The deglaciation of coastal areas of southeast Greenland
Large marine-terminating glaciers around the margins of the Greenland Ice Sheet have retreated, accelerated and thinned over the last two decades. Relatively little is known about the longer term behaviour of the Greenland Ice Sheet, yet this information is valuable for assessing the significance of...
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Online Access: | http://dx.doi.org/10.1177/0959683618777067 http://journals.sagepub.com/doi/pdf/10.1177/0959683618777067 http://journals.sagepub.com/doi/full-xml/10.1177/0959683618777067 |
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crsagepubl:10.1177/0959683618777067 2023-05-15T16:21:13+02:00 The deglaciation of coastal areas of southeast Greenland Dyke, Laurence M Hughes, Anna LC Andresen, Camilla S Murray, Tavi Hiemstra, John F Bjørk, Anders A Rodés, Ángel Villum Fonden National Geographic Society Danish Centre for Sea Research Natural Environment Research Council Natural Environment Research Council Geocenter Denmark Leverhulme Trust Danish Independent Research Council 2018 http://dx.doi.org/10.1177/0959683618777067 http://journals.sagepub.com/doi/pdf/10.1177/0959683618777067 http://journals.sagepub.com/doi/full-xml/10.1177/0959683618777067 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 28, issue 9, page 1535-1544 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2018 crsagepubl https://doi.org/10.1177/0959683618777067 2022-09-21T19:47:30Z Large marine-terminating glaciers around the margins of the Greenland Ice Sheet have retreated, accelerated and thinned over the last two decades. Relatively little is known about the longer term behaviour of the Greenland Ice Sheet, yet this information is valuable for assessing the significance of modern changes. We address this by reporting 11 new beryllium-10 ( 10 Be) exposure ages from previously uninvestigated coastal areas across southeast Greenland. The new ages are combined with existing data from the region to assess the timing of glacier retreat after the Last Glacial Maximum. The results show that deglaciation occurred first in the north of the region (~68°N) and progressed southwards. This north–south progression is attributed to the influence of the warm Irminger Current on the ice margin. Areas in the south of the region were isolated from the warm waters by the shallow bathymetry of the continental shelf. This demonstrates that oceanographic forcing paced the deglaciation of southeast Greenland through the Younger Dryas and early Holocene. In most areas of southeast Greenland bedrock ages are systematically older than their counterpart boulder samples; this offset is likely the result of inherited 10 Be content in bedrock surfaces. This suggests that subglacial erosion during the last glacial cycle was insufficient to completely remove pre-existing 10 Be content. Alternatively, this pattern may be the signature of a substantial retreat and advance cycle prior to final Holocene deglaciation. Article in Journal/Newspaper glacier Greenland Ice Sheet SAGE Publications (via Crossref) Greenland The Holocene 28 9 1535 1544 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Dyke, Laurence M Hughes, Anna LC Andresen, Camilla S Murray, Tavi Hiemstra, John F Bjørk, Anders A Rodés, Ángel The deglaciation of coastal areas of southeast Greenland |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
Large marine-terminating glaciers around the margins of the Greenland Ice Sheet have retreated, accelerated and thinned over the last two decades. Relatively little is known about the longer term behaviour of the Greenland Ice Sheet, yet this information is valuable for assessing the significance of modern changes. We address this by reporting 11 new beryllium-10 ( 10 Be) exposure ages from previously uninvestigated coastal areas across southeast Greenland. The new ages are combined with existing data from the region to assess the timing of glacier retreat after the Last Glacial Maximum. The results show that deglaciation occurred first in the north of the region (~68°N) and progressed southwards. This north–south progression is attributed to the influence of the warm Irminger Current on the ice margin. Areas in the south of the region were isolated from the warm waters by the shallow bathymetry of the continental shelf. This demonstrates that oceanographic forcing paced the deglaciation of southeast Greenland through the Younger Dryas and early Holocene. In most areas of southeast Greenland bedrock ages are systematically older than their counterpart boulder samples; this offset is likely the result of inherited 10 Be content in bedrock surfaces. This suggests that subglacial erosion during the last glacial cycle was insufficient to completely remove pre-existing 10 Be content. Alternatively, this pattern may be the signature of a substantial retreat and advance cycle prior to final Holocene deglaciation. |
author2 |
Villum Fonden National Geographic Society Danish Centre for Sea Research Natural Environment Research Council Natural Environment Research Council Geocenter Denmark Leverhulme Trust Danish Independent Research Council |
format |
Article in Journal/Newspaper |
author |
Dyke, Laurence M Hughes, Anna LC Andresen, Camilla S Murray, Tavi Hiemstra, John F Bjørk, Anders A Rodés, Ángel |
author_facet |
Dyke, Laurence M Hughes, Anna LC Andresen, Camilla S Murray, Tavi Hiemstra, John F Bjørk, Anders A Rodés, Ángel |
author_sort |
Dyke, Laurence M |
title |
The deglaciation of coastal areas of southeast Greenland |
title_short |
The deglaciation of coastal areas of southeast Greenland |
title_full |
The deglaciation of coastal areas of southeast Greenland |
title_fullStr |
The deglaciation of coastal areas of southeast Greenland |
title_full_unstemmed |
The deglaciation of coastal areas of southeast Greenland |
title_sort |
deglaciation of coastal areas of southeast greenland |
publisher |
SAGE Publications |
publishDate |
2018 |
url |
http://dx.doi.org/10.1177/0959683618777067 http://journals.sagepub.com/doi/pdf/10.1177/0959683618777067 http://journals.sagepub.com/doi/full-xml/10.1177/0959683618777067 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
The Holocene volume 28, issue 9, page 1535-1544 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683618777067 |
container_title |
The Holocene |
container_volume |
28 |
container_issue |
9 |
container_start_page |
1535 |
op_container_end_page |
1544 |
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1766009230150598656 |