Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales
Ocean‐driven basal melting of Amundsen Sea ice shelves has triggered acceleration, thinning, and grounding line retreat on many West Antarctic outlet glaciers. Here we present the first year‐long (2014) record of basal melt rate at sub‐weekly resolution from a location on the outer Pine Island Ice S...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union
2018
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ftnerc:oai:nora.nerc.ac.uk:518621 2023-05-15T13:24:02+02:00 Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales Davis, Peter E.D. Jenkins, Adrian Nicholls, Keith W. Brennan, Paul V. Abrahamsen, E. Povl Heywood, Karen J. Dutrieux, Pierre Cho, Kyoung-Ho Kim, Tae-Wan 2018-11-14 text http://nora.nerc.ac.uk/id/eprint/518621/ https://nora.nerc.ac.uk/id/eprint/518621/1/Davis_et_al-2018-Journal_of_Geophysical_Research__Oceans.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JC014464 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/518621/1/Davis_et_al-2018-Journal_of_Geophysical_Research__Oceans.pdf Davis, Peter E.D. orcid:0000-0002-6471-6310 Jenkins, Adrian orcid:0000-0002-9117-0616 Nicholls, Keith W. orcid:0000-0002-2188-4509 Brennan, Paul V.; Abrahamsen, E. Povl orcid:0000-0001-5924-5350 Heywood, Karen J.; Dutrieux, Pierre; Cho, Kyoung-Ho; Kim, Tae-Wan. 2018 Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales. Journal of Geophysical Research: Oceans, 123 (11). 8655-8669. https://doi.org/10.1029/2018JC014464 <https://doi.org/10.1029/2018JC014464> cc_by_4 CC-BY Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1029/2018JC014464 2023-02-04T19:45:46Z Ocean‐driven basal melting of Amundsen Sea ice shelves has triggered acceleration, thinning, and grounding line retreat on many West Antarctic outlet glaciers. Here we present the first year‐long (2014) record of basal melt rate at sub‐weekly resolution from a location on the outer Pine Island Ice Shelf. Adjustment of the upper thermocline to local wind forced variability in the vertical Ekman velocity is the dominant control on basal melting at weekly to monthly timescales. Atmosphere–ice–ocean surface heat fluxes or changes in advection of modified Circumpolar Deep Water play no discernible role at these timescales. We propose that during other years, a deepening of the thermocline in Pine Island Bay driven by longer timescale processes may have suppressed the impact of local wind forcing on high‐frequency upper thermocline height variability and basal melting. This highlights the complex interplay between the different processes and their timescales that set the basal melt rate beneath Pine Island Ice Shelf. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Shelf Ice Shelves Pine Island Bay Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Amundsen Sea Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) Journal of Geophysical Research: Oceans 123 11 8655 8669 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Ocean‐driven basal melting of Amundsen Sea ice shelves has triggered acceleration, thinning, and grounding line retreat on many West Antarctic outlet glaciers. Here we present the first year‐long (2014) record of basal melt rate at sub‐weekly resolution from a location on the outer Pine Island Ice Shelf. Adjustment of the upper thermocline to local wind forced variability in the vertical Ekman velocity is the dominant control on basal melting at weekly to monthly timescales. Atmosphere–ice–ocean surface heat fluxes or changes in advection of modified Circumpolar Deep Water play no discernible role at these timescales. We propose that during other years, a deepening of the thermocline in Pine Island Bay driven by longer timescale processes may have suppressed the impact of local wind forcing on high‐frequency upper thermocline height variability and basal melting. This highlights the complex interplay between the different processes and their timescales that set the basal melt rate beneath Pine Island Ice Shelf. |
format |
Article in Journal/Newspaper |
author |
Davis, Peter E.D. Jenkins, Adrian Nicholls, Keith W. Brennan, Paul V. Abrahamsen, E. Povl Heywood, Karen J. Dutrieux, Pierre Cho, Kyoung-Ho Kim, Tae-Wan |
spellingShingle |
Davis, Peter E.D. Jenkins, Adrian Nicholls, Keith W. Brennan, Paul V. Abrahamsen, E. Povl Heywood, Karen J. Dutrieux, Pierre Cho, Kyoung-Ho Kim, Tae-Wan Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales |
author_facet |
Davis, Peter E.D. Jenkins, Adrian Nicholls, Keith W. Brennan, Paul V. Abrahamsen, E. Povl Heywood, Karen J. Dutrieux, Pierre Cho, Kyoung-Ho Kim, Tae-Wan |
author_sort |
Davis, Peter E.D. |
title |
Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales |
title_short |
Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales |
title_full |
Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales |
title_fullStr |
Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales |
title_full_unstemmed |
Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales |
title_sort |
variability in basal melting beneath pine island ice shelf on weekly to monthly timescales |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/518621/ https://nora.nerc.ac.uk/id/eprint/518621/1/Davis_et_al-2018-Journal_of_Geophysical_Research__Oceans.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JC014464 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
Antarctic Amundsen Sea Island Bay Pine Island Bay |
geographic_facet |
Antarctic Amundsen Sea Island Bay Pine Island Bay |
genre |
Amundsen Sea Antarc* Antarctic Ice Shelf Ice Shelves Pine Island Bay Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Shelf Ice Shelves Pine Island Bay Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/518621/1/Davis_et_al-2018-Journal_of_Geophysical_Research__Oceans.pdf Davis, Peter E.D. orcid:0000-0002-6471-6310 Jenkins, Adrian orcid:0000-0002-9117-0616 Nicholls, Keith W. orcid:0000-0002-2188-4509 Brennan, Paul V.; Abrahamsen, E. Povl orcid:0000-0001-5924-5350 Heywood, Karen J.; Dutrieux, Pierre; Cho, Kyoung-Ho; Kim, Tae-Wan. 2018 Variability in basal melting beneath Pine Island Ice Shelf on weekly to monthly timescales. Journal of Geophysical Research: Oceans, 123 (11). 8655-8669. https://doi.org/10.1029/2018JC014464 <https://doi.org/10.1029/2018JC014464> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2018JC014464 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
11 |
container_start_page |
8655 |
op_container_end_page |
8669 |
_version_ |
1766377056344473600 |