Fronts et circulation de surface dans l Atlantique Sud Ouest

Abstract : The development of an objective method to detect surface thermal fronts on a basis of eleven years of AVHRR data made possible to study the variations of the amplitude and position of surface fronts. In the Brazil-Malvinas collision region, only one front is observed in AVHRR and color water images. This front pivots around a fixed point (39.5°S, 53.5°W) between a NS orientation in winter and NW-SE orientation in summer. The division of the South-western Atlantic in biophysical regions is studied with a neuronal network method and with a method based on histograms, the data being means of sea surface temperature (SST), SST gradient and color water satellite retrieved data. The variability of the current that surrounds the Zapiola rise is studied using in-situ data (ARGO floats and hydrology from WOCE A11 cruise) and altimetry. An eddy-forcing mechanism, which could explain the variability observed, is discussed.
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https://tel.archives-ouvertes.fr/tel-00011417
Contributor : Martin Saraceno <>
Submitted on : Wednesday, January 18, 2006 - 6:42:28 PM
Last modification on : Tuesday, June 18, 2019 - 1:19:05 AM
Long-term archiving on : Saturday, April 3, 2010 - 7:33:59 PM

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  • HAL Id : tel-00011417, version 1

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Martin Saraceno. Fronts et circulation de surface dans l Atlantique Sud Ouest. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011417⟩

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