Menu

Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Ice-dammed lakes and rerouting of the drainage of northern Eurasia during the Last Glaciation

Author:
  • J Mangerud
  • M Jakobsson
  • Helena Alexanderson
  • V Astakhov
  • GKC Clarke
  • M Henriksen
  • Christian Hjort
  • G Krinner
  • JP Lunkka
  • Per Möller
  • A Murray
  • O Nikolskaya
  • M Saarnisto
  • JI Svendsen
Publishing year: 2004
Language: English
Pages: 1313-1332
Publication/Series: Quaternary Science Reviews
Volume: 23
Issue: 11-13
Document type: Journal article
Publisher: Elsevier

Abstract english

During the Quaternary period, ice sheets centred over the Barents and Kara seas expanded several times onto mainland Russia and blocked northflowing rivers, such as the Yenissei, Ob, Pechora and Mezen. Large ice-dammed lakes with reversed outlets, e.g. toward the Caspian Sea, formed south of these ice sheets. Some lakes are reconstructed from shorelines and lacustrine sediments, others mainly from ice-sheet configuration. Ice-dammed lakes, considerably larger than any lake on Earth today, are reconstructed for the periods 90-80 and 60-50 ka. The ages are based on numerous optically stimulated luminescence (OSL) dates. During the global Last Glacial Maximum (LGM, about 20 ka) the Barents-Kara Ice Sheet was too small to block these eastern rivers, although in contrast to the 90-80 and 60-50 ka maxima, the Scandinavian Ice Sheet grew large enough to divert rivers and meltwater across the drainage divide from the Baltic Basin to the River Volga, and that way to the Caspian Sea. Climate modelling shows that the lakes caused lower summer temperatures on the continent and on the lower parts of the ice sheet. The final drainage of the best mapped lake is modelled, and it is concluded that it probably emptied within few months. We predict that this catastrophic outburst had considerable impact on sea-ice formation in the Arctic Ocean and on the climate of a much larger area. (C) 2003 Elsevier Ltd. All rights reserved.

Keywords

  • Geology

Other

Published
  • ISSN: 0277-3791
Helena Alexandersson
E-mail: helena [dot] alexanderson [at] geol [dot] lu [dot] se

Professor

Quaternary Sciences

+46 46 222 44 83

435

16

Aeolian sand project

Project members
Members of the aeolian sand project: Martin Bernhardson, Sara Florén, Edyta Kalińska-Nartiša and Helena Alexanderson.

Read more about the project here.