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Vegetation and clim...
Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records
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- Hättestrand, Martina, 1968- (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Robertsson, Ann-Marie, Docent (preses)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Magri, Donatella, Associate professor (opponent)
- Dipartimento di Biologia Vegetale, Università "La Sapienza", Rome
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(creator_code:org_t)
- ISBN 9789171557445
- Stockholm : Institutionen för naturgeografi och kvartärgeologi, 2008
- Engelska 120 s.
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Serie: Dissertations from the Department of Physical Geography and Quaternary Geology, 1653-7211 ; 15
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Weichselian
- interstadial
- stadial
- glacial history
- northern Sweden
- Tärendö
- Riipiharju
- Rissejauratj
- Veiki moraine
- pollen analysis
- pollen deposition
- pollen trap
- PAR
- Quaternary geology
- Kvartärgeologi
Publikations- och innehållstyp
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