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...
Published in: | The Holocene |
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Language: | English |
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SAGE Publications
2018
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Online Access: | http://eprints.gla.ac.uk/172254/ http://eprints.gla.ac.uk/172254/1/172254.pdf |
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ftuglasgow:oai:eprints.gla.ac.uk:172254 2023-05-15T16:21:10+02:00 The deglaciation of coastal areas of southeast Greenland Dyke, Laurence M. Hughes, Anna L.C. Andresen, Camilla S. Murray, Tavi Hiemstra, John F. Bjørk, Anders A. Rodés, Ángel 2018-09 text http://eprints.gla.ac.uk/172254/ http://eprints.gla.ac.uk/172254/1/172254.pdf en eng SAGE Publications http://eprints.gla.ac.uk/172254/1/172254.pdf Dyke, L. M., Hughes, A. L.C., Andresen, C. S., Murray, T., Hiemstra, J. F., Bjørk, A. A. and Rodés, Á. <http://eprints.gla.ac.uk/view/author/15683.html> (2018) The deglaciation of coastal areas of southeast Greenland. Holocene <http://eprints.gla.ac.uk/view/journal_volume/Holocene.html>, 28(9), pp. 1535-1544. (doi:10.1177/0959683618777067 <http://dx.doi.org/10.1177/0959683618777067>) Articles PeerReviewed 2018 ftuglasgow https://doi.org/10.1177/0959683618777067 2020-01-10T01:45:59Z 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 (10Be) 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 10Be content in bedrock surfaces. This suggests that subglacial erosion during the last glacial cycle was insufficient to completely remove pre-existing 10Be 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 University of Glasgow: Enlighten - Publications Greenland The Holocene 28 9 1535 1544 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
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 (10Be) 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 10Be content in bedrock surfaces. This suggests that subglacial erosion during the last glacial cycle was insufficient to completely remove pre-existing 10Be content. Alternatively, this pattern may be the signature of a substantial retreat and advance cycle prior to final Holocene deglaciation. |
format |
Article in Journal/Newspaper |
author |
Dyke, Laurence M. Hughes, Anna L.C. Andresen, Camilla S. Murray, Tavi Hiemstra, John F. Bjørk, Anders A. Rodés, Ángel |
spellingShingle |
Dyke, Laurence M. Hughes, Anna L.C. Andresen, Camilla S. Murray, Tavi Hiemstra, John F. Bjørk, Anders A. Rodés, Ángel The deglaciation of coastal areas of southeast Greenland |
author_facet |
Dyke, Laurence M. Hughes, Anna L.C. 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://eprints.gla.ac.uk/172254/ http://eprints.gla.ac.uk/172254/1/172254.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_relation |
http://eprints.gla.ac.uk/172254/1/172254.pdf Dyke, L. M., Hughes, A. L.C., Andresen, C. S., Murray, T., Hiemstra, J. F., Bjørk, A. A. and Rodés, Á. <http://eprints.gla.ac.uk/view/author/15683.html> (2018) The deglaciation of coastal areas of southeast Greenland. Holocene <http://eprints.gla.ac.uk/view/journal_volume/Holocene.html>, 28(9), pp. 1535-1544. (doi:10.1177/0959683618777067 <http://dx.doi.org/10.1177/0959683618777067>) |
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 |
_version_ |
1766009191064928256 |