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Communication incl. Poster: BibTeX citation key:  Polo
Polo, I., Rodriguez de Fonseca, M. B., Lazar, A., Peter, A.-C. & Mignot, J. 2009. Growth and decay of the Tropical Atlantic Equatorial Mode: a closed budget analysis of the SST evolution in a coupled GCM. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-22 21:37:58
Categories: Ocean processes, Ocean-atmosphere interactions
Creators: Lazar, Mignot, Peter, Polo, Rodriguez de Fonseca
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The Equatorial Mode (EM), or Atlantic Niño, is tightly associated with the West African Monsoon (WAM) interannual variability. Several works based on observations and model experiments have explained how positive Sea Surface Temperature (SST) anomalies influence the rainfall over the Gulf of Guinea through a decrease of the local surface temperature gradient, weakening the monsoon flow and the surface convergence over the Sahel.
Regarding the processes controlling SST anomalies, there is agreement in the determination of the latent heat turbulent fluxes as the major component in damping the SST anomalies, although the generation of the mode is still controversial. Some authors find the anomalous surface wind to be also responsible through heat fluxes and the mixed layer changes. However, the Ekman transport and the oceanic wave propagation have been also identified as possible important processes explaining the time evolution from Angola/Benguela region to the Equator. Besides, there are still open questions about the feedback mechanisms at work in the actual TA EM. In the present work, we revisit the EM evolution in a full coupled GCM simulation of the last decades by analysing each process contribution in a closed oceanic heat budget.
Added by: roussot