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dc.contributor.authorTurney, C.en
dc.contributor.authorThomas, Z.en
dc.contributor.authorHutchinson, D.en
dc.contributor.authorBradshaw, C.en
dc.contributor.authorBrook, B.en
dc.contributor.authorEngland, M.en
dc.contributor.authorFogwill, C.en
dc.contributor.authorJones, R.en
dc.contributor.authorPalmer, J.en
dc.contributor.authorHughen, K.en
dc.contributor.authorCooper, A.en
dc.identifier.citationGeophysical Research Letters, 2015; 42(23):10382-10390en
dc.description.abstractNorth 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.en
dc.description.statementofresponsibilityChris 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 Cooperen
dc.publisherAmerican Geophysical Union (AGU)en
dc.rights© 2015 American Geophysical Union. All Rights Reserved.en
dc.subjectLate Pleistocene; abrupt climate change; geochronology; tipping point; meridional overturning circulation; Greenland ice coresen
dc.titleObliquity-driven expansion of North Atlantic sea ice during the last glacialen
dc.typeJournal articleen
pubs.library.collectionEcology, Evolution and Landscape Science publicationsen
dc.identifier.orcidBradshaw, C. [0000-0002-5328-7741]en
dc.identifier.orcidCooper, A. [0000-0002-7738-7851]en
Appears in Collections:Ecology, Evolution and Landscape Science publications

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