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Eddy Surface Properties and Propagation at Southern Hemisphere Western Boundary Current Systems : Volume 12, Issue 1 (09/02/2015)

By Pilo, G. S.

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Book Id: WPLBN0004020861
Format Type: PDF Article :
File Size: Pages 26
Reproduction Date: 2015

Title: Eddy Surface Properties and Propagation at Southern Hemisphere Western Boundary Current Systems : Volume 12, Issue 1 (09/02/2015)  
Author: Pilo, G. S.
Volume: Vol. 12, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Mata, M. M., L. Azeved, J. L., & Pilo, G. S. (2015). Eddy Surface Properties and Propagation at Southern Hemisphere Western Boundary Current Systems : Volume 12, Issue 1 (09/02/2015). Retrieved from

Description: Laboratorio de Estudos dos Oceanos e Clima, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brasil. Oceanic eddies occur in all world oceans, but are more energetic when associated to western boundary currents (WBC) systems. In these regions, eddies play an important role on mixing and energy exchange. Therefore, it is important to quantify and qualify eddies occurring within these systems. Previous studies performed eddy censuses in Southern Hemisphere WBC systems. However, important aspects of local eddy population are still unknown. Main questions to be answered relate to eddies' spatial distribution, propagation and lifetime within each system. Here, we use a global eddy dataset to qualify eddies based on their surface characteristics at the Agulhas Current (AC), the Brazil Current (BC) and the East Australian Current (EAC) Systems. We show that eddy propagation within each system is highly forced by the local mean flow and bathymetry. In the AC System, eddy polarity dictates its propagation distance. BC system eddies do not propagate beyond the Argentine Basin, and are advected by the local ocean circulation. EAC System eddies from both polarities cross south of Tasmania, but only anticyclonics reach the Great Australian Bight. Eddies in all systems and from both polarities presented a geographical segregation according to size. Large eddies occur along the Agulhas Retroflection, the Agulhas Return Current, the Brazil-Malvinas Confluence and the Coral Sea. Small eddies occur in the systems southernmost domains. Understanding eddies' propagation helps to establish monitoring programs, and to better understand how these features would affect local mixing.

Eddy Surface properties and propagation at Southern Hemisphere western boundary current systems

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