DOI: 10.1002/2015GL066344
论文题名: Obliquity-driven expansion of North Atlantic sea ice during the last glacial
作者: Turney C.S.M. ; Thomas Z.A. ; Hutchinson D.K. ; Bradshaw C.J.A. ; Brook B.W. ; England M.H. ; Fogwill C.J. ; Jones R.T. ; Palmer J. ; Hughen K.A. ; Cooper A.
刊名: Geophysical Research Letters
ISSN: 0094-8363
EISSN: 1944-8094
出版年: 2015
卷: 42, 期: 23 起始页码: 10382
结束页码: 10390
语种: 英语
英文关键词: abrupt climate change
; geochronology
; Greenland ice cores
; late Pleistocene
; meridional overturning circulation
; tipping point
Scopus关键词: Climate change
; Geochronology
; Glacial geology
; Sea ice
; Abrupt climate change
; Greenland ice cores
; Late Pleistocene
; Meridional overturning circulations
; Tipping point
; Ice
; climate change
; geochronology
; ice core
; Last Glacial Maximum
; meridional circulation
; Northern Hemisphere
; overturn
; sea ice
; westerly
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Greenland
; Labrador Sea
英文摘要: North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D-O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ18O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate system modeling suggests that low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of meridional overturning circulation. The results suggest that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953639500&doi=10.1002%2f2015GL066344&partnerID=40&md5=ae6fe476e3e28d077bec4d5ff59e85ae
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7979
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Climate Change Research Centre, School of Biological, Earth, and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia
Recommended Citation:
Turney C.S.M.,Thomas Z.A.,Hutchinson D.K.,et al. Obliquity-driven expansion of North Atlantic sea ice during the last glacial[J]. Geophysical Research Letters,2015-01-01,42(23).