Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland
The Uummannaq Ice Stream System (UISS) was a convergent cross-shelf ice stream system that operated in West Greenland during the Last Glacial Maximum (LGM). This paper presents new evidence constraining the geometry and evolution of the northern sector of the UISS and considers the factors controlli...
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ftliverpooljmu:oai:researchonline.ljmu.ac.uk:2501 2024-09-15T18:09:22+00:00 Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland Lane, TP Roberts, DH Rea, BR Ó Cofaigh, C Vieli, A Rodés, A 2013-11-27 text http://researchonline.ljmu.ac.uk/id/eprint/2501/ https://researchonline.ljmu.ac.uk/id/eprint/2501/1/Lane%20et%20al%202014%20Resumbission.pdf https://doi.org/10.1016/j.quascirev.2013.09.013 en eng Elsevier https://researchonline.ljmu.ac.uk/id/eprint/2501/1/Lane%20et%20al%202014%20Resumbission.pdf Lane, TP, Roberts, DH, Rea, BR, Ó Cofaigh, C, Vieli, A and Rodés, A (2013) Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland. Quaternary Science Reviews, 92. pp. 324-344. ISSN 1873-457X doi:10.1016/j.quascirev.2013.09.013 cc_by_nc_nd GB Physical geography Article PeerReviewed 2013 ftliverpooljmu https://doi.org/10.1016/j.quascirev.2013.09.013 2024-07-11T03:12:58Z The Uummannaq Ice Stream System (UISS) was a convergent cross-shelf ice stream system that operated in West Greenland during the Last Glacial Maximum (LGM). This paper presents new evidence constraining the geometry and evolution of the northern sector of the UISS and considers the factors controlling its dynamic behaviour. Geomorphological mapping, 21 new terrestrial cosmogenic nuclide (TCN) exposure ages, and radiocarbon dating constrain LGM warm-based ice stream activity in the north of the system up to 1400 m a.s.l. Intervening plateaux areas either remained ice free, or were covered by cold-based icefields. Beyond the inner fjords, topography and bathymetry forced ice flow southwards into the Uummannaq Trough, where it coalesced with ice from the south, and formed the trunk zone of the UISS. Deglaciation of the UISS began at 14.9 cal. ka BP. Rapid retreat from the LGM limit was forced by an increase in air temperatures and rising sea level, enhanced by the bathymetric over-deepening of the Uummannaq and Igdlorssuit Sund troughs. Ice reached the inner fjord confines in the northern Uummannaq area by 11.6 ka and experienced an ice marginal stabilisation in Rink–Karrat Fjord for up to 5 ka. This was a function of topographic constriction and bathymetric shallowing, and occurred despite continued climatic forcing. In the neighbouring Ingia Fjord this did not occur. Following this period of stability, ice within Rink–Karrat Fjord retreated, reaching the present ice margin or beyond after 5 ka. The presence of a major ice stream within a mid-fjord setting, during the mid-Holocene and the Holocene Thermal Maximum (∼11–5 ka) is in direct contrast to records of other ice streams throughout West Greenland, which suggest ice had retreated beyond its present margin by 9–7 ka. This demonstrates the potential importance of topographic control on calving margin stability, and its ability to override climatic forcing. Article in Journal/Newspaper Greenland Uummannaq Liverpool John Moores University: LJMU Research Online Quaternary Science Reviews 92 324 344 |
institution |
Open Polar |
collection |
Liverpool John Moores University: LJMU Research Online |
op_collection_id |
ftliverpooljmu |
language |
English |
topic |
GB Physical geography |
spellingShingle |
GB Physical geography Lane, TP Roberts, DH Rea, BR Ó Cofaigh, C Vieli, A Rodés, A Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland |
topic_facet |
GB Physical geography |
description |
The Uummannaq Ice Stream System (UISS) was a convergent cross-shelf ice stream system that operated in West Greenland during the Last Glacial Maximum (LGM). This paper presents new evidence constraining the geometry and evolution of the northern sector of the UISS and considers the factors controlling its dynamic behaviour. Geomorphological mapping, 21 new terrestrial cosmogenic nuclide (TCN) exposure ages, and radiocarbon dating constrain LGM warm-based ice stream activity in the north of the system up to 1400 m a.s.l. Intervening plateaux areas either remained ice free, or were covered by cold-based icefields. Beyond the inner fjords, topography and bathymetry forced ice flow southwards into the Uummannaq Trough, where it coalesced with ice from the south, and formed the trunk zone of the UISS. Deglaciation of the UISS began at 14.9 cal. ka BP. Rapid retreat from the LGM limit was forced by an increase in air temperatures and rising sea level, enhanced by the bathymetric over-deepening of the Uummannaq and Igdlorssuit Sund troughs. Ice reached the inner fjord confines in the northern Uummannaq area by 11.6 ka and experienced an ice marginal stabilisation in Rink–Karrat Fjord for up to 5 ka. This was a function of topographic constriction and bathymetric shallowing, and occurred despite continued climatic forcing. In the neighbouring Ingia Fjord this did not occur. Following this period of stability, ice within Rink–Karrat Fjord retreated, reaching the present ice margin or beyond after 5 ka. The presence of a major ice stream within a mid-fjord setting, during the mid-Holocene and the Holocene Thermal Maximum (∼11–5 ka) is in direct contrast to records of other ice streams throughout West Greenland, which suggest ice had retreated beyond its present margin by 9–7 ka. This demonstrates the potential importance of topographic control on calving margin stability, and its ability to override climatic forcing. |
format |
Article in Journal/Newspaper |
author |
Lane, TP Roberts, DH Rea, BR Ó Cofaigh, C Vieli, A Rodés, A |
author_facet |
Lane, TP Roberts, DH Rea, BR Ó Cofaigh, C Vieli, A Rodés, A |
author_sort |
Lane, TP |
title |
Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland |
title_short |
Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland |
title_full |
Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland |
title_fullStr |
Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland |
title_full_unstemmed |
Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland |
title_sort |
controls upon the last glacial maximum deglaciation of the northern uummannaq ice stream system, west greenland |
publisher |
Elsevier |
publishDate |
2013 |
url |
http://researchonline.ljmu.ac.uk/id/eprint/2501/ https://researchonline.ljmu.ac.uk/id/eprint/2501/1/Lane%20et%20al%202014%20Resumbission.pdf https://doi.org/10.1016/j.quascirev.2013.09.013 |
genre |
Greenland Uummannaq |
genre_facet |
Greenland Uummannaq |
op_relation |
https://researchonline.ljmu.ac.uk/id/eprint/2501/1/Lane%20et%20al%202014%20Resumbission.pdf Lane, TP, Roberts, DH, Rea, BR, Ó Cofaigh, C, Vieli, A and Rodés, A (2013) Controls upon the Last Glacial Maximum deglaciation of the northern Uummannaq Ice Stream System, West Greenland. Quaternary Science Reviews, 92. pp. 324-344. ISSN 1873-457X doi:10.1016/j.quascirev.2013.09.013 |
op_rights |
cc_by_nc_nd |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.09.013 |
container_title |
Quaternary Science Reviews |
container_volume |
92 |
container_start_page |
324 |
op_container_end_page |
344 |
_version_ |
1810446887038222336 |