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Communication incl. Poster: BibTeX citation key:  Caniauxc
Caniaux, G., Wade, M. & Giordani, H. 2009. Statistical analysis of the Atlantic Cold Tongue. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-23 21:01:32
Categories: Ocean processes, Ocean-atmosphere interactions
Creators: Caniaux, Giordani, Wade
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The Atlantic Cold Tongue (ACT) is the major seasonal signal of the central and eastern part of the Tropical Atlantic basin. The ACT appears in certain areas along the southern side of the Equator and is strongly connected with cold waters developing offshore the western coast of Africa, south of the Equator. Its interannual variability have been studied with the Reynolds sea surface temperature field series which cover an extended 27 years long period (1982-2008).
In order to characterize its role in the air-sea coupling system, and which year the ACT could be studied in priority, both its spatial extent, its mean temperature index and its period of formation / disappearance have been considered. An additional index is proposed to characterize the intense sea surface temperature gradients present every year along its northern boundary.
This analysis shows a succession of cold and warm events, with large or reduced extent, formed early or late in the season with a high degree of interannual variability. Interestingly, these parameters are far from being inter-connected. For instance, the earliest year for the ACT formation among the past 27 years is 2005, a normal year in term of temperature and extension. Furthermore no trend can be noted in the different series examined. This high variability suggest that the ACT formation, development and maintenance can be related to a large variety of influential factors (among them the mixed layer depth or the iso-20° depth during the oceanic preconditioning phase) with various degrees of strength.
Added by: roussot