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Obliquity-driven expansion of North Atlantic sea ice during the last glacial

Citation

Turney, CSM and Thomas, ZA and Hutchinson, DK and Bradshaw, CJA and Brook, BW and England, MH and Fogwill, CJ and Jones, RT and Palmer, J and Hughen, KA and Cooper, A, Obliquity-driven expansion of North Atlantic sea ice during the last glacial, Geophysical Research Letters, 42, (23) pp. 10382-10390. ISSN 0094-8276 (2015) [Refereed Article]


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Copyright Statement

Copyright 2015 American Geophysical Union

DOI: doi:10.1002/2015GL066344

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:paleoclimate, Arctic, climate change
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Climatology (excl. Climate Change Processes)
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Variability (excl. Social Impacts)
Author:Brook, BW (Professor Barry Brook)
ID Code:107175
Year Published:2015
Web of Science® Times Cited:5
Deposited By:Plant Science
Deposited On:2016-03-07
Last Modified:2017-10-30
Downloads:8 View Download Statistics

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