Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE
To improve knowledge of marine-terminating glaciers in western Greenland, marine sediment cores from the Ata Sund fjord system, hosting two outlet glaciers, Eqip Sermia and Kangilerngata Sermia, were investigated. The main objective was to reconstruct glacial activity and paleoceanographic condition...
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Online Access: | https://hdl.handle.net/11250/2766472 https://doi.org/10.1177/0959683620950431 |
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ftunivbergen:oai:bora.uib.no:11250/2766472 2023-05-15T16:01:04+02:00 Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE Ekblom Johansson, Fanny Maria Wangner, David J Bakke, Jostein Snowman Andresen, Camilla Støren, Eivind Wilhelm Nagel Schmidt, Sabine Vieli, Andreas 2020 application/pdf https://hdl.handle.net/11250/2766472 https://doi.org/10.1177/0959683620950431 eng eng Sage Norges forskningsråd: 267719 urn:issn:0959-6836 https://hdl.handle.net/11250/2766472 https://doi.org/10.1177/0959683620950431 cristin:1833732 The Holocene. 2020, 30(12), 1681-1693 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors The Holocene 1681-1693 30 12 VDP::Kvartærgeologi glasiologi: 465 VDP::Quaternary geology glaciology: 465 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1177/0959683620950431 2023-03-14T17:45:00Z To improve knowledge of marine-terminating glaciers in western Greenland, marine sediment cores from the Ata Sund fjord system, hosting two outlet glaciers, Eqip Sermia and Kangilerngata Sermia, were investigated. The main objective was to reconstruct glacial activity and paleoceanographic conditions during the past 600 years. Ice-rafted debris (IRD) was quantified by wet-sieving sediment samples and by using a computed tomography scan. Variability in relative bottom water temperatures in the fjord was reconstructed using foraminiferal analysis. On the basis of this, three periods of distinct glacial regimes were identified: Period 1 (1380–1810 CE), which covers the culmination of the Little Ice Age (LIA) and is interpreted as having advanced glaciers with high IRD content. Period 2 (1810–1920 CE), the end of the LIA, which was characterised by a lowering of the glaciers’ calving flux in response to climate cooling. During Period 3 (1920–2014 CE), both glaciers retreated substantially to their present-day extent. The bottom water temperature started to decrease just before Period 2 and remained relatively low until just before the end of Period 3. This is interpreted as a local response to increased glacial meltwater input. Our study was compared with a study in Disko Bay, nearby Jakobshavn Glacier and the result shows that both of these Greenlandic marine-terminating glaciers are responding to large-scale climate change. However, the specific imprint on the glaciers and the different fjord waters in front of them result in contrasting glacial responses and sediment archives in their respective fjords. publishedVersion Article in Journal/Newspaper Disko Bay glacier Greenland greenlandic Jakobshavn University of Bergen: Bergen Open Research Archive (BORA-UiB) Eqip Sermia ENVELOPE(-50.067,-50.067,69.817,69.817) Greenland Kangilerngata Sermia ENVELOPE(-50.133,-50.133,69.933,69.933) Sund ENVELOPE(13.644,13.644,66.207,66.207) The Holocene 30 12 1681 1693 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Kvartærgeologi glasiologi: 465 VDP::Quaternary geology glaciology: 465 |
spellingShingle |
VDP::Kvartærgeologi glasiologi: 465 VDP::Quaternary geology glaciology: 465 Ekblom Johansson, Fanny Maria Wangner, David J Bakke, Jostein Snowman Andresen, Camilla Støren, Eivind Wilhelm Nagel Schmidt, Sabine Vieli, Andreas Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE |
topic_facet |
VDP::Kvartærgeologi glasiologi: 465 VDP::Quaternary geology glaciology: 465 |
description |
To improve knowledge of marine-terminating glaciers in western Greenland, marine sediment cores from the Ata Sund fjord system, hosting two outlet glaciers, Eqip Sermia and Kangilerngata Sermia, were investigated. The main objective was to reconstruct glacial activity and paleoceanographic conditions during the past 600 years. Ice-rafted debris (IRD) was quantified by wet-sieving sediment samples and by using a computed tomography scan. Variability in relative bottom water temperatures in the fjord was reconstructed using foraminiferal analysis. On the basis of this, three periods of distinct glacial regimes were identified: Period 1 (1380–1810 CE), which covers the culmination of the Little Ice Age (LIA) and is interpreted as having advanced glaciers with high IRD content. Period 2 (1810–1920 CE), the end of the LIA, which was characterised by a lowering of the glaciers’ calving flux in response to climate cooling. During Period 3 (1920–2014 CE), both glaciers retreated substantially to their present-day extent. The bottom water temperature started to decrease just before Period 2 and remained relatively low until just before the end of Period 3. This is interpreted as a local response to increased glacial meltwater input. Our study was compared with a study in Disko Bay, nearby Jakobshavn Glacier and the result shows that both of these Greenlandic marine-terminating glaciers are responding to large-scale climate change. However, the specific imprint on the glaciers and the different fjord waters in front of them result in contrasting glacial responses and sediment archives in their respective fjords. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ekblom Johansson, Fanny Maria Wangner, David J Bakke, Jostein Snowman Andresen, Camilla Støren, Eivind Wilhelm Nagel Schmidt, Sabine Vieli, Andreas |
author_facet |
Ekblom Johansson, Fanny Maria Wangner, David J Bakke, Jostein Snowman Andresen, Camilla Støren, Eivind Wilhelm Nagel Schmidt, Sabine Vieli, Andreas |
author_sort |
Ekblom Johansson, Fanny Maria |
title |
Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE |
title_short |
Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE |
title_full |
Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE |
title_fullStr |
Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE |
title_full_unstemmed |
Glacier and ocean variability in Ata Sund, west Greenland, since 1400 CE |
title_sort |
glacier and ocean variability in ata sund, west greenland, since 1400 ce |
publisher |
Sage |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2766472 https://doi.org/10.1177/0959683620950431 |
long_lat |
ENVELOPE(-50.067,-50.067,69.817,69.817) ENVELOPE(-50.133,-50.133,69.933,69.933) ENVELOPE(13.644,13.644,66.207,66.207) |
geographic |
Eqip Sermia Greenland Kangilerngata Sermia Sund |
geographic_facet |
Eqip Sermia Greenland Kangilerngata Sermia Sund |
genre |
Disko Bay glacier Greenland greenlandic Jakobshavn |
genre_facet |
Disko Bay glacier Greenland greenlandic Jakobshavn |
op_source |
The Holocene 1681-1693 30 12 |
op_relation |
Norges forskningsråd: 267719 urn:issn:0959-6836 https://hdl.handle.net/11250/2766472 https://doi.org/10.1177/0959683620950431 cristin:1833732 The Holocene. 2020, 30(12), 1681-1693 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors |
op_doi |
https://doi.org/10.1177/0959683620950431 |
container_title |
The Holocene |
container_volume |
30 |
container_issue |
12 |
container_start_page |
1681 |
op_container_end_page |
1693 |
_version_ |
1766397067369906176 |