Net retreat of Antarctic glacier grounding lines
Grounding lines are a key indicator of ice-sheet instability, because changes in their position reflect imbalance with the surrounding ocean and affect the flow of inland ice. Although the grounding lines of several Antarctic glaciers have retreated rapidly due to ocean-driven melting, records are t...
Published in: | Nature Geoscience |
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Online Access: | https://epic.awi.de/id/eprint/46941/ https://epic.awi.de/id/eprint/46941/1/konrad_et_al_nature_geoscience_accepted.pdf https://doi.org/10.1038/s41561-018-0082-z https://hdl.handle.net/10013/epic.fb095e66-6550-4328-a538-299a560b8bf2 https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:46941 2023-05-15T13:24:03+02:00 Net retreat of Antarctic glacier grounding lines Konrad, Hannes Shepherd, Andrew Gilbert, Lin Hogg, Anna E. McMillan, Malcolm Muir, Alan Slater, Thomas 2018 application/pdf https://epic.awi.de/id/eprint/46941/ https://epic.awi.de/id/eprint/46941/1/konrad_et_al_nature_geoscience_accepted.pdf https://doi.org/10.1038/s41561-018-0082-z https://hdl.handle.net/10013/epic.fb095e66-6550-4328-a538-299a560b8bf2 https://hdl.handle.net/ unknown NATURE PUBLISHING GROUP https://epic.awi.de/id/eprint/46941/1/konrad_et_al_nature_geoscience_accepted.pdf https://hdl.handle.net/ Konrad, H. , Shepherd, A. , Gilbert, L. , Hogg, A. E. , McMillan, M. , Muir, A. and Slater, T. (2018) Net retreat of Antarctic glacier grounding lines , Nature Geoscience, 11 (4), pp. 258-262 . doi:10.1038/s41561-018-0082-z <https://doi.org/10.1038/s41561-018-0082-z> , hdl:10013/epic.fb095e66-6550-4328-a538-299a560b8bf2 EPIC3Nature Geoscience, NATURE PUBLISHING GROUP, 11(4), pp. 258-262, ISSN: 1752-0894 Article isiRev 2018 ftawi https://doi.org/10.1038/s41561-018-0082-z 2021-12-24T15:43:47Z Grounding lines are a key indicator of ice-sheet instability, because changes in their position reflect imbalance with the surrounding ocean and affect the flow of inland ice. Although the grounding lines of several Antarctic glaciers have retreated rapidly due to ocean-driven melting, records are too scarce to assess the scale of the imbalance. Here, we combine satellite altimeter observations of ice-elevation change and measurements of ice geometry to track grounding-line movement around the entire continent, tripling the coverage of previous surveys. Between 2010 and 2016, 22%, 3% and 10% of surveyed grounding lines in West Antarctica, East Antarctica and at the Antarctic Peninsula retreated at rates faster than 25 m yr^{−1} (the typical pace since the Last Glacial Maximum) and the continent has lost 1,463 km^2 +- 791 km^2 of grounded-ice area. Although by far the fastest rates of retreat occurred in the Amundsen Sea sector, we show that the Pine Island Glacier grounding line has stabilized, probably as a consequence of abated ocean forcing. On average, Antarctica’s fast-flowing ice streams retreat by 110 metres per metre of ice thinning. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Amundsen Sea Antarctic Antarctic Peninsula East Antarctica Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) The Antarctic West Antarctica Nature Geoscience 11 4 258 262 |
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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 |
Grounding lines are a key indicator of ice-sheet instability, because changes in their position reflect imbalance with the surrounding ocean and affect the flow of inland ice. Although the grounding lines of several Antarctic glaciers have retreated rapidly due to ocean-driven melting, records are too scarce to assess the scale of the imbalance. Here, we combine satellite altimeter observations of ice-elevation change and measurements of ice geometry to track grounding-line movement around the entire continent, tripling the coverage of previous surveys. Between 2010 and 2016, 22%, 3% and 10% of surveyed grounding lines in West Antarctica, East Antarctica and at the Antarctic Peninsula retreated at rates faster than 25 m yr^{−1} (the typical pace since the Last Glacial Maximum) and the continent has lost 1,463 km^2 +- 791 km^2 of grounded-ice area. Although by far the fastest rates of retreat occurred in the Amundsen Sea sector, we show that the Pine Island Glacier grounding line has stabilized, probably as a consequence of abated ocean forcing. On average, Antarctica’s fast-flowing ice streams retreat by 110 metres per metre of ice thinning. |
format |
Article in Journal/Newspaper |
author |
Konrad, Hannes Shepherd, Andrew Gilbert, Lin Hogg, Anna E. McMillan, Malcolm Muir, Alan Slater, Thomas |
spellingShingle |
Konrad, Hannes Shepherd, Andrew Gilbert, Lin Hogg, Anna E. McMillan, Malcolm Muir, Alan Slater, Thomas Net retreat of Antarctic glacier grounding lines |
author_facet |
Konrad, Hannes Shepherd, Andrew Gilbert, Lin Hogg, Anna E. McMillan, Malcolm Muir, Alan Slater, Thomas |
author_sort |
Konrad, Hannes |
title |
Net retreat of Antarctic glacier grounding lines |
title_short |
Net retreat of Antarctic glacier grounding lines |
title_full |
Net retreat of Antarctic glacier grounding lines |
title_fullStr |
Net retreat of Antarctic glacier grounding lines |
title_full_unstemmed |
Net retreat of Antarctic glacier grounding lines |
title_sort |
net retreat of antarctic glacier grounding lines |
publisher |
NATURE PUBLISHING GROUP |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/46941/ https://epic.awi.de/id/eprint/46941/1/konrad_et_al_nature_geoscience_accepted.pdf https://doi.org/10.1038/s41561-018-0082-z https://hdl.handle.net/10013/epic.fb095e66-6550-4328-a538-299a560b8bf2 https://hdl.handle.net/ |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica Pine Island Glacier The Antarctic West Antarctica |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica Pine Island Glacier The Antarctic West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica |
op_source |
EPIC3Nature Geoscience, NATURE PUBLISHING GROUP, 11(4), pp. 258-262, ISSN: 1752-0894 |
op_relation |
https://epic.awi.de/id/eprint/46941/1/konrad_et_al_nature_geoscience_accepted.pdf https://hdl.handle.net/ Konrad, H. , Shepherd, A. , Gilbert, L. , Hogg, A. E. , McMillan, M. , Muir, A. and Slater, T. (2018) Net retreat of Antarctic glacier grounding lines , Nature Geoscience, 11 (4), pp. 258-262 . doi:10.1038/s41561-018-0082-z <https://doi.org/10.1038/s41561-018-0082-z> , hdl:10013/epic.fb095e66-6550-4328-a538-299a560b8bf2 |
op_doi |
https://doi.org/10.1038/s41561-018-0082-z |
container_title |
Nature Geoscience |
container_volume |
11 |
container_issue |
4 |
container_start_page |
258 |
op_container_end_page |
262 |
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1766377170570051584 |