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Date
2013
Metadata
Показать полную информациюAbstract
The velocity structure of the Malvinas Current is described based on the\nanalysis of high-resolution hydrographic data and direct current\nobservations. The data show that though the current width exceeds 150km,\nthe flow is concentrated in two relatively narrow (10-20km) jets. Within\nthese cores, the direct observations indicate surface velocities\nexceeding 0.5m.s-1. Surface drifter, satellite-derived mean dynamic\ntopography, and sea surface temperature data suggest that the\nhigh-velocity jets are also ubiquitous features of the time mean\ncirculation. Both jets appear to be continuous features extending more\nthan 900km along the western slope of the Argentine Basin. These jets\nclosely follow the 200 and 1400m isobaths. Additional high-velocity\ncores are apparent in direct current measurements and hydrographic\nobservations, but these features are weaker and not continuous along the\nslope. Though the Malvinas Current transport is mostly barotropic,\nbaroclinic jets are also identified in relative geostrophic velocity\nsections. The baroclinic jets are colocated with the barotropic jets.\nOur results suggest that the main Malvinas Current core is located over\na relatively flat portion of the bottom, referred to as the Perito\nMoreno terrace. This observation is in agreement with recent seismic and\ngeological evidence suggesting that in geological time scales the\nMalvinas Current played a key role in the configuration of the bottom\nsediments over the western slope of the Argentine Basin.Journal
Journal of Geophysical Research: OceansVolume
118Issue/Article Nr
4Page Range
pp.2107-2117ae974a485f413a2113503eed53cd6c53
https://doi.org/10.1002/jgrc.20170
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