The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data
About 16% of the Greenland Ice Sheet drains in the area of the Northeast Greenland shelf between 76°N and 80.5°N via marine terminating glaciers. Most of it is via the Northeast Greenland Ice Stream, the largest ice stream of Greenland. During ice ages, the ice sheet extended onto the continental sh...
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ftawi:oai:epic.awi.de:44292 2024-09-15T18:08:46+00:00 The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data Arndt, Jan Erik Jokat, Wilfried Dorschel, Boris 2017-03-15 https://epic.awi.de/id/eprint/44292/ http://www.sciencedirect.com/science/article/pii/S0277379117300835 https://hdl.handle.net/10013/epic.50922 unknown PERGAMON-ELSEVIER SCIENCE LTD Arndt, J. E. orcid:0000-0002-9413-1612 , Jokat, W. orcid:0000-0002-7793-5854 and Dorschel, B. orcid:0000-0002-3495-5927 (2017) The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data , Quaternary Science Reviews, 160 , pp. 45-56 . doi:10.1016/j.quascirev.2017.01.018 <https://doi.org/10.1016/j.quascirev.2017.01.018> , hdl:10013/epic.50922 EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 160, pp. 45-56, ISSN: 0277-3791 Article isiRev 2017 ftawi https://doi.org/10.1016/j.quascirev.2017.01.018 2024-06-24T04:17:43Z About 16% of the Greenland Ice Sheet drains in the area of the Northeast Greenland shelf between 76°N and 80.5°N via marine terminating glaciers. Most of it is via the Northeast Greenland Ice Stream, the largest ice stream of Greenland. During ice ages, the ice sheet extended onto the continental shelf and modern-day cross-shelf troughs were filled by ice streams. In this study, high-resolution hydro-acoustic data acquired during three decades of research were jointly investigated to reveal the past glacial conditions. Our data shows that Westwind Trough and Norske Trough were filled by fast flowing ice streams that extended to the shelf edge during the last glacial maximum. In between the cross-shelf troughs, ice domes resided on shallow banks that may have contributed about a decimetre to global sea level. Most probably these ice domes initiated fast ice flow through sinks in the inter-trough area. In Westwind Trough, ice sheet retreat to the inner shelf after the last glacial maximum was intermittent. In contrast, in Norske Trough the ice sheet retreat appears relatively rapid with no evidences for phases of grounding line stabilization. Probably during the Younger Dryas, the ice sheet readvanced to a mid-shelf position in both troughs documented by grounding zone wedges. During this time, a thick ice shelf was present in Norske Trough releasing tabular icebergs. Ice sheet retreat from the mid-shelf to the coastline during Holocene deglaciation was rapid. Article in Journal/Newspaper Greenland Ice Sheet Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Quaternary Science Reviews 160 45 56 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
About 16% of the Greenland Ice Sheet drains in the area of the Northeast Greenland shelf between 76°N and 80.5°N via marine terminating glaciers. Most of it is via the Northeast Greenland Ice Stream, the largest ice stream of Greenland. During ice ages, the ice sheet extended onto the continental shelf and modern-day cross-shelf troughs were filled by ice streams. In this study, high-resolution hydro-acoustic data acquired during three decades of research were jointly investigated to reveal the past glacial conditions. Our data shows that Westwind Trough and Norske Trough were filled by fast flowing ice streams that extended to the shelf edge during the last glacial maximum. In between the cross-shelf troughs, ice domes resided on shallow banks that may have contributed about a decimetre to global sea level. Most probably these ice domes initiated fast ice flow through sinks in the inter-trough area. In Westwind Trough, ice sheet retreat to the inner shelf after the last glacial maximum was intermittent. In contrast, in Norske Trough the ice sheet retreat appears relatively rapid with no evidences for phases of grounding line stabilization. Probably during the Younger Dryas, the ice sheet readvanced to a mid-shelf position in both troughs documented by grounding zone wedges. During this time, a thick ice shelf was present in Norske Trough releasing tabular icebergs. Ice sheet retreat from the mid-shelf to the coastline during Holocene deglaciation was rapid. |
format |
Article in Journal/Newspaper |
author |
Arndt, Jan Erik Jokat, Wilfried Dorschel, Boris |
spellingShingle |
Arndt, Jan Erik Jokat, Wilfried Dorschel, Boris The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data |
author_facet |
Arndt, Jan Erik Jokat, Wilfried Dorschel, Boris |
author_sort |
Arndt, Jan Erik |
title |
The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data |
title_short |
The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data |
title_full |
The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data |
title_fullStr |
The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data |
title_full_unstemmed |
The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data |
title_sort |
last glaciation and deglaciation of the northeast greenland continental shelf revealed by hydro-acoustic data |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/44292/ http://www.sciencedirect.com/science/article/pii/S0277379117300835 https://hdl.handle.net/10013/epic.50922 |
genre |
Greenland Ice Sheet Ice Shelf |
genre_facet |
Greenland Ice Sheet Ice Shelf |
op_source |
EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 160, pp. 45-56, ISSN: 0277-3791 |
op_relation |
Arndt, J. E. orcid:0000-0002-9413-1612 , Jokat, W. orcid:0000-0002-7793-5854 and Dorschel, B. orcid:0000-0002-3495-5927 (2017) The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data , Quaternary Science Reviews, 160 , pp. 45-56 . doi:10.1016/j.quascirev.2017.01.018 <https://doi.org/10.1016/j.quascirev.2017.01.018> , hdl:10013/epic.50922 |
op_doi |
https://doi.org/10.1016/j.quascirev.2017.01.018 |
container_title |
Quaternary Science Reviews |
container_volume |
160 |
container_start_page |
45 |
op_container_end_page |
56 |
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1810446140757245952 |