The Jakobshanvs Effect
The Jakobshavns Effect may have been a significant factor in hastening the collapse of palaeo ice sheets with the advent of climatic warming after 18,000 years ago and may precipitate partial collapse of the present‐day Greenland and Antarctic Ice Sheets following CO2‐induced climatic warming in the...
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1986
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:ers_facpub-1101 2023-05-15T13:40:24+02:00 The Jakobshanvs Effect Hughes, Terence J. 1986-01-01T08:00:00Z application/pdf https://digitalcommons.library.umaine.edu/ers_facpub/102 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1101&context=ers_facpub unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/ers_facpub/102 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1101&context=ers_facpub This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). Earth Science Faculty Scholarship Earth Sciences text 1986 ftmaineuniv 2023-03-12T18:54:03Z The Jakobshavns Effect may have been a significant factor in hastening the collapse of palaeo ice sheets with the advent of climatic warming after 18,000 years ago and may precipitate partial collapse of the present‐day Greenland and Antarctic Ice Sheets following CO2‐induced climatic warming in the decades ahead. The Jakobshavns Effect is observed today on Jakobshavns Glacier, which is located at 69°10′N on the west coast of Greenland. The Jakobshavns Effect is a group of positive feedback mechanisms which allow Jakobshavns Glacier to literally pull ice out of the Greenland Ice Sheet at a rate exceeding 7 km/a across a floating terminus 800 m thick and 6 km wide. The pulling power results from an imbalance of horizontal hydrostatic forces in ice and water columns at the grounding line of the floating terminus. Positive feedback mechanisms that sustain the rapid ice discharge rate are ubiquitous surface crevassing, high summer rates of surface melting, extending creep flow, progressive basal uncoupling, progressive lateral uncoupling, and rapid iceberg calving. Text Antarc* Antarctic glacier Greenland Ice Sheet Iceberg* The University of Maine: DigitalCommons@UMaine Antarctic Greenland |
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The University of Maine: DigitalCommons@UMaine |
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ftmaineuniv |
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Earth Sciences |
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Earth Sciences Hughes, Terence J. The Jakobshanvs Effect |
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Earth Sciences |
description |
The Jakobshavns Effect may have been a significant factor in hastening the collapse of palaeo ice sheets with the advent of climatic warming after 18,000 years ago and may precipitate partial collapse of the present‐day Greenland and Antarctic Ice Sheets following CO2‐induced climatic warming in the decades ahead. The Jakobshavns Effect is observed today on Jakobshavns Glacier, which is located at 69°10′N on the west coast of Greenland. The Jakobshavns Effect is a group of positive feedback mechanisms which allow Jakobshavns Glacier to literally pull ice out of the Greenland Ice Sheet at a rate exceeding 7 km/a across a floating terminus 800 m thick and 6 km wide. The pulling power results from an imbalance of horizontal hydrostatic forces in ice and water columns at the grounding line of the floating terminus. Positive feedback mechanisms that sustain the rapid ice discharge rate are ubiquitous surface crevassing, high summer rates of surface melting, extending creep flow, progressive basal uncoupling, progressive lateral uncoupling, and rapid iceberg calving. |
format |
Text |
author |
Hughes, Terence J. |
author_facet |
Hughes, Terence J. |
author_sort |
Hughes, Terence J. |
title |
The Jakobshanvs Effect |
title_short |
The Jakobshanvs Effect |
title_full |
The Jakobshanvs Effect |
title_fullStr |
The Jakobshanvs Effect |
title_full_unstemmed |
The Jakobshanvs Effect |
title_sort |
jakobshanvs effect |
publisher |
DigitalCommons@UMaine |
publishDate |
1986 |
url |
https://digitalcommons.library.umaine.edu/ers_facpub/102 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1101&context=ers_facpub |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic glacier Greenland Ice Sheet Iceberg* |
genre_facet |
Antarc* Antarctic glacier Greenland Ice Sheet Iceberg* |
op_source |
Earth Science Faculty Scholarship |
op_relation |
https://digitalcommons.library.umaine.edu/ers_facpub/102 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1101&context=ers_facpub |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
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