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Geology; June 2005; v. 33; no. 6; p. 461-464; DOI: 10.1130/G21401.1
© 2005 Geological Society of America
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Linking desert evolution and coastal upwelling: Pliocene climate change in Namibia

Lydie M. Dupont*,1, Barbara Donner1, Laurence Vidal2, Elena M. Pérez3 and Gerold Wefer4

1 Geosciences University of Bremen, D-28334 Bremen, Germany
2 Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, University of Aix-Marseille III, 13545 Aix en Provence cedex 04, France
3 Natural History Museum of Los Angeles County, Los Angeles, California 90007, USA
4 Geosciences University of Bremen, D-28334 Bremen, Germany

A late Pliocene high-resolution pollen record from the southeast Atlantic (Ocean Drilling Program Site 1082) registers vegetation development in southwest Africa. The marine record is continuous, ranges from 3.5 to 1.7 Ma, and has a millennial resolution between 2.9 and 1.9 Ma. Changes in climate and vegetation correspond to the Matuyama diatom maximum of the Namibian upwelling system and seem to be highly susceptible to latitudinal shifts in the Polar Front Zone of the Southern Ocean. A northward advance of the polar fronts is connected with an increase in winter rainfall in southwest Africa. Rapid desiccation in Namibia at 2.2 Ma is associated with increasing upwelling and decreasing sea- surface temperatures along the coast.

Key Words: pollen • vegetation • upwelling • Namib Desert • Pliocene • southern Africa




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