Climatic changes during the last deglaciation recorded in sediment cores from the northeastern Brazilian Continental Margin |
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| Authors: | H W Arz J Pätzold G Wefer |
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| Institution: | Fachbereich Geowissenschaften, Universit?t Bremen, D-28334 Bremen, Germany, DE
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| Abstract: | Detailed 14C AMS data and isotope based stratigraphies from high-resolution paleoceanographic records for the last 22 ka of cores from
the upper continental slope off NE Brazil reveal sedimentation rates of up to 100 cm per 1000 yr. Variations in the sediment
composition relate to changes in the input of terrigenous material. The sedimentation is controlled by sea level and by the
climatic regime of the hinterland. Short-term changes in the tropical wind field may act as a climatic trigger. The zonality
of the SE trades was probably increased and the monsoonal activity over Africa reduced during the Younger Dryas period. |
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