Change search
ReferencesLink to record
Permanent link

Direct link
Modest summer temperature variability during DO cycles in western Europe - an answer to a long time paradox?
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Show others and affiliations
Responsible organisation
Manuscript (Other academic)
URN: urn:nbn:se:su:diva-25540OAI: diva2:199924
Part of urn:nbn:se:su:diva-8259Available from: 2008-10-23 Created: 2008-10-10 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Dansgaard-Oeschger cycles and Heinrich events in western Europe - A diatom perspective
Open this publication in new window or tab >>Dansgaard-Oeschger cycles and Heinrich events in western Europe - A diatom perspective
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The last glacial period was characterised by several abrupt climatic shifts referred to as Dansgaard-Oeschger (DO) cycles and Heinrich events. These shifts were most frequent between 60,000 and 20,000 years before present coinciding with Marine Isotope Stages (MIS) 3 and 2. DO cycles and Heinrich events have been most thoroughly investigated in marine and ice core records while their impact on terrestrial environments is less well known. The high-resolution, multi-proxy investigation of a long sediment sequence, obtained from the former lake at Les Echets in France, aims at filling this gap and allows determining the impact of these climatic events on the lake and its catchment. The site and its surroundings experienced distinct shifts in lake organic productivity and catchment conditions as a consequence of DO climate variability and Heinrich events. The detailed analysis of the fossil diatom record shows distinct changes in diatom productivity, diversity and community composition, which are most likely due to variations in the length of lake ice cover, thermal stratification regimes and catchment conditions during a DO cycle. The distinct reduction in lake organic productivity and particularly low concentrations of diatom valves during intervals corresponding to Heinrich events suggest that these cold and arid phases had the most severe impact on the paleolake at Les Echets. The results of this thesis provide new insight into the impact of abrupt climate change on lacustrine ecosystems and show the potential of high-resolution and multi-proxy studies in paleoenvironmental research.

Place, publisher, year, edition, pages
Stockholm: Institutionen för naturgeografi och kvartärgeologi, 2008
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 16
Dansgaard-Oescher cycles, Heinrich events, MIS 3 and 2, diatoms, Les Echets, France
National Category
Research subject
Quarternary Geology
urn:nbn:se:su:diva-8259 (URN)978-91-7155-758-2 (ISBN)
Public defence
2008-11-14, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 13:00
Available from: 2008-10-23 Created: 2008-10-10Bibliographically approved

Open Access in DiVA

No full text

By organisation
Department of Physical Geography and Quaternary Geology

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: 36 hits
ReferencesLink to record
Permanent link

Direct link