Seasonal variability and coastal upwelling near Cape Santa Marta (Brazil)

作者: PAULA C. CAMPOS , Osmar O. Möller , ALBERTO R. PIOLA , ELBIO D. PALMA

DOI: 10.1002/JGRC.20131

关键词: Continental shelfWater massHydrographyWind stressCurrent (stream)Wind directionUpwellingPlumeClimatologyOceanographyGeology

摘要: [1] The Santa Marta Grande Cape (CSM) area, a relatively steep and narrow continental shelf off southeast Brazil, is under the influence of Brazil Current intense seasonal variations wind field that affect composition water masses their circulation. Hydrographic data, satellite-derived stress, numerical simulations are used to characterize shorter period variability oceanographic conditions CSM, in area between 27°S 30°S. The study focused on upwelling episodes dynamical mechanisms associated with these events. Field data results indicate significant changes structure, mass composition, balance. During fall winter, when southwesterly winds prevail frequency meteorological frontal systems increases, region characterized by waters origin, Plata Plume Water (PPW). spring summer, deeper reach surface layer due action northeasterly winds. Coastal events revealed temperature minima observed south CSM. Synoptic show occur pulses direction. Analysis shows this particular location band from synergy shelf-break regional circulation induced winds, both which modulated coastline orientation width.

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