History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden
<p>The prospect of alarming levels of future sea level rise in response to the melting of the Antarctic and Greenland ice sheets affirms an urgency to better understand the dynamics of these retreating ice sheets. The history and dynamics of the ephemeral ice sheets of the Northern Hemisphere,...
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Copernicus Publications
2025-01-01
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| Series: | The Cryosphere |
| Online Access: | https://tc.copernicus.org/articles/19/347/2025/tc-19-347-2025.pdf |
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| author | K. Ploeg K. Ploeg K. Ploeg A. P. Stroeven A. P. Stroeven |
| author_facet | K. Ploeg K. Ploeg K. Ploeg A. P. Stroeven A. P. Stroeven |
| author_sort | K. Ploeg |
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| description | <p>The prospect of alarming levels of future sea level rise in response to the melting of the Antarctic and Greenland ice sheets affirms an urgency to better understand the dynamics of these retreating ice sheets. The history and dynamics of the ephemeral ice sheets of the Northern Hemisphere, such as the Fennoscandian Ice Sheet, reconstructed from glacial geomorphology, can thus serve as a useful analogue. The recent release of a 1 <span class="inline-formula">m</span> lidar-derived national elevation model reveals an unprecedented record of the glacial geomorphology in Sweden. This study aims to offer new insights and precision regarding ice retreat in the Torneträsk region of northwestern Sweden and the influence of ice-dammed lakes and faulting on the dynamics of the ice sheet margin during deglaciation. Using an inversion model, mapped glacial landforms are ordered in swarms representing spatially and temporally coherent ice sheet flow systems. Ice-dammed lake traces such as raised shorelines, perched deltas, spillways, and outlet channels are particularly useful for pinpointing precise locations of ice margins. A strong topographic control on retreat patterns is evident, from ice sheet disintegration into separate lobes in the mountains to orderly retreat in low-relief areas. Eight ice-dammed lake stages are outlined for the Torneträsk Basin, the lowest of which yields lake extents more extensive than previously identified. The three youngest stages released a total of 26 <span class="inline-formula">km<sup>3</sup></span> of meltwater as glacial lake outburst floods (GLOFs) through Tornedalen, changing the valley morphology and depositing thick deltaic sequences in Ancylus Lake at its highest postglacial shoreline at around 10 ka cal BP. The Pärvie Fault, the longest-known glacially induced fault in Sweden, offsets the six oldest lake stages in the Torneträsk Basin. Cross-cutting relationships between glacial landforms and fault scarp segments are indicative of the Pärvie Fault rupturing multiple times during the last deglaciation. Precise dating of the two bracketing raised shorelines or the ages of the corresponding GLOF sediments would pinpoint the age of this rupture of the Pärvie Fault. Collectively, this study provides data for better understanding the history and dynamics of the Fennoscandian Ice Sheet during final retreat, such as interactions with ice-dammed lakes and reactivation of faults through glacially induced stress.</p> |
| format | Article |
| id | doaj-art-b747d06facbd44ae88d8ccc7aaec6e33 |
| institution | Kabale University |
| issn | 1994-0416 1994-0424 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Copernicus Publications |
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| series | The Cryosphere |
| spelling | doaj-art-b747d06facbd44ae88d8ccc7aaec6e332025-01-28T07:17:17ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242025-01-011934737310.5194/tc-19-347-2025History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern SwedenK. Ploeg0K. Ploeg1K. Ploeg2A. P. Stroeven3A. P. Stroeven4Department of Physical Geography, Stockholm University, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, Stockholm, Swedennow at: Department of Earth Science, University of Bergen, Bergen, NorwayDepartment of Physical Geography, Stockholm University, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, Stockholm, Sweden<p>The prospect of alarming levels of future sea level rise in response to the melting of the Antarctic and Greenland ice sheets affirms an urgency to better understand the dynamics of these retreating ice sheets. The history and dynamics of the ephemeral ice sheets of the Northern Hemisphere, such as the Fennoscandian Ice Sheet, reconstructed from glacial geomorphology, can thus serve as a useful analogue. The recent release of a 1 <span class="inline-formula">m</span> lidar-derived national elevation model reveals an unprecedented record of the glacial geomorphology in Sweden. This study aims to offer new insights and precision regarding ice retreat in the Torneträsk region of northwestern Sweden and the influence of ice-dammed lakes and faulting on the dynamics of the ice sheet margin during deglaciation. Using an inversion model, mapped glacial landforms are ordered in swarms representing spatially and temporally coherent ice sheet flow systems. Ice-dammed lake traces such as raised shorelines, perched deltas, spillways, and outlet channels are particularly useful for pinpointing precise locations of ice margins. A strong topographic control on retreat patterns is evident, from ice sheet disintegration into separate lobes in the mountains to orderly retreat in low-relief areas. Eight ice-dammed lake stages are outlined for the Torneträsk Basin, the lowest of which yields lake extents more extensive than previously identified. The three youngest stages released a total of 26 <span class="inline-formula">km<sup>3</sup></span> of meltwater as glacial lake outburst floods (GLOFs) through Tornedalen, changing the valley morphology and depositing thick deltaic sequences in Ancylus Lake at its highest postglacial shoreline at around 10 ka cal BP. The Pärvie Fault, the longest-known glacially induced fault in Sweden, offsets the six oldest lake stages in the Torneträsk Basin. Cross-cutting relationships between glacial landforms and fault scarp segments are indicative of the Pärvie Fault rupturing multiple times during the last deglaciation. Precise dating of the two bracketing raised shorelines or the ages of the corresponding GLOF sediments would pinpoint the age of this rupture of the Pärvie Fault. Collectively, this study provides data for better understanding the history and dynamics of the Fennoscandian Ice Sheet during final retreat, such as interactions with ice-dammed lakes and reactivation of faults through glacially induced stress.</p>https://tc.copernicus.org/articles/19/347/2025/tc-19-347-2025.pdf |
| spellingShingle | K. Ploeg K. Ploeg K. Ploeg A. P. Stroeven A. P. Stroeven History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden The Cryosphere |
| title | History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden |
| title_full | History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden |
| title_fullStr | History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden |
| title_full_unstemmed | History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden |
| title_short | History and dynamics of Fennoscandian Ice Sheet retreat, contemporary ice-dammed lake evolution, and faulting in the Torneträsk area, northwestern Sweden |
| title_sort | history and dynamics of fennoscandian ice sheet retreat contemporary ice dammed lake evolution and faulting in the tornetrask area northwestern sweden |
| url | https://tc.copernicus.org/articles/19/347/2025/tc-19-347-2025.pdf |
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