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Communication incl. Poster: BibTeX citation key:  Charria
Charria, G., Bourlès, B., Marin, F., Du Penhoat, Y., Testut, L., Rousseau, N., Techine, P. & Roblou, L. 2009. Interannual variability of November-December cooling in the Gulf of Guinea close to the São Tomé island. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-22 21:17:36
Categories: Ocean processes, Ocean-atmosphere interactions
Creators: Bourlès, Charria, Marin, Du Penhoat, Roblou, Rousseau, Techine, Testut
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Based on the tide gauge and the meteorological station measurements on the São Tomé island (0.33N, 6.73E), a sea level anomaly time series has been reconstructed from August 2000 to November 2005. Sea level anomalies are compared to the gridded altimetry products (1/4° of spatial resolution) in the region. The aim of this study is to investigate the dominant interannual anomalies observed in the Gulf of Guinea. A first wavelet analysis reveals unexpected anomalies end of 2001 and 2004 compared to the seasonal cycle. These events, also observed in the dynamic height anomalies from the PIRATA moorings (23W, 10W and 0E / 0N), seem related to the November-December cooling previously described as a component of the zonal mode of the equatorial ocean-atmosphere. In 2001, a larger November-December cooling is detected over the basin. At the opposite, end of 2004 and despite the small amount of data, the anomaly observed in the spectral analysis can be associated to a sharper transition and a larger gradient between the cold season and the previous warm months.
To confirm these preliminary conclusions, we investigate how these anomalies propagate in sea level anomalies and sea surface temperature from the central equatorial Atlantic to the eastern part of the basin. The role of the wind influence is also under investigation using remotely sensed Quikscat measurements.
Added by: roussot