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The sensitivity of the Late Saalian (140 ka) and LGM (21 ka) Eurasian ice sheets to sea surface conditions
Ist Nazl Geofis & Vulcanol, Ctr Euromediterraneo Cambiamenti Climatici, Bologna, Italy.;UJF, CNRS, Lab Glaciol & Geophys Environm, St Martin Dheres, France.;Stockholm Univ, Dept Geol Sci, S-10691 Stockhlom, Sweden..ORCID-id: 0000-0003-4582-812X
Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden..
UJF, CNRS, Lab Glaciol & Geophys Environm, St Martin Dheres, France..ORCID-id: 0000-0002-2959-5920
Stockholm Univ, Dept Geol Sci, S-10691 Stockhlom, Sweden..ORCID-id: 0000-0002-9033-3559
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2011 (engelsk)Inngår i: Climate Dynamics, ISSN 0930-7575, E-ISSN 1432-0894, Vol. 37, nr 3-4, s. 531-553Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This work focuses on the Late Saalian (140 ka) Eurasian ice sheets' surface mass balance (SMB) sensitivity to changes in sea surface temperatures (SST). An Atmospheric General Circulation Model (AGCM), forced with two preexisting Last Glacial Maximum (LGM, 21 ka) SST reconstructions, is used to compute climate at 140 and 21 ka (reference glaciation). Contrary to the LGM, the ablation almost stopped at 140 ka due to the climatic cooling effect from the large ice sheet topography. Late Saalian SST are simulated using an AGCM coupled with a mixed layer ocean. Compared to the LGM, these 140 ka SST show an inter-hemispheric asymmetry caused by the larger ice-albedo feedback, cooling climate. The resulting Late Saalian ice sheet SMB is smaller due to the extensive simulated sea ice reducing the precipitation. In conclusion, SST are important for the stability and growth of the Late Saalian Eurasian ice sheet.

sted, utgiver, år, opplag, sider
2011. Vol. 37, nr 3-4, s. 531-553
Emneord [en]
Sea surface temperatures, Late Saalian, Last Glacial Maximum, Eurasian ice sheet, Climate modelling, Quaternary
Identifikatorer
URN: urn:nbn:se:polar:diva-2383DOI: 10.1007/s00382-010-0870-7ISI: 000293403500008OAI: oai:DiVA.org:polar-2383DiVA, id: diva2:859086
Tilgjengelig fra: 2015-10-06 Laget: 2015-10-06 Sist oppdatert: 2017-12-01

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