Physics
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3813703w&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 13, CiteID L13703
Physics
4
Geochemistry: Radiogenic Isotope Geochemistry, Geochemistry: Sedimentary Geochemistry, Global Change: Climate Dynamics (0429, 3309), Global Change: Regional Climate Change (4321)
Scientific paper
On the basis of a multi-proxy data set from the Gulf of Guinea (eastern equatorial Atlantic) we reconstruct the spatio-temporal evolution of the West African monsoon (WAM) and present evidence for a decoupling between latitudinal shifts of the rain belt and WAM intensification. The onset of deglacial monsoon invigoration at ˜16,600 years before present lagged northward migration of a weak rainfall zone by ˜2800 years. Conversely, during the Younger Dryas (YD) time interval, WAM precipitation was severely reduced but we find no evidence for a large-scale retreat of the rainfall front. This observation is not in agreement with the hypothesis of a large-scale shift of the intertropical convergence zone south of the tropical WAM region during the YD. Our results can be better reconciled with the newly emerging concept of a strong influence of Tropical Easterly and African Easterly Jets on modern WAM.
Frank Martin
Haley Brian
Sangen Mark
Stichel Torben
Weldeab Syee
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