Change search
ReferencesLink to record
Permanent link

Direct link
The Late Saalian surface ocean (140 ka): sensitivity of the Late Saalian Eurasian ice sheet to sea surface conditions
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Stockholm University, Faculty of Science, Department of Meteorology .
Laboratoire de Glaciologie et Géophysique de l'Environnement - Grenoble (France).
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Show others and affiliations
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This work focuses on the Late Saalian (140 ka) and LGM (21 ka) Eurasian ice sheets surface mass balance (SMB) sensitivity to changes in sea surface temperatures (SST). Since no global Late Saalian SST compilations exist, we test the sensitivity of the Late Saalian climate using an AGCM forced with two data-based LGM SST reconstructions. Furthermore, an attempt to reconstruct the Late Saalian SST is performed using an AGCM coupled to a mixed-layer ocean. The resulting Late Saalian SST are cooler than the LGM SST in the Northern Hemisphere and warmer in the Southern. The winter sea ice extends to 40◦ N in both North Atlantic and Pacific oceans. Changes in SST affect the SMB of the Eurasian ice sheet during both glaciations although the Late Saalian ice sheet is less sensitive to the prescribed SST changes than the LGM.

Keyword [en]
Sea surface conditions, Late Saalian, Eurasian ice sheet, Climate modelling, Quaternary
National Category
Climate Research Oceanography, Hydrology, Water Resources
URN: urn:nbn:se:su:diva-29300OAI: diva2:232270
ANR IDEGLACEThe Bert Bolin Center for Climate ResearchExplora Doc (Rhones Alpes)Lavoisier Cotutelle
Available from: 2009-08-21 Created: 2009-08-20 Last updated: 2010-01-14Bibliographically 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

Open Access in DiVA

No full text

Other links

Link to doctoral thesis

Search in DiVA

By author/editor
Colleoni, FlorenceLiakka, JohanJakobsson, Martin
By organisation
Department of Geology and GeochemistryDepartment of Meteorology
Climate ResearchOceanography, Hydrology, Water Resources

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 32 hits
ReferencesLink to record
Permanent link

Direct link