Abrupt climate change revisited

被引：69
|
作者：
Broecker, Wallace S. [1 ]
机构：
[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
来源：
GLOBAL AND PLANETARY CHANGE | 2006年 / 54卷 / 3-4期
关键词：
conveyor; Younger Dryas; thermohaline; abrupt change; ice cores; radiocarbon;
D O I：
10.1016/j.gloplacha.2006.06.019
中图分类号：
P9 [自然地理学];
学科分类号：
0705 ; 070501 ;
摘要：
Taken together, evidence from east Greenland's mountain moraines and results from atmospheric models appear to provide the answer to a question which has long dogged abrupt climate change research: namely, how were impacts of the Younger Dryas (YD), Dansgaard-Oeschger (D-O) and Heinrich (H) events transmitted so quickly and efficiently throughout the northern hemisphere and tropics? The answer appears to lie in extensive winter sea ice formation which created Siberian-like conditions in the regions surrounding the northern Atlantic. Not only would this account for the ultra cold conditions in the north, but, as suggested by models, it would have pushed the tropical rain belt southward and weakened the monsoons. The requisite abrupt changes in the extent of sea ice cover are of course best explained by the turning on and turning off of the Atlantic's conveyor circulation. (c) 2006 Elsevier B.V. All rights reserved.
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收藏
页码：211 / 215
页数：5
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