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Sensitivity of the Late Saalian (140 kyrs BP) and LGM (21 kyrs BP) Eurasian ice sheet surface mass balance to vegetation feedbacks
Joseph Fourier University, France.
Joseph Fourier University, France.
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2009 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 36, L08704Article in journal (Refereed) Published
Abstract [en]

This work uses an atmospheric general circulation model (AGCM) asynchronously coupled to an equilibrium vegetation model to investigate whether vegetation feedbacks could be one of the reasons why the Late Saalian ice sheet (140 kyrs BP) in Eurasia was substantially larger than the Last Glacial Maximum (LGM, 21 kyrs BP) Eurasian ice sheet. The modeled vegetation changes induce a regional cooling for the Late Saalian while they cause a slight regional warming for LGM. As a result, ablation along the margins of the Late Saalian ice sheet is significantly reduced, leading to an increased surface mass balance, while there are no significant mass balance changes observed from vegetation feedbacks at LGM.

Place, publisher, year, edition, pages
2009. Vol. 36, L08704
Keyword [en]
vegetation modeling, Late Saalian, Quaternary, climate, ice sheet, surface mass balance
National Category
Climate Research
URN: urn:nbn:se:su:diva-29299DOI: 10.1029/2009GL037200ISI: 000265534000002OAI: diva2:232269
ANR IDEGLACEExplora Doc Rohnes AlpesLavoisier Cotutelle - FranceThe Bert Bolin Centre for Climate Research
Available from: 2009-08-21 Created: 2009-08-20 Last updated: 2016-03-01Bibliographically approved
In thesis
1. On the Late Saalian glaciation: A climate modeling study
Open this publication in new window or tab >>On the Late Saalian glaciation: A climate modeling study
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the glaciation of the Late Saalian period (160 -140 ka) over Eurasia. The Quaternary Environment of the Eurasian North (QUEEN) project determined that during this period, the Eurasian ice sheet was substantially larger than during the entire Weichselian cycle and especially that of the Last Glacial Maximum (21 ka, LGM). The Late Saalian astronomical forcing was different than during the LGM while greenhouse gas concentrations were similar. To understand how this ice sheet could have grown so large over Eurasia during the Late Saalian, we use an Atmospherical General Circulation Model (AGCM) coupled to an oceanic mixed layer and a vegetation model to explore the influence of regional parameters, sea surface temperatures (SST) and orbital parameters on the surface mass balance (SMB) of the Late Saalian Eurasian ice sheet.

At140 ka, proglacial lakes, vegetation and simulated Late Saalian SST cool the Eurasian climate, which reduce the ablation along the southern ice sheet margins. Dust deposition on snow has the opposite effect. The presence of a Canada Basin ice-shelf during MIS6 in the Arctic Ocean, does not affect the mass balance of the ice sheet. According to geological evidence, the Late Saalian Eurasian ice sheet reached its maximum extent before 160 ka. Northern Hemisphere high latitude summer insolation shows a large insolation peak near 150 ka. The simulated climate prior to 140 ka is milder and ablation is larger along the southern margins of the Eurasian ice sheet although the mean annual SMB is positive. The Late Saalian Eurasian ice sheet may have been large enough to generate its own cooling, thus maintaining itself over Eurasia. 

Place, publisher, year, edition, pages
Stockholm: Department of Geology and Geochemistry, Stockholm University, 2009. 53 p.
Meddelanden från Stockholms universitets institution för geologi och geokemi, ISSN 1101-1599 ; 335
Climate modeling, Eurasian ice sheet, Quaternary, Saalian, surface mass balance, SST
National Category
Earth and Related Environmental Sciences
Research subject
Marine Geoscience
urn:nbn:se:su:diva-29284 (URN)978-91-7155-914-2 (ISBN)
Public defence
2009-09-14, Laboratoire de Glaciologie et Géophysique de l'Environnement, Université Joseph Fourier, 54 rue Moliére, St-Martin d'Héres Cedex, France, 10:00 (English)
Joint PhD Degree between Stockholm University and Université Joseph Fourier At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Submitted. Paper 4: Submitted. Paper 5: Manuscript.Available from: 2009-08-30 Created: 2009-08-20 Last updated: 2009-08-21Bibliographically approved

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Colleoni, FlorenceJaobsson, Martin
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