Mountain centered icefields in northern Scandinavia
Mountain centered glaciers have played a major role throughout the last three million years in the Scandinavian mountains. The climatic extremes, like the present warm interglacial or cold glacial maxima, are very short-lived compared to the periods of intermediate climate conditions, characterized...
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Institutionen för naturgeografi och kvartärgeologi (INK)
2004
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ftstockholmuniv:oai:DiVA.org:su-131 2023-05-15T16:40:30+02:00 Mountain centered icefields in northern Scandinavia Fredin, Ola 2004 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131 eng eng Institutionen för naturgeografi och kvartärgeologi (INK) Stockholm : Institutionen för naturgeografi och kvartärgeologi Avhandling i geografi med naturgeografisk inriktning, 1650-4992 29 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131 urn:isbn:91-7265-877-0 info:eu-repo/semantics/openAccess Scandinavia Quaternary Weichselian mountain icefield ice sheet Physical Geography Naturgeografi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2004 ftstockholmuniv 2023-02-23T21:39:30Z Mountain centered glaciers have played a major role throughout the last three million years in the Scandinavian mountains. The climatic extremes, like the present warm interglacial or cold glacial maxima, are very short-lived compared to the periods of intermediate climate conditions, characterized by the persistence of mountain based glaciers and ice fields of regional size. These have persisted in the Scandinavian mountains for about 65% of the Quaternary. Mountain based glaciers thus had a profound impact on large-scale geomorphology, which is manifested in large-scale glacial landforms such as fjords, glacial lakes and U-shaped valleys in and close to the mountain range. Through a mapping of glacial landforms in the northern Scandinavian mountain range, in particular a striking set of lateral moraines, this thesis offers new insights into Weichselian stages predating the last glacial maximum. The aerial photograph mapping and field evidence yield evidence that these lateral moraines were overridden by glacier ice subsequent to their formation. The lateral moraines were dated using terrestrial cosmogenic nuclide techniques. Although the terrestrial cosmogenic nuclide signature of the moraines is inconclusive, an early Weichselian age is tentatively suggested through correlations with other landforms and stratigraphical archives in the region. The abundance and coherent spatial pattern of the lateral moraines also allow a spatial reconstruction of this ice field. The ice field was controlled by topography and had nunataks protruding also where it was thickest close to the elevation axis of the Scandinavian mountain range. Outlet glaciers discharged into the Norwegian fjords and major valleys in Sweden. The process by which mountain based glaciers grow into an ice sheet is a matter of debate. In this thesis, a feedback mechanism between debris on the ice surface and ice sheet growth is presented. In essence, the growth of glaciers and ice sheets may be accelerated by an abundance of debris in their ablation ... Doctoral or Postdoctoral Thesis Ice Sheet Stockholm University: Publications (DiVA) |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Scandinavia Quaternary Weichselian mountain icefield ice sheet Physical Geography Naturgeografi |
spellingShingle |
Scandinavia Quaternary Weichselian mountain icefield ice sheet Physical Geography Naturgeografi Fredin, Ola Mountain centered icefields in northern Scandinavia |
topic_facet |
Scandinavia Quaternary Weichselian mountain icefield ice sheet Physical Geography Naturgeografi |
description |
Mountain centered glaciers have played a major role throughout the last three million years in the Scandinavian mountains. The climatic extremes, like the present warm interglacial or cold glacial maxima, are very short-lived compared to the periods of intermediate climate conditions, characterized by the persistence of mountain based glaciers and ice fields of regional size. These have persisted in the Scandinavian mountains for about 65% of the Quaternary. Mountain based glaciers thus had a profound impact on large-scale geomorphology, which is manifested in large-scale glacial landforms such as fjords, glacial lakes and U-shaped valleys in and close to the mountain range. Through a mapping of glacial landforms in the northern Scandinavian mountain range, in particular a striking set of lateral moraines, this thesis offers new insights into Weichselian stages predating the last glacial maximum. The aerial photograph mapping and field evidence yield evidence that these lateral moraines were overridden by glacier ice subsequent to their formation. The lateral moraines were dated using terrestrial cosmogenic nuclide techniques. Although the terrestrial cosmogenic nuclide signature of the moraines is inconclusive, an early Weichselian age is tentatively suggested through correlations with other landforms and stratigraphical archives in the region. The abundance and coherent spatial pattern of the lateral moraines also allow a spatial reconstruction of this ice field. The ice field was controlled by topography and had nunataks protruding also where it was thickest close to the elevation axis of the Scandinavian mountain range. Outlet glaciers discharged into the Norwegian fjords and major valleys in Sweden. The process by which mountain based glaciers grow into an ice sheet is a matter of debate. In this thesis, a feedback mechanism between debris on the ice surface and ice sheet growth is presented. In essence, the growth of glaciers and ice sheets may be accelerated by an abundance of debris in their ablation ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Fredin, Ola |
author_facet |
Fredin, Ola |
author_sort |
Fredin, Ola |
title |
Mountain centered icefields in northern Scandinavia |
title_short |
Mountain centered icefields in northern Scandinavia |
title_full |
Mountain centered icefields in northern Scandinavia |
title_fullStr |
Mountain centered icefields in northern Scandinavia |
title_full_unstemmed |
Mountain centered icefields in northern Scandinavia |
title_sort |
mountain centered icefields in northern scandinavia |
publisher |
Institutionen för naturgeografi och kvartärgeologi (INK) |
publishDate |
2004 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Avhandling i geografi med naturgeografisk inriktning, 1650-4992 29 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131 urn:isbn:91-7265-877-0 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766030894853783552 |