Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream.
New relative sea-level (RSL) data from Disko Bugt, a large marine embayment in West Greenland, are used to examine the deglacial history of the Jakobshavns Isbrae ice stream. RSL data show rapid deglaciation after 10.3rka cal. yr BP. Once deglaciation began, a bedrock high in the west of the bay exe...
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2003
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Online Access: | http://dro.dur.ac.uk/1255/ https://doi.org/10.1080/03009480310001119 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:1255 2023-05-15T16:01:05+02:00 Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. Long., A. J. Roberts, D. H. 2003-03 http://dro.dur.ac.uk/1255/ https://doi.org/10.1080/03009480310001119 unknown Taylor & Francis dro:1255 issn:0300-9483 issn: 1502-3885 doi:10.1080/03009480310001119 http://dro.dur.ac.uk/1255/ http://dx.doi.org/10.1080/03009480310001119 Boreas, 2003, Vol.32(1), pp.208-226 [Peer Reviewed Journal] Sea-Level Changes Age Calibration Glacier Basin Stratigraphy Balance Shelves Island Article PeerReviewed 2003 ftunivdurham https://doi.org/10.1080/03009480310001119 2020-05-28T22:25:21Z New relative sea-level (RSL) data from Disko Bugt, a large marine embayment in West Greenland, are used to examine the deglacial history of the Jakobshavns Isbrae ice stream. RSL data show rapid deglaciation after 10.3rka cal. yr BP. Once deglaciation began, a bedrock high in the west of the bay exerted no discernible influence on the deglacial chronology. Following initial rapid retreat, ice stream recession slowed as it approached the eastern shores of the bay. Seabed elevations increase here and the ice stream terminus lingered for several thousand years before retreating into the narrow bedrock-confined Jakobshavns Isfjord. The seabed topography of Disko Bugt includes several deep channels which probably record the former course of the ice stream. Using a simple water depth/calving velocity relationship it is estimated that the maximum calving velocity on deglaciation was c. 4.8rkm am1. This is less than the present rate (6-7rkmram1), although ice discharge was two to four times that observed today. Initiation of rapid ice stream retreat was probably caused by ice stream thinning and increased surface melting. A critical point in time was the retreat of the ice stream from shallow continental shelf waters (c. 400rm) into the deep bedrock trough (>800rm) which marks the entrance to Disko Bugt. Article in Journal/Newspaper Disko bugt glacier Greenland Durham University: Durham Research Online Greenland Isfjord ENVELOPE(-26.917,-26.917,73.333,73.333) Boreas 32 1 208 226 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
topic |
Sea-Level Changes Age Calibration Glacier Basin Stratigraphy Balance Shelves Island |
spellingShingle |
Sea-Level Changes Age Calibration Glacier Basin Stratigraphy Balance Shelves Island Long., A. J. Roberts, D. H. Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. |
topic_facet |
Sea-Level Changes Age Calibration Glacier Basin Stratigraphy Balance Shelves Island |
description |
New relative sea-level (RSL) data from Disko Bugt, a large marine embayment in West Greenland, are used to examine the deglacial history of the Jakobshavns Isbrae ice stream. RSL data show rapid deglaciation after 10.3rka cal. yr BP. Once deglaciation began, a bedrock high in the west of the bay exerted no discernible influence on the deglacial chronology. Following initial rapid retreat, ice stream recession slowed as it approached the eastern shores of the bay. Seabed elevations increase here and the ice stream terminus lingered for several thousand years before retreating into the narrow bedrock-confined Jakobshavns Isfjord. The seabed topography of Disko Bugt includes several deep channels which probably record the former course of the ice stream. Using a simple water depth/calving velocity relationship it is estimated that the maximum calving velocity on deglaciation was c. 4.8rkm am1. This is less than the present rate (6-7rkmram1), although ice discharge was two to four times that observed today. Initiation of rapid ice stream retreat was probably caused by ice stream thinning and increased surface melting. A critical point in time was the retreat of the ice stream from shallow continental shelf waters (c. 400rm) into the deep bedrock trough (>800rm) which marks the entrance to Disko Bugt. |
format |
Article in Journal/Newspaper |
author |
Long., A. J. Roberts, D. H. |
author_facet |
Long., A. J. Roberts, D. H. |
author_sort |
Long., A. J. |
title |
Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. |
title_short |
Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. |
title_full |
Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. |
title_fullStr |
Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. |
title_full_unstemmed |
Late Weichselian deglacial history of Disko Bugt, West Greenland, and the dynamics of the Jakobshavns Isbrae ice stream. |
title_sort |
late weichselian deglacial history of disko bugt, west greenland, and the dynamics of the jakobshavns isbrae ice stream. |
publisher |
Taylor & Francis |
publishDate |
2003 |
url |
http://dro.dur.ac.uk/1255/ https://doi.org/10.1080/03009480310001119 |
long_lat |
ENVELOPE(-26.917,-26.917,73.333,73.333) |
geographic |
Greenland Isfjord |
geographic_facet |
Greenland Isfjord |
genre |
Disko bugt glacier Greenland |
genre_facet |
Disko bugt glacier Greenland |
op_source |
Boreas, 2003, Vol.32(1), pp.208-226 [Peer Reviewed Journal] |
op_relation |
dro:1255 issn:0300-9483 issn: 1502-3885 doi:10.1080/03009480310001119 http://dro.dur.ac.uk/1255/ http://dx.doi.org/10.1080/03009480310001119 |
op_doi |
https://doi.org/10.1080/03009480310001119 |
container_title |
Boreas |
container_volume |
32 |
container_issue |
1 |
container_start_page |
208 |
op_container_end_page |
226 |
_version_ |
1766397089046069248 |