Journal
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
Volume 57, Issue 4, Pages 501-517Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2009.12.012
Keywords
Tropical Atlantic Ocean dynamics; Thermohaline structures; Barrier layers
Categories
Funding
- French Centre National d'Etude Spatiales (CNES)
- Institut de Recherche pour le Developpement (IRD) organizations
- Ministere de l'Education Nationale, de l'Enseignement Superieur et de la Recherche
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The ARAMIS project (Altimetrie sur un Rail Atlantique et Mesures In Situ) provides a long term survey (2002-2008) for thermohaline structures in the tropical Atlantic Ocean Here, these data are used to address questions regarding the existence and formation of barrier layers The analysis presented which uses different criteria to calculate isothermal layer depth and mixed layer depth, shows the sensitivity of different methods to a variety of variables. A 0 5 degrees C criterion for the isothermal layer and its equivalent in density change for the mixed layer are found to be the most adaptable due to their robustness. Barrier layers observed with ARAMIS data sets are in good agreement with climatologies and in-situ Argo floats along the route Three systems of barrier layers are observed during the voyages Their variability and formation as described in previous works concerned with the tropical Atlantic are analyzed. Different processes such as subduction, frontal activity, and precipitation are needed to explain their presence (C) 2010 Elsevier Ltd. All rights reserved
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