A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland
Hydrographic data collected during five summer surveys between 2002 and 2015 reveal that the subsurface ocean near Petermann Gletscher, Greenland warmed by 0.015 ± 0.013°C yr-1. New 2015 - 2016 mooring data from beneath Petermann Gletscher’s ice shelf imply a continued warming of 0.025 ± 0.013°C yr-...
Published in: | Journal of Physical Oceanography |
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Language: | English |
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American Meteorological Society
2018
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521018/ https://nora.nerc.ac.uk/id/eprint/521018/1/jpo-d-17-0181.1.pdf https://doi.org/10.1175/JPO-D-17-0181.1 |
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ftnerc:oai:nora.nerc.ac.uk:521018 2023-05-15T16:21:14+02:00 A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland Washam, P. Münchow, A. Nicholls, Keith W. 2018-10 text http://nora.nerc.ac.uk/id/eprint/521018/ https://nora.nerc.ac.uk/id/eprint/521018/1/jpo-d-17-0181.1.pdf https://doi.org/10.1175/JPO-D-17-0181.1 en eng American Meteorological Society https://nora.nerc.ac.uk/id/eprint/521018/1/jpo-d-17-0181.1.pdf Washam, P.; Münchow, A.; Nicholls, Keith W. orcid:0000-0002-2188-4509 . 2018 A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland. Journal of Physical Oceanography, 48 (10). 2477-2493. https://doi.org/10.1175/JPO-D-17-0181.1 <https://doi.org/10.1175/JPO-D-17-0181.1> Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1175/JPO-D-17-0181.1 2023-02-04T19:47:06Z Hydrographic data collected during five summer surveys between 2002 and 2015 reveal that the subsurface ocean near Petermann Gletscher, Greenland warmed by 0.015 ± 0.013°C yr-1. New 2015 - 2016 mooring data from beneath Petermann Gletscher’s ice shelf imply a continued warming of 0.025 ± 0.013°C yr-1 with a modest seasonal signal. In 2015 we measured ocean temperatures of 0.28°C near the grounding line of Petermann Gletscher’s ice shelf, which drove submarine melting along the base of the glacier. The resultant meltwater contributed to ocean stratification, which forced a stronger geostrophic circulation at the ice shelf terminus compared with previous years. This increased both the freshwater flux away from the sub-ice shelf cavity and the heat flux into it. Net summertime geostrophic heat flux estimates into the sub-ice shelf cavity exceed the requirement for steady-state melting of Petermann Gletscher’s ice shelf. Likewise, freshwater fluxes away from the glacier exceed the expected steady-state meltwater discharge. These results suggest that the warmer, more active ocean surrounding Petermann Gletscher forces “non steady-state” melting of its ice shelf. When sustained, such melting thins the ice shelf. Article in Journal/Newspaper glacier Greenland Ice Shelf Petermann gletscher Natural Environment Research Council: NERC Open Research Archive Greenland Petermann Gletscher ENVELOPE(-59.500,-59.500,80.500,80.500) Journal of Physical Oceanography 48 10 2477 2493 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Hydrographic data collected during five summer surveys between 2002 and 2015 reveal that the subsurface ocean near Petermann Gletscher, Greenland warmed by 0.015 ± 0.013°C yr-1. New 2015 - 2016 mooring data from beneath Petermann Gletscher’s ice shelf imply a continued warming of 0.025 ± 0.013°C yr-1 with a modest seasonal signal. In 2015 we measured ocean temperatures of 0.28°C near the grounding line of Petermann Gletscher’s ice shelf, which drove submarine melting along the base of the glacier. The resultant meltwater contributed to ocean stratification, which forced a stronger geostrophic circulation at the ice shelf terminus compared with previous years. This increased both the freshwater flux away from the sub-ice shelf cavity and the heat flux into it. Net summertime geostrophic heat flux estimates into the sub-ice shelf cavity exceed the requirement for steady-state melting of Petermann Gletscher’s ice shelf. Likewise, freshwater fluxes away from the glacier exceed the expected steady-state meltwater discharge. These results suggest that the warmer, more active ocean surrounding Petermann Gletscher forces “non steady-state” melting of its ice shelf. When sustained, such melting thins the ice shelf. |
format |
Article in Journal/Newspaper |
author |
Washam, P. Münchow, A. Nicholls, Keith W. |
spellingShingle |
Washam, P. Münchow, A. Nicholls, Keith W. A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland |
author_facet |
Washam, P. Münchow, A. Nicholls, Keith W. |
author_sort |
Washam, P. |
title |
A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland |
title_short |
A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland |
title_full |
A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland |
title_fullStr |
A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland |
title_full_unstemmed |
A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland |
title_sort |
decade of ocean changes impacting the ice shelf of petermann gletscher, greenland |
publisher |
American Meteorological Society |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/521018/ https://nora.nerc.ac.uk/id/eprint/521018/1/jpo-d-17-0181.1.pdf https://doi.org/10.1175/JPO-D-17-0181.1 |
long_lat |
ENVELOPE(-59.500,-59.500,80.500,80.500) |
geographic |
Greenland Petermann Gletscher |
geographic_facet |
Greenland Petermann Gletscher |
genre |
glacier Greenland Ice Shelf Petermann gletscher |
genre_facet |
glacier Greenland Ice Shelf Petermann gletscher |
op_relation |
https://nora.nerc.ac.uk/id/eprint/521018/1/jpo-d-17-0181.1.pdf Washam, P.; Münchow, A.; Nicholls, Keith W. orcid:0000-0002-2188-4509 . 2018 A decade of ocean changes impacting the ice shelf of Petermann Gletscher, Greenland. Journal of Physical Oceanography, 48 (10). 2477-2493. https://doi.org/10.1175/JPO-D-17-0181.1 <https://doi.org/10.1175/JPO-D-17-0181.1> |
op_doi |
https://doi.org/10.1175/JPO-D-17-0181.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
48 |
container_issue |
10 |
container_start_page |
2477 |
op_container_end_page |
2493 |
_version_ |
1766009246473781248 |