globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2848
论文题名:
Global atmospheric teleconnections during Dansgaard-Oeschger events
作者: Markle B.R.; Steig E.J.; Buizert C.; Schoenemann S.W.; Bitz C.M.; Fudge T.J.; Pedro J.B.; Ding Q.; Jones T.R.; White J.W.C.; Sowers T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:1
起始页码: 36
结束页码: 40
语种: 英语
Scopus关键词: atmospheric circulation ; climate variation ; Dansgaard-Oeschger cycle ; energy budget ; heat flux ; intertropical convergence zone ; Last Glacial ; Northern Hemisphere ; overturn ; paleoceanography ; Southern Hemisphere ; surface temperature ; teleconnection ; Antarctica ; Atlantic Ocean ; Atlantic Ocean (North) ; West Antarctica
英文摘要: During the last glacial period, the North Atlantic region experienced a series of Dansgaard-Oeschger cycles in which climate abruptly alternated between warm and cold periods. Corresponding variations in Antarctic surface temperature were out of phase with their Northern Hemisphere counterparts. The temperature relationship between the hemispheres is commonly attributed to an interhemispheric redistribution of heat by the ocean overturning circulation. Changes in ocean heat transport should be accompanied by changes in atmospheric circulation to satisfy global energy budget constraints. Although changes in tropical atmospheric circulation linked to abrupt events in the Northern Hemisphere are well documented, evidence for predicted changes in the Southern Hemisphere's atmospheric circulation during Dansgaard-Oeschger cycles is lacking. Here we use a high-resolution deuterium-excess record from West Antarctica to show that the latitude of the mean moisture source for Antarctic precipitation changed in phase with abrupt shifts in Northern Hemisphere climate, and significantly before Antarctic temperature change. This provides direct evidence that Southern Hemisphere mid-latitude storm tracks shifted within decades of abrupt changes in the North Atlantic, in parallel with meridional migrations of the intertropical convergence zone. We conclude that both oceanic and atmospheric processes, operating on different timescales, link the hemispheres during abrupt climate change. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105866
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; College of Earth, Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Centre for Ice and Climate, University of Copenhagen, Copenhagen, Denmark; Department of Geography, University of California, Santa Barbara, CA, United States; Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States; Department of Geosciences, Pennsylvania State University, University Park, PA, United States

Recommended Citation:
Markle B.R.,Steig E.J.,Buizert C.,et al. Global atmospheric teleconnections during Dansgaard-Oeschger events[J]. Nature Geoscience,2017-01-01,10(1)
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