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Influence of regional parameters on the surface mass balance of the Eurasian ice sheet during the peak Saalian (140 kya)
UJF, CNRS, Lab Glaciol & Geophys Environm, Paris, France..
UJF, CNRS, Lab Glaciol & Geophys Environm, Paris, France..
Stockholm Univ, Dept Geol & Geochem, S-10691 Stockholm, Sweden..
UJF, CNRS, Lab Glaciol & Geophys Environm, Paris, France..
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2009 (English)In: Global and Planetary Change, ISSN 0921-8181, E-ISSN 1872-6364, Vol. 68, no 1-2, 132-148 p.Article in journal (Refereed) Published
Abstract [en]

Recent geologically-based reconstructions of the Eurasian ice sheet show that during the peak Saalian (approximate to 140 kya) the ice sheet was larger over Eurasia than during the Last Glacial Maximum (LGM) at approximate to 21 kya. To address this problem we use the LMDZ4 atmospheric general circulation model to evaluate the impact on the Saalian ice sheet's surface mass balance (SMB) from proglacial lakes. dust deposition on snow, vegetation and sea surface temperatures (SST) since geological records suggest that these environmental parameters were different during the two glacial periods. Seven model simulations have been carried out. Dust deposition decreases the mean SMB by intensifying surface melt during summer while proglacial lakes cool the summer climate and reduce surface melt on the ice sheet. A simulation including both proglacial lakes and dust shows that the presence of the former parameter reduces the impact of the latter, in particular, during summer. A switch from needle-leaf to tundra vegetation affects the regional climate but not enough to significantly influence the SMB of the nearby ice margin. However, a steady-state vegetation in equilibrium with the climate should be computed to improve the boundary conditions for further evaluations of the vegetation impact on the ice sheet's SMB. Finally, changes of the SST broadly affect the regional climate with significant consequences for the SMB. (C) 2009 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2009. Vol. 68, no 1-2, 132-148 p.
Keyword [en]
surface mass balance, Eurasian ice sheet, Saalian, proglacial lakes, dust, SST, vegetation
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-2392DOI: 10.1016/j.gloplacha.2009.03.021ISI: 000269401100012OAI: oai:DiVA.org:polar-2392DiVA: diva2:859115
Available from: 2015-10-06 Created: 2015-10-06 Last updated: 2015-10-06

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CiteExportLink to record
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