Interhemispheric climate links revealed by a late-glacial cooling episode in southern Chile

被引:117
作者
Moreno, PI [1 ]
Jacobson, GL
Lowell, TV
Denton, GH
机构
[1] Univ Maine, Inst Quaternary & Climate Studies, Orono, ME 04469 USA
[2] Univ Maine, Dept Biol Sci, Orono, ME 04469 USA
[3] Univ Maine, Dept Geol Sci, Orono, ME 04469 USA
[4] Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
关键词
D O I
10.1038/35057252
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Understanding the relative timings of climate events in the Northern and Southern hemispheres is a prerequisite for determining the causes of abrupt climate changes. But climate records from the Patagonian Andes(1-4) and New Zealand(5-8) for the period of transition from glacial to interglacial conditions-about 14.6-10 kyr before present, as determined by radiocarbon dating-show varying degrees of correlation with similar records from the Northern Hemisphere. It is necessary to resolve these apparent discrepancies in order to be able to assess the relative roles of Northern Hemisphere ice sheets and oceanic, atmospheric and astronomical influences in initiating climate change in the late-glacial period. Here we report pollen records from three sites in the Lake District of southern Chile (41 degrees S) from which we infer conditions similar to modern climate between about 13 and 12.2 C-14 kyr before present (BP), followed by cooling events at about 12.2 and 11.4 (14)Ckyr BP, and then by a warming at about 9.8 (14)Ckyr BP. These events were nearly synchronous with important palaeoclimate changes recorded in the North Atlantic region(9), supporting the idea that interhemispheric linkage through the atmosphere was the primary control on climate during the last deglaciation. In other regions of the Southern Hemisphere, where climate events are not in phase with those in the Northern Hemisphere, local oceanic influences may have counteracted the effects that propagated through the atmosphere.
引用
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页码:804 / 808
页数:6
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