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Vegetation and climate during Weichselian ice free intervals in northern Sweden: Interpretations from fossil and modern pollen records
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Responsible organisation
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis the Weichselian history of northern Sweden is investigated, with emphasis on vegetation and climate during ice-free intervals. The main method used has been pollen analysis of sediments from pre-Late Weichselian landforms. To interpret fossil pollen assemblages, comparisons with modern pollen spectra were made. Modern pollen data were retrieved through monitoring of annual pollen deposition at seven sites in northern Sweden, from the boreal forest to above the present forest-line of birch. Eight years of pollen monitoring is described and put in a larger context through comparison with monitoring data from Iceland, Svalbard, Norway and Finland. A study of sediment cores from the Riipiharju esker shows evidence of two ice free phases during the Weichselian glacial; Tärendö I and Tärendö II. The Tärendö II ice free interval includes large climatic shifts, previously not recognized, from relatively warm conditions with Betula as the dominating pollen taxon to cold conditions with dominance of Artemisia and Gramineae and back to warmer conditions again. Correlation alternatives of the north Swedish ice free intervals Tärendö I and II are: 1/ Brörup (MIS 5c; c. 105-93 ka BP) and Odderade (MIS 5a; c. 85-74 ka BP), respectively, or 2/ Odderade and early Middle Weichselian time (MIS 3; c. 59-40 ka BP). Of these, alternative 2 is regarded as the most likely. Interstadial sediments deposited in a Veiki moraine plateau during downwasting of a pre-Late Weichselian ice sheet include only Betula dominant pollen spectra, showing that the climate during formation of the Veiki moraine was relatively warm. According to stratigraphical correlation there are three possible alternatives for Veiki moraine formation. Either it was formed during 1/ early Tärendö I, 2/ early Tärendö II, or 3/ late Tärendö II. Alternative 3 implies growth of an intermediate ice sheet reaching the eastern limit of Veiki moraine distribution during the cold phase of Tärendö II.

Place, publisher, year, edition, pages
Stockholm: Institutionen för naturgeografi och kvartärgeologi , 2008. , 120 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 15
Keyword [en]
Weichselian, interstadial, stadial, glacial history, northern Sweden, Tärendö, Riipiharju, Rissejauratj, Veiki moraine, pollen analysis, pollen deposition, pollen trap, PAR
National Category
Geology
Identifiers
URN: urn:nbn:se:su:diva-8222ISBN: 978-91-7155-744-5 (print)OAI: oai:DiVA.org:su-8222DiVA: diva2:199844
Public defence
2008-10-24, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 13:00
Opponent
Supervisors
Available from: 2008-10-02 Created: 2008-09-26Bibliographically approved
List of papers
1. Weichselian ice free intervals at Riipiharju, northern Sweden: interpretations of vegetation and climate from fossil and modern pollen records
Open this publication in new window or tab >>Weichselian ice free intervals at Riipiharju, northern Sweden: interpretations of vegetation and climate from fossil and modern pollen records
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25496 (URN)
Note
Part of urn:nbn:se:su:diva-8222Available from: 2008-10-02 Created: 2008-09-26 Last updated: 2010-01-13Bibliographically approved
2. Weichselian interstadial pollen stratigraphy from a Veiki plateau at Rissejauratj in Norrbotten, northern Sweden
Open this publication in new window or tab >>Weichselian interstadial pollen stratigraphy from a Veiki plateau at Rissejauratj in Norrbotten, northern Sweden
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25497 (URN)
Note
Part of urn:nbn:se:su:diva-8222Available from: 2008-10-02 Created: 2008-09-26 Last updated: 2010-01-13Bibliographically approved
3. Eight years of annual pollen monitoring in northern Sweden, from the boreal forest to above the forest-line of birch
Open this publication in new window or tab >>Eight years of annual pollen monitoring in northern Sweden, from the boreal forest to above the forest-line of birch
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25498 (URN)
Note
Part of urn:nbn:se:su:diva-8222Available from: 2008-10-02 Created: 2008-09-26 Last updated: 2010-01-13Bibliographically approved
4. Modern pollen accumulation rates at the north-western fringe of the European boreal forest
Open this publication in new window or tab >>Modern pollen accumulation rates at the north-western fringe of the European boreal forest
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25499 (URN)
Note
Part of urn:nbn:se:su:diva-8222Available from: 2008-10-02 Created: 2008-09-26 Last updated: 2010-01-13Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
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  • Other style
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  • de-DE
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Output format
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