Lagrangian measurements in the Malvinas current.

Peterson, R. G., Johnson, Ch. S., Krauß, Wolfgang and Davis, R. (1996) Lagrangian measurements in the Malvinas current. In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, Gerold and Webb, D. J.. Springer, Berlin, Heidelberg, New York, pp. 239-247. DOI 10.1007/978-3-642-80353-6_12.

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Abstract

Direct measurements of magnitude of the northward flow of the Malvinas (Falkland) Current have recently been made with two types of Lagrangian platforms: ALACE floats which cycled between 750-m depth and the sea surface, and 100-m drogued surface drifters. Each data set clearly delineates the path of the Malvinas Current, and the vertical shears inferred from them are commensurate with historical geostrophic shears. Velocities from the surface drifters are used here to adjust geostrophic shears from historical measurements, and the results confirm a large transport of the current, as previously implied by numerical models and a regional inverse calculation. At 42°S, the northward transport of the Malvinas Current in the upper 3000 m appears to be about 70 Sv, several times larger than estimates obtained by adjusting geostrophic shears to assumed levels of no motion. This large barotropie component may have significance in the cross-frontal transfer of intermediate and deep waters from the circumpolar current to the adjacent flow regimes in the South Atlantic, and thus on the inter-basin exchange of water masses.

Document Type: Book chapter
Additional Information: Das Buch ist in der GEOMAR-Bibliothek vorhanden.
Keywords: Antarctic, Circumpolar Current, Drake Passage, North Atlantic, Deep Water, Brazil Current, Surface Drifter
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
DOI etc.: 10.1007/978-3-642-80353-6_12
Date Deposited: 18 Feb 2008 17:23
Last Modified: 03 Apr 2020 08:32
URI: http://oceanrep.geomar.de/id/eprint/5787

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