Eurasian permafrost instability constrained by reduced sea-ice cover

In order to specify potentially causal relationships between climate, permafrost extent and sea-ice cover we apply a twofold research strategy: (1) we cover a large range of climate conditions varying from full glacial to the relatively warm climate projected for the end of the 21st Century, (2) we...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Vandenberghe, J., Renssen, H., Roche, D.M., Goosse, Hugues, Velichko, A.A., Gorbunov, A., Levavasseur, G.
Other Authors: Faculty of Earth & Life Sciences, VU University Amsterdam - Section of Climate Change and Landscape Dynamics, UCL - SST/ELI/ELIC - Earth & Climate, Russian Academy of Sciences, Moscow, Russia - Laboratory of Evolutionary, SD Russian Academy of Sciences, Almaty, Kazakhstan - Russia Permafrost Institute, Laboratoire CEA/CNRS/UVSQ, Gif-sur-Yvette, France - Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL
Format: Article in Journal/Newspaper
Language:English
Published: Pergamon 2012
Subjects:
Permafrost distribution
Artic sea-ice
Permafrost instability
LGM permafrost extent
Permafrost modelling
CECI
CISM
1443
Arctic
Global warming
Ice
North Atlantic
permafrost
Sea ice
Online Access:http://hdl.handle.net/2078.1/107212
https://doi.org/10.1016/j.quascirev.2011.12.001
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Summary:In order to specify potentially causal relationships between climate, permafrost extent and sea-ice cover we apply a twofold research strategy: (1) we cover a large range of climate conditions varying from full glacial to the relatively warm climate projected for the end of the 21st Century, (2) we combine new proxy-based reconstructions of Eurasian permafrost extent during the LGM and climate model simulations. We find that that there is a linear relationship between the winter sea-ice extent in the North Atlantic and Arctic Oceans and the latitude of the southernmost permafrost limit in Eurasia. During the LGM, extensive sea-ice cover caused a zonal permafrost distribution with the southern margin extending W-E and reaching 47°N, contrasting with the present-day NW-SE trending margin (66°-52° N). We infer that under global warming scenarios projected by climate models for the 21st Century the Arctic sea-ice cover decline will cause widespread instability of mainly discontinuous permafrost in Eurasian lowlands

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