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Communication incl. Poster: BibTeX citation key:  Brandt
Brandt, P., Fink, A. H., Hormann, V., Zantopp, R., Fisher, J. & Giese, B. 2009. The equatorial undercurrent in the central tropical Atlantic and its relation to the equatorial cold tongue. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-22 16:00:00
Categories: Ocean processes, Ocean-atmosphere interactions
Creators: Brandt, Fink, Fisher, Giese, Hormann, Zantopp
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The Tropical Atlantic Climate Experiment (TACE) represents a focused observational and modeling effort to enhance our understanding of Tropical Atlantic Climate Variability. During recent years, intense shipboard and moored observations were carried out within different national and international initiatives contributing to TACE. The current availability of a large number of cross-equatorial ship sections allows quantifying the mean flow structure in the central equatorial Atlantic. Velocity data from moored Acoustic Doppler current profilers that are deployed on the equator at 23°W between December 2001 and December 2002 as well as between February 2004 and February 2008 allow addressing the intraseasonal to interannual variability of the flow field along the equator. The interannual EUC variability is discussed with respect to the interannual boreal summer cold tongue variability showing substantial variations of the sea surface temperature during recent years. To address longer time scales, the latest SODA (Simple Ocean Data Assimilation Version 2.1.2) model for the time period 1958 – 2007 is analyzed. On interannual to decadal time scales, the SODA model shows a significant west-to-east weakening of the EUC core velocities over the time period 1996 to 2005, accompanied by a 1000 km westward shift of the equatorial cold tongue and an increase in the westward component of the zonal wind stress. The implications of these trends for the near-equatorial circulation are investigated.
Added by: roussot