Subantarctic Front in the southwestern Atlantic: a model study

2014

Abstract

A sigma-coordinate ocean model implemented in a wide area of the Southern Ocean and forced by steady climatological winds is used to analyze the variability of the Subantarctic Front in the southwestern Atlantic. The low-frequency variability yields regime shifts on an interannual time scale in the Argentine Basin connecting an active and a collapsed Zapiola Anticyclone. The high-frequency variability, analyzed through a wavelet analysis, presents complex patterns composed of mesoscale eddies and topographic Rossby waves. Low- and high-frequency indices introduced to characterize the variability reveal possible mechanisms of mutual interactions.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11367/32403
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