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Oceanographic characterization of the Cape Verde region using multisensor data

ABSTRACT This study focuses on the characterisation of the northeast Tropical Atlantic region (3oN ≤ ϕ ≤ 30oN, 40oW ≤ λ ≤ 10oW) in terms of the main ocean circulation, sea surface temperature and associated phytopigment concentration patterns and their seasonal and interannual variability using multisensor remote sensing data. The data include radar altimetry from ERS-2 and Topex/Poseidon used to derive absolutedynamic topography (ADT) and surface geostrophic currents, sea surface temperature (SST) from ATSR-2 and AVHRR and chlorophyll-a concentrations from SeaWiFS. The first two data sets (altimetry and SST from AVHRR) cover 8 years, from June 1995 to May 2003.The SST data set from ATSR-2 covers a period of 1 year, from June 2001 to May 2002. The chlorophyll-a data set comprises nearly 6 years, from September 1997 to May 2003. The analysis of these data allowed the characterisation of the main current systems nd their variability, thea seasonal distribution of the SST and chlorophyll-a concentration and associated synergies between these data sets. The results of this analysis are discussed and the main conclusions are highlighted.