Eddies in the North Brazil Current retroflection region observed by Geosat altimetry

Didden, Norbert and Schott, Friedrich (1993) Eddies in the North Brazil Current retroflection region observed by Geosat altimetry Journal of Geophysical Research: Oceans, 98 (C11). p. 20121. DOI 10.1029/93JC01184.

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Journal of Geophysical Research, Vol. 98, No. C11, Pages 20, 121-20,131, 1993.pdf - Reprinted Version

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Mesoscale fluctuations in the western tropical Atlantic are analyzed in Geosat altimetry sea surface height (SSH) and geostrophic velocity anomalies to investigate the role of eddies in the North Brazil Current (NBC) retroflection zone. The detachment of anticyclonic eddies from the NBC retroflection is observed during November through January, when the NBC retroflection into the North Equatorial Countercurrent (NECC) weakens and finally breaks down. These eddies are traced over more than 2 months between 50° and 60°W on their way toward the Caribbean, at average speeds of 15 cm s−1. In one case an apparent merger of two anticyclonic eddies occurs, one detached from the retroflection zone and one detached from the NECC. Cyclonic eddies are also observed but are generally less persistent. Mesoscale SSH variance just west of the retroflection increases by a factor of 2 from early summer to winter, mainly because of the anticyclonic eddies. Interhemispheric water mass transfer associated with the eddy flux out of the NBC retroflection may amount to an average transport of 3 Sv.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
DOI etc.: 10.1029/93JC01184
ISSN: 2169-9275
Projects: SFB133
Date Deposited: 05 Mar 2018 14:20
Last Modified: 05 Mar 2018 14:20
URI: http://eprints.uni-kiel.de/id/eprint/42154

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