Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica
Antarctic ice sheet mass loss has been linked to an increase in oceanic heat supply, which enhances basal melt and thinning of ice shelves. Here we detail the interaction of modified Circumpolar Deep Water (mCDW) with the Amery Ice Shelf, the largest ice shelf in East Antarctica, and provide the fir...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://eprints.soton.ac.uk/398659/ https://eprints.soton.ac.uk/398659/1/jgrc21209.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:398659 2023-07-30T03:55:57+02:00 Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica Herraiz-Borreguero, Laura Coleman, Richard Allison, Ian Rintoul, Stephen R. Craven, Mike Williams, Guy D. 2015-04-26 text https://eprints.soton.ac.uk/398659/ https://eprints.soton.ac.uk/398659/1/jgrc21209.pdf en English eng https://eprints.soton.ac.uk/398659/1/jgrc21209.pdf Herraiz-Borreguero, Laura, Coleman, Richard, Allison, Ian, Rintoul, Stephen R., Craven, Mike and Williams, Guy D. (2015) Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica. Journal of Geophysical Research: Oceans, 120 (4), 3098-3112. (doi:10.1002/2015JC010697 <http://dx.doi.org/10.1002/2015JC010697>). Article PeerReviewed 2015 ftsouthampton https://doi.org/10.1002/2015JC010697 2023-07-09T22:09:48Z Antarctic ice sheet mass loss has been linked to an increase in oceanic heat supply, which enhances basal melt and thinning of ice shelves. Here we detail the interaction of modified Circumpolar Deep Water (mCDW) with the Amery Ice Shelf, the largest ice shelf in East Antarctica, and provide the first estimates of basal melting due to mCDW. We use subice shelf ocean observations from a borehole site (AM02) situated ?70 km inshore of the ice shelf front, together with open ocean observations in Prydz Bay. We find that mCDW transport into the cavity is about 0.22?±?0.06 Sv (1 Sv?=?106 m3 s?1). The inflow of mCDW drives a net basal melt rate of up to 2?±?0.5 m yr?1 during 2001 (23.9?±?6.52 Gt yr?1 from under about 12,800 km2 of the north-eastern flank of the ice shelf). The heat content flux by mCDW at AM02 shows high intra-annual variability (up to 40%). Our results suggest two main modes of subice shelf circulation and basal melt regimes: (1) the “ice pump”/high salinity shelf water circulation, on the western flank and (2) the mCDW meltwater-driven circulation in conjunction with the “ice pump,” on the eastern flank. These results highlight the sensitivity of the Amery's basal melting to changes in mCDW inflow. Improved understanding of such ice shelf-ocean interaction is crucial to refining projections of mass loss and associated sea level rise. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Ice Shelf Ice Shelves Prydz Bay University of Southampton: e-Prints Soton Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic East Antarctica Prydz Bay Journal of Geophysical Research: Oceans 120 4 3098 3112 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Antarctic ice sheet mass loss has been linked to an increase in oceanic heat supply, which enhances basal melt and thinning of ice shelves. Here we detail the interaction of modified Circumpolar Deep Water (mCDW) with the Amery Ice Shelf, the largest ice shelf in East Antarctica, and provide the first estimates of basal melting due to mCDW. We use subice shelf ocean observations from a borehole site (AM02) situated ?70 km inshore of the ice shelf front, together with open ocean observations in Prydz Bay. We find that mCDW transport into the cavity is about 0.22?±?0.06 Sv (1 Sv?=?106 m3 s?1). The inflow of mCDW drives a net basal melt rate of up to 2?±?0.5 m yr?1 during 2001 (23.9?±?6.52 Gt yr?1 from under about 12,800 km2 of the north-eastern flank of the ice shelf). The heat content flux by mCDW at AM02 shows high intra-annual variability (up to 40%). Our results suggest two main modes of subice shelf circulation and basal melt regimes: (1) the “ice pump”/high salinity shelf water circulation, on the western flank and (2) the mCDW meltwater-driven circulation in conjunction with the “ice pump,” on the eastern flank. These results highlight the sensitivity of the Amery's basal melting to changes in mCDW inflow. Improved understanding of such ice shelf-ocean interaction is crucial to refining projections of mass loss and associated sea level rise. |
format |
Article in Journal/Newspaper |
author |
Herraiz-Borreguero, Laura Coleman, Richard Allison, Ian Rintoul, Stephen R. Craven, Mike Williams, Guy D. |
spellingShingle |
Herraiz-Borreguero, Laura Coleman, Richard Allison, Ian Rintoul, Stephen R. Craven, Mike Williams, Guy D. Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica |
author_facet |
Herraiz-Borreguero, Laura Coleman, Richard Allison, Ian Rintoul, Stephen R. Craven, Mike Williams, Guy D. |
author_sort |
Herraiz-Borreguero, Laura |
title |
Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica |
title_short |
Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica |
title_full |
Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica |
title_fullStr |
Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica |
title_full_unstemmed |
Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica |
title_sort |
circulation of modified circumpolar deep water and basal melt beneath the amery ice shelf, east antarctica |
publishDate |
2015 |
url |
https://eprints.soton.ac.uk/398659/ https://eprints.soton.ac.uk/398659/1/jgrc21209.pdf |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf Antarctic East Antarctica Prydz Bay |
geographic_facet |
Amery Amery Ice Shelf Antarctic East Antarctica Prydz Bay |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Ice Shelf Ice Shelves Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Ice Shelf Ice Shelves Prydz Bay |
op_relation |
https://eprints.soton.ac.uk/398659/1/jgrc21209.pdf Herraiz-Borreguero, Laura, Coleman, Richard, Allison, Ian, Rintoul, Stephen R., Craven, Mike and Williams, Guy D. (2015) Circulation of modified Circumpolar Deep Water and basal melt beneath the Amery Ice Shelf, East Antarctica. Journal of Geophysical Research: Oceans, 120 (4), 3098-3112. (doi:10.1002/2015JC010697 <http://dx.doi.org/10.1002/2015JC010697>). |
op_doi |
https://doi.org/10.1002/2015JC010697 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
120 |
container_issue |
4 |
container_start_page |
3098 |
op_container_end_page |
3112 |
_version_ |
1772810361171345408 |