Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway
Understanding past responses of ice sheets to climate change provides an important long‐term context for observations of present day, and projected future, ice‐sheet change. In this work, we reconstruct the deglaciation of the marine‐terminating western margin of the Scandinavian Ice Sheet in the ou...
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Online Access: | http://dx.doi.org/10.1111/bor.12568 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12568 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12568 |
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crwiley:10.1111/bor.12568 2024-09-09T19:44:41+00:00 Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway Regnéll, Carl Briner, Jason P. Haflidason, Haflidi Mangerud, Jan Svendsen, John Inge 2021 http://dx.doi.org/10.1111/bor.12568 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12568 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12568 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Boreas volume 51, issue 2, page 255-273 ISSN 0300-9483 1502-3885 journal-article 2021 crwiley https://doi.org/10.1111/bor.12568 2024-06-18T04:16:13Z Understanding past responses of ice sheets to climate change provides an important long‐term context for observations of present day, and projected future, ice‐sheet change. In this work, we reconstruct the deglaciation of the marine‐terminating western margin of the Scandinavian Ice Sheet in the outer Hardangerfjorden area of southwestern Norway, following the Last Glacial Maximum (LGM) until the start of the Holocene. We base our interpretations on a combination of geomorphological mapping using high‐resolution (LiDAR) terrain models, 68 new cosmogenic nuclide 10 Be exposure ages and radiocarbon‐dated lake sediment cores, supported by the stratigraphic position of the 12.1 ka Vedde Ash. We show that even the highest mountain summits in the area (~1200–1400 m a.s.l.) were ice‐covered during the LGM, thus settling debates concerning the Scandinavian Ice Sheet thickness in this region. These summits emerged as nunataqs through the ice sheet about 22–18 ka, potentially owing to upstream ice thinning caused by the break‐up and retreat of the Norwegian Channel Ice Stream. Following the break‐up of the Norwegian Channel Ice Stream, the ice margin seemingly stabilized at the outermost coast for 3500–5500 years before the mouth of Hardangerfjorden became ice free at c . 14.5 ka. Subsequently, during the Bølling and Allerød periods, the ice sheet retreated rapidly into the inner parts of Hardangerfjorden before a major ice sheet re‐advance during the Younger Dryas. We identify and reconstruct a sizeable, independent ice cap on the Ulvanosa mountain massif during the Younger Dryas (YD), a massif that earlier was mapped as covered by the Scandinavian Ice Sheet during the YD. We also document ice‐free areas that are more extensive than previously thought between Hardangerfjorden and Matersfjorden during the YD. Article in Journal/Newspaper Ice cap Ice Sheet Wiley Online Library Norway Boreas |
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English |
description |
Understanding past responses of ice sheets to climate change provides an important long‐term context for observations of present day, and projected future, ice‐sheet change. In this work, we reconstruct the deglaciation of the marine‐terminating western margin of the Scandinavian Ice Sheet in the outer Hardangerfjorden area of southwestern Norway, following the Last Glacial Maximum (LGM) until the start of the Holocene. We base our interpretations on a combination of geomorphological mapping using high‐resolution (LiDAR) terrain models, 68 new cosmogenic nuclide 10 Be exposure ages and radiocarbon‐dated lake sediment cores, supported by the stratigraphic position of the 12.1 ka Vedde Ash. We show that even the highest mountain summits in the area (~1200–1400 m a.s.l.) were ice‐covered during the LGM, thus settling debates concerning the Scandinavian Ice Sheet thickness in this region. These summits emerged as nunataqs through the ice sheet about 22–18 ka, potentially owing to upstream ice thinning caused by the break‐up and retreat of the Norwegian Channel Ice Stream. Following the break‐up of the Norwegian Channel Ice Stream, the ice margin seemingly stabilized at the outermost coast for 3500–5500 years before the mouth of Hardangerfjorden became ice free at c . 14.5 ka. Subsequently, during the Bølling and Allerød periods, the ice sheet retreated rapidly into the inner parts of Hardangerfjorden before a major ice sheet re‐advance during the Younger Dryas. We identify and reconstruct a sizeable, independent ice cap on the Ulvanosa mountain massif during the Younger Dryas (YD), a massif that earlier was mapped as covered by the Scandinavian Ice Sheet during the YD. We also document ice‐free areas that are more extensive than previously thought between Hardangerfjorden and Matersfjorden during the YD. |
format |
Article in Journal/Newspaper |
author |
Regnéll, Carl Briner, Jason P. Haflidason, Haflidi Mangerud, Jan Svendsen, John Inge |
spellingShingle |
Regnéll, Carl Briner, Jason P. Haflidason, Haflidi Mangerud, Jan Svendsen, John Inge Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway |
author_facet |
Regnéll, Carl Briner, Jason P. Haflidason, Haflidi Mangerud, Jan Svendsen, John Inge |
author_sort |
Regnéll, Carl |
title |
Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway |
title_short |
Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway |
title_full |
Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway |
title_fullStr |
Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway |
title_full_unstemmed |
Deglaciation of the Scandinavian Ice Sheet and a Younger Dryas ice cap in the outer Hardangerfjorden area, southwestern Norway |
title_sort |
deglaciation of the scandinavian ice sheet and a younger dryas ice cap in the outer hardangerfjorden area, southwestern norway |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/bor.12568 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12568 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12568 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Ice cap Ice Sheet |
genre_facet |
Ice cap Ice Sheet |
op_source |
Boreas volume 51, issue 2, page 255-273 ISSN 0300-9483 1502-3885 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/bor.12568 |
container_title |
Boreas |
_version_ |
1809914331661336576 |