Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records
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 moder...
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Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK)
2008
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ftstockholmuniv:oai:DiVA.org:su-8222 2023-05-15T16:40:50+02:00 Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records Hättestrand, Martina 2008 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8222 eng eng Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) Stockholm : Institutionen för naturgeografi och kvartärgeologi Dissertations from the Department of Physical Geography and Quaternary Geology, 1653-7211 15 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8222 urn:isbn:978-91-7155-744-5 info:eu-repo/semantics/openAccess Weichselian interstadial stadial glacial history northern Sweden Tärendö Riipiharju Rissejauratj Veiki moraine pollen analysis pollen deposition pollen trap PAR Quaternary geology Kvartärgeologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2008 ftstockholmuniv 2023-02-23T21:38:45Z 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. Doctoral or Postdoctoral Thesis Ice Sheet Iceland Northern Sweden Svalbard Stockholm University: Publications (DiVA) Norway Svalbard Tärendö ENVELOPE(22.637,22.637,67.151,67.151) Veiki ENVELOPE(20.517,20.517,67.333,67.333) |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Weichselian interstadial stadial glacial history northern Sweden Tärendö Riipiharju Rissejauratj Veiki moraine pollen analysis pollen deposition pollen trap PAR Quaternary geology Kvartärgeologi |
spellingShingle |
Weichselian interstadial stadial glacial history northern Sweden Tärendö Riipiharju Rissejauratj Veiki moraine pollen analysis pollen deposition pollen trap PAR Quaternary geology Kvartärgeologi Hättestrand, Martina Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records |
topic_facet |
Weichselian interstadial stadial glacial history northern Sweden Tärendö Riipiharju Rissejauratj Veiki moraine pollen analysis pollen deposition pollen trap PAR Quaternary geology Kvartärgeologi |
description |
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. |
format |
Doctoral or Postdoctoral Thesis |
author |
Hättestrand, Martina |
author_facet |
Hättestrand, Martina |
author_sort |
Hättestrand, Martina |
title |
Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records |
title_short |
Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records |
title_full |
Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records |
title_fullStr |
Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records |
title_full_unstemmed |
Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records |
title_sort |
vegetation and climate during weichselian ice free intervals in northern sweden : interpretations from fossil and modern pollen records |
publisher |
Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) |
publishDate |
2008 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8222 |
long_lat |
ENVELOPE(22.637,22.637,67.151,67.151) ENVELOPE(20.517,20.517,67.333,67.333) |
geographic |
Norway Svalbard Tärendö Veiki |
geographic_facet |
Norway Svalbard Tärendö Veiki |
genre |
Ice Sheet Iceland Northern Sweden Svalbard |
genre_facet |
Ice Sheet Iceland Northern Sweden Svalbard |
op_relation |
Dissertations from the Department of Physical Geography and Quaternary Geology, 1653-7211 15 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8222 urn:isbn:978-91-7155-744-5 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766031265137426432 |