The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea
The ice shelves around the Amundsen Sea are rapidly melting as a result of the circulation of relatively warm ocean water into their cavities. However, little is known about the processes that determine the variability of this circulation. Here we use an ocean circulation model to diagnose the relat...
Published in: | Journal of Physical Oceanography |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/68755/ https://ueaeprints.uea.ac.uk/id/eprint/68755/1/Accepted_manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/68755/4/JPO_2019.pdf https://doi.org/10.1175/JPO-D-17-0213.1 |
id |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:68755 |
---|---|
record_format |
openpolar |
spelling |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:68755 2023-06-06T11:43:16+02:00 The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea Webber, Benjamin Heywood, Karen Stevens, David Assmann, Karen 2019-01 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/68755/ https://ueaeprints.uea.ac.uk/id/eprint/68755/1/Accepted_manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/68755/4/JPO_2019.pdf https://doi.org/10.1175/JPO-D-17-0213.1 en eng https://ueaeprints.uea.ac.uk/id/eprint/68755/1/Accepted_manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/68755/4/JPO_2019.pdf Webber, Benjamin, Heywood, Karen, Stevens, David and Assmann, Karen (2019) The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea. Journal of Physical Oceanography, 49 (1). pp. 63-83. ISSN 0022-3670 doi:10.1175/JPO-D-17-0213.1 cc_by Article PeerReviewed 2019 ftuniveastangl https://doi.org/10.1175/JPO-D-17-0213.1 2023-04-13T22:32:04Z The ice shelves around the Amundsen Sea are rapidly melting as a result of the circulation of relatively warm ocean water into their cavities. However, little is known about the processes that determine the variability of this circulation. Here we use an ocean circulation model to diagnose the relative importance of horizontal and vertical (overturning) circulation within Pine Island Trough, leading to Pine Island and Thwaites ice shelves. We show that melt rates and southwardCircumpolar Deep Water (CDW)transports covary over large parts of the continental shelf at interannual to decadal time scales. The dominant external forcing mechanism for this variability is Ekman pumping and suction on the continental shelf and at the shelf break, in agreementwith previous studies.At the continental shelf break, the southward transport of CDWand heat is predominantly barotropic. Farther south within Pine Island Trough, northward and southward barotropic heat transports largely cancel, and the majority of the net southward temperature transport is facilitated by baroclinic and overturning circulations. The overturning circulation is related to water mass transformation and buoyancy gain on the shelf that is primarily facilitated by freshwater input from basal melting. Article in Journal/Newspaper Amundsen Sea Ice Shelf Ice Shelves University of East Anglia: UEA Digital Repository Amundsen Sea Pine Island Trough ENVELOPE(-101.841,-101.841,-75.011,-75.011) Journal of Physical Oceanography 49 1 63 83 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
The ice shelves around the Amundsen Sea are rapidly melting as a result of the circulation of relatively warm ocean water into their cavities. However, little is known about the processes that determine the variability of this circulation. Here we use an ocean circulation model to diagnose the relative importance of horizontal and vertical (overturning) circulation within Pine Island Trough, leading to Pine Island and Thwaites ice shelves. We show that melt rates and southwardCircumpolar Deep Water (CDW)transports covary over large parts of the continental shelf at interannual to decadal time scales. The dominant external forcing mechanism for this variability is Ekman pumping and suction on the continental shelf and at the shelf break, in agreementwith previous studies.At the continental shelf break, the southward transport of CDWand heat is predominantly barotropic. Farther south within Pine Island Trough, northward and southward barotropic heat transports largely cancel, and the majority of the net southward temperature transport is facilitated by baroclinic and overturning circulations. The overturning circulation is related to water mass transformation and buoyancy gain on the shelf that is primarily facilitated by freshwater input from basal melting. |
format |
Article in Journal/Newspaper |
author |
Webber, Benjamin Heywood, Karen Stevens, David Assmann, Karen |
spellingShingle |
Webber, Benjamin Heywood, Karen Stevens, David Assmann, Karen The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea |
author_facet |
Webber, Benjamin Heywood, Karen Stevens, David Assmann, Karen |
author_sort |
Webber, Benjamin |
title |
The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea |
title_short |
The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea |
title_full |
The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea |
title_fullStr |
The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea |
title_full_unstemmed |
The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea |
title_sort |
impact of overturning and horizontal circulation in pine island trough on ice shelf melt in the eastern amundsen sea |
publishDate |
2019 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/68755/ https://ueaeprints.uea.ac.uk/id/eprint/68755/1/Accepted_manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/68755/4/JPO_2019.pdf https://doi.org/10.1175/JPO-D-17-0213.1 |
long_lat |
ENVELOPE(-101.841,-101.841,-75.011,-75.011) |
geographic |
Amundsen Sea Pine Island Trough |
geographic_facet |
Amundsen Sea Pine Island Trough |
genre |
Amundsen Sea Ice Shelf Ice Shelves |
genre_facet |
Amundsen Sea Ice Shelf Ice Shelves |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/68755/1/Accepted_manuscript.pdf https://ueaeprints.uea.ac.uk/id/eprint/68755/4/JPO_2019.pdf Webber, Benjamin, Heywood, Karen, Stevens, David and Assmann, Karen (2019) The impact of overturning and horizontal circulation in Pine Island Trough on ice shelf melt in the eastern Amundsen Sea. Journal of Physical Oceanography, 49 (1). pp. 63-83. ISSN 0022-3670 doi:10.1175/JPO-D-17-0213.1 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.1175/JPO-D-17-0213.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
1 |
container_start_page |
63 |
op_container_end_page |
83 |
_version_ |
1767953962704568320 |