Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss
Abstract Ice shelves restrain flow from the Greenland and Antarctic ice sheets. Climate-ocean warming could force thinning or collapse of floating ice shelves and subsequently accelerate flow, increase ice discharge and raise global mean sea levels. Petermann Glacier (PG), northwest Greenland, recen...
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Online Access: | http://dx.doi.org/10.1017/jog.2020.97 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143020000970 |
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crcambridgeupr:10.1017/jog.2020.97 2024-09-15T17:48:08+00:00 Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss Hill, Emily A. Gudmundsson, G. Hilmar Carr, J. Rachel Stokes, Chris R. King, Helen M. 2020 http://dx.doi.org/10.1017/jog.2020.97 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143020000970 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 67, issue 261, page 147-157 ISSN 0022-1430 1727-5652 journal-article 2020 crcambridgeupr https://doi.org/10.1017/jog.2020.97 2024-07-17T04:02:26Z Abstract Ice shelves restrain flow from the Greenland and Antarctic ice sheets. Climate-ocean warming could force thinning or collapse of floating ice shelves and subsequently accelerate flow, increase ice discharge and raise global mean sea levels. Petermann Glacier (PG), northwest Greenland, recently lost large sections of its ice shelf, but its response to total ice shelf loss in the future remains uncertain. Here, we use the ice flow model Úa to assess the sensitivity of PG to changes in ice shelf extent, and to estimate the resultant loss of grounded ice and contribution to sea level rise. Our results have shown that under several scenarios of ice shelf thinning and retreat, removal of the shelf will not contribute substantially to global mean sea level (<1 mm). We hypothesize that grounded ice loss was limited by the stabilization of the grounding line at a topographic high ~12 km inland of its current grounding line position. Further inland, the likelihood of a narrow fjord that slopes seawards suggests that PG is likely to remain insensitive to terminus changes in the near future. Article in Journal/Newspaper Antarc* Antarctic glacier Greenland Ice Shelf Ice Shelves Journal of Glaciology Petermann glacier Cambridge University Press Journal of Glaciology 67 261 147 157 |
institution |
Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Ice shelves restrain flow from the Greenland and Antarctic ice sheets. Climate-ocean warming could force thinning or collapse of floating ice shelves and subsequently accelerate flow, increase ice discharge and raise global mean sea levels. Petermann Glacier (PG), northwest Greenland, recently lost large sections of its ice shelf, but its response to total ice shelf loss in the future remains uncertain. Here, we use the ice flow model Úa to assess the sensitivity of PG to changes in ice shelf extent, and to estimate the resultant loss of grounded ice and contribution to sea level rise. Our results have shown that under several scenarios of ice shelf thinning and retreat, removal of the shelf will not contribute substantially to global mean sea level (<1 mm). We hypothesize that grounded ice loss was limited by the stabilization of the grounding line at a topographic high ~12 km inland of its current grounding line position. Further inland, the likelihood of a narrow fjord that slopes seawards suggests that PG is likely to remain insensitive to terminus changes in the near future. |
format |
Article in Journal/Newspaper |
author |
Hill, Emily A. Gudmundsson, G. Hilmar Carr, J. Rachel Stokes, Chris R. King, Helen M. |
spellingShingle |
Hill, Emily A. Gudmundsson, G. Hilmar Carr, J. Rachel Stokes, Chris R. King, Helen M. Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss |
author_facet |
Hill, Emily A. Gudmundsson, G. Hilmar Carr, J. Rachel Stokes, Chris R. King, Helen M. |
author_sort |
Hill, Emily A. |
title |
Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss |
title_short |
Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss |
title_full |
Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss |
title_fullStr |
Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss |
title_full_unstemmed |
Twenty-first century response of Petermann Glacier, northwest Greenland to ice shelf loss |
title_sort |
twenty-first century response of petermann glacier, northwest greenland to ice shelf loss |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/jog.2020.97 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143020000970 |
genre |
Antarc* Antarctic glacier Greenland Ice Shelf Ice Shelves Journal of Glaciology Petermann glacier |
genre_facet |
Antarc* Antarctic glacier Greenland Ice Shelf Ice Shelves Journal of Glaciology Petermann glacier |
op_source |
Journal of Glaciology volume 67, issue 261, page 147-157 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2020.97 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
261 |
container_start_page |
147 |
op_container_end_page |
157 |
_version_ |
1810289256527036416 |