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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ftuniveastangl:oai:ueaeprints.uea.ac.uk:69088 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 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/69088/ https://ueaeprints.uea.ac.uk/id/eprint/69088/1/Davis_et_al_2018_Journal_of_Geophysical_Research_Oceans.pdf https://doi.org/10.1029/2018JC014464 en eng https://ueaeprints.uea.ac.uk/id/eprint/69088/1/Davis_et_al_2018_Journal_of_Geophysical_Research_Oceans.pdf Davis, Peter E. D., Jenkins, Adrian, Nicholls, Keith W., Brennan, Paul V., Abrahamsen, E. Povl, Heywood, Karen J., Dutrieux, Pierre, Cho, Kyoung-Ho and 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). pp. 8655-8669. ISSN 2169-9275 doi:10.1029/2018JC014464 cc_by Article PeerReviewed 2018 ftuniveastangl https://doi.org/10.1029/2018JC014464 2023-03-23T23:32:27Z 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 University of East Anglia: UEA Digital Repository Amundsen Sea Antarctic 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 |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
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 |
publishDate |
2018 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/69088/ https://ueaeprints.uea.ac.uk/id/eprint/69088/1/Davis_et_al_2018_Journal_of_Geophysical_Research_Oceans.pdf https://doi.org/10.1029/2018JC014464 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
Amundsen Sea Antarctic Island Bay Pine Island Bay |
geographic_facet |
Amundsen Sea Antarctic 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://ueaeprints.uea.ac.uk/id/eprint/69088/1/Davis_et_al_2018_Journal_of_Geophysical_Research_Oceans.pdf Davis, Peter E. D., Jenkins, Adrian, Nicholls, Keith W., Brennan, Paul V., Abrahamsen, E. Povl, Heywood, Karen J., Dutrieux, Pierre, Cho, Kyoung-Ho and 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). pp. 8655-8669. ISSN 2169-9275 doi:10.1029/2018JC014464 |
op_rights |
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 |
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1766377060490543104 |