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Modest summer temperature variability during DO cycles in western Europe - an answer to a long time paradox?
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi och kvartärgeologi (INK).
Vise andre og tillknytning
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Manuskript (Annet vitenskapelig)
Identifikatorer
URN: urn:nbn:se:su:diva-25540OAI: oai:DiVA.org:su-25540DiVA, id: diva2:199924
Merknad
Part of urn:nbn:se:su:diva-8259Tilgjengelig fra: 2008-10-23 Laget: 2008-10-10 Sist oppdatert: 2010-01-13bibliografisk kontrollert
Inngår i avhandling
1. Dansgaard-Oeschger cycles and Heinrich events in western Europe - A diatom perspective
Åpne denne publikasjonen i ny fane eller vindu >>Dansgaard-Oeschger cycles and Heinrich events in western Europe - A diatom perspective
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Institutionen för naturgeografi och kvartärgeologi, 2008
Serie
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 16
Emneord
Dansgaard-Oescher cycles, Heinrich events, MIS 3 and 2, diatoms, Les Echets, France
HSV kategori
Forskningsprogram
kvartärgeologi
Identifikatorer
urn:nbn:se:su:diva-8259 (URN)978-91-7155-758-2 (ISBN)
Disputas
2008-11-14, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 13:00
Opponent
Veileder
Tilgjengelig fra: 2008-10-23 Laget: 2008-10-10bibliografisk kontrollert

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