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Antiphasing between Rainfall in Africa's Rift Valley and North America's Great Basin

Published online by Cambridge University Press:  20 January 2017

Wallace S. Broecker ,
Dorothy Peteet ,
Irena Hajdas ,
Jo Lin  and
Elizabeth Clark
Wallace S. Broecker
Affiliation:
Lamont–Doherty Earth Observatory, Palisades, New York, 10964
Dorothy Peteet
Affiliation:
Lamont–Doherty Earth Observatory, Palisades, New York, 10964
Irena Hajdas
Affiliation:
ITP ETH Hoenggerberg, CH-8093, Zürich, Switzerland
Jo Lin
Affiliation:
Department of Geography, University of California, Berkeley, California, 94720
Elizabeth Clark
Affiliation:
Lamont–Doherty Earth Observatory, Palisades, New York, 10964
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Abstract

The beginning of the Bølling-Allerød warm period was marked in Greenland ice by an abrupt rise in δ18O, an abrupt drop in dust rain, and an abrupt increase in atmospheric methane content. The surface waters in the Norwegian Sea underwent a simultaneous abrupt warming. At about this time, a major change in the pattern of global rainfall occurred. Lake Victoria (latitude 0°), which prior to this time was dry, was rejuvenated. The Red Sea, which prior to this time was hypersaline, freshened. Lake Lahontan, which prior to this time had achieved its largest size, desiccated. Whereas the chronologic support for the abruptness of the hydrologic changes is firm only for the Red Sea, in keeping with evidence obtained well away from the northern Atlantic in the Santa Barbara Basin and the Cariaco Trench, the onset and end of the millennial-duration climate events were globally abrupt. If so, the proposed linkage between the size of African closed basin lakes and insolation cycles must be reexamined.

Keywords

AfricaGreat BasinpaleoclimateLake VictoriaLake Lahontan14Cagesabrupt climate change
Type
Original Articles
Information
Quaternary Research , Volume 50 , Issue 1 , July 1998 , pp. 12 - 20
Copyright
University of Washington

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