An abrupt wind shift in western Europe at the onset of the Younger Dryas cold period

被引:252
作者
Brauer, Achim [1 ]
Haug, Gerald H. [2 ,3 ]
Dulski, Peter [1 ]
Sigman, Daniel M. [4 ]
Negendank, Joerg F. W. [1 ]
机构
[1] GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany
[2] ETH, Dept Earth Sci, Inst Geol, CH-8092 Zurich, Switzerland
[3] Univ Potsdam, Inst Geosci, DFG Leibniz Ctr Surface Proc & Ultimate Studies, D-14476 Potsdam, Germany
[4] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA
关键词
D O I
10.1038/ngeo263
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Younger Dryas cooling 12,700 years ago is one of the most abrupt climate changes observed in Northern Hemisphere palaeoclimate records(1-4). Annually laminated lake sediments are ideally suited to record the dynamics of such abrupt changes, as the seasonal deposition responds immediately to climate, and the varve counts provide an accurate estimate of the timing of the change. Here, we present sub-annual records of varve microfacies and geochemistry from Lake Meerfelder Maar in western Germany, providing one of the best dated records of this climate transition(5). Our data indicate an abrupt increase in storminess during the autumn to spring seasons, occurring from one year to the next at 12,679 yr BP, broadly coincident with other changes in this region. We suggest that this shift in wind strength represents an abrupt change in the North Atlantic westerlies towards a stronger and more zonal jet. Changes in meridional overturning circulation alone cannot fully explain the changes in European climate(6,7); we suggest the observed wind shift provides the mechanism for the strong temporal link between North Atlantic Ocean overturning circulation and European climate during deglaciation.
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页码:520 / 523
页数:4
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