Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/101295
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
Author: | Turney, C. Thomas, Z. Hutchinson, D. Bradshaw, C. Brook, B. England, M. Fogwill, C. Jones, R. Palmer, J. Hughen, K. Cooper, A. |
Citation: | Geophysical Research Letters, 2015; 42(23):10382-10390 |
Publisher: | American Geophysical Union (AGU) |
Issue Date: | 2015 |
ISSN: | 0094-8276 1944-8007 |
Statement of Responsibility: | Chris S. M. Turney, Zoë A. Thomas, David K. Hutchinson, Corey J.A. Bradshaw, Barry W. Brook, Matthew H. England, Christopher J. Fogwill, Richard T. Jones, Jonathan Palmer, Konrad A. Hughen, and Alan Cooper |
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 calendar 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 modelling suggests 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 these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM. |
Keywords: | Late Pleistocene; abrupt climate change; geochronology; tipping point; meridional overturning circulation; Greenland ice cores |
Rights: | © 2015 American Geophysical Union. All Rights Reserved. |
DOI: | 10.1002/2015GL066344 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1002/2015gl066344 |
Appears in Collections: | Aurora harvest 7 Ecology, Evolution and Landscape Science publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.