Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea
Warm ocean waters drive rapid ice-shelf melting in the Amundsen Sea. The ocean heat transport toward the ice shelves is associated with the Amundsen Undercurrent, a near-bottom current that flows eastward along the shelf break and transports warm waters onto the continental shelf via troughs. Here w...
Published in: | Geophysical Research Letters |
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2022
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Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/90245/ https://ueaeprints.uea.ac.uk/id/eprint/90245/1/Geophysical_Research_Letters_2022_Silvano_Baroclinic_Ocean_Response_to_Climate_Forcing_Regulates_Decadal_Variability.pdf https://doi.org/10.1029/2022GL100646 |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:90245 2023-05-15T13:23:31+02:00 Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea Silvano, Alessandro Holland, Paul R. Naughten, Kaitlin A. Dragomir, Oana Dutrieux, Pierre Jenkins, Adrian Si, Yidongfang Stewart, Andrew L. Peña Molino, Beatriz Janzing, Gregor W. S. Dotto, Tiago Naveira Garabato, Alberto C. 2022-12-28 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/90245/ https://ueaeprints.uea.ac.uk/id/eprint/90245/1/Geophysical_Research_Letters_2022_Silvano_Baroclinic_Ocean_Response_to_Climate_Forcing_Regulates_Decadal_Variability.pdf https://doi.org/10.1029/2022GL100646 en eng https://ueaeprints.uea.ac.uk/id/eprint/90245/1/Geophysical_Research_Letters_2022_Silvano_Baroclinic_Ocean_Response_to_Climate_Forcing_Regulates_Decadal_Variability.pdf Silvano, Alessandro, Holland, Paul R., Naughten, Kaitlin A., Dragomir, Oana, Dutrieux, Pierre, Jenkins, Adrian, Si, Yidongfang, Stewart, Andrew L., Peña Molino, Beatriz, Janzing, Gregor W., S. Dotto, Tiago and Naveira Garabato, Alberto C. (2022) Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea. Geophysical Research Letters, 49 (24). ISSN 0094-8276 doi:10.1029/2022GL100646 cc_by CC-BY Article PeerReviewed 2022 ftuniveastangl https://doi.org/10.1029/2022GL100646 2023-01-30T21:58:56Z Warm ocean waters drive rapid ice-shelf melting in the Amundsen Sea. The ocean heat transport toward the ice shelves is associated with the Amundsen Undercurrent, a near-bottom current that flows eastward along the shelf break and transports warm waters onto the continental shelf via troughs. Here we use a regional ice-ocean model to show that, on decadal time scales, the undercurrent's variability is baroclinic (depth-dependent). Decadal ocean surface cooling in the tropical Pacific results in cyclonic wind anomalies over the Amundsen Sea. These wind anomalies drive a westward perturbation of the shelf-break surface flow and an eastward anomaly (strengthening) of the undercurrent, leading to increased ice-shelf melting. This contrasts with shorter time scales, for which surface current and undercurrent covary, a barotropic (depth-independent) behavior previously assumed to apply at all time scales. This suggests that interior ocean processes mediate the decadal ice-shelf response in the Amundsen Sea to climate forcing. Article in Journal/Newspaper Amundsen Sea Ice Shelf Ice Shelves University of East Anglia: UEA Digital Repository Amundsen Sea Pacific Geophysical Research Letters 49 24 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
Warm ocean waters drive rapid ice-shelf melting in the Amundsen Sea. The ocean heat transport toward the ice shelves is associated with the Amundsen Undercurrent, a near-bottom current that flows eastward along the shelf break and transports warm waters onto the continental shelf via troughs. Here we use a regional ice-ocean model to show that, on decadal time scales, the undercurrent's variability is baroclinic (depth-dependent). Decadal ocean surface cooling in the tropical Pacific results in cyclonic wind anomalies over the Amundsen Sea. These wind anomalies drive a westward perturbation of the shelf-break surface flow and an eastward anomaly (strengthening) of the undercurrent, leading to increased ice-shelf melting. This contrasts with shorter time scales, for which surface current and undercurrent covary, a barotropic (depth-independent) behavior previously assumed to apply at all time scales. This suggests that interior ocean processes mediate the decadal ice-shelf response in the Amundsen Sea to climate forcing. |
format |
Article in Journal/Newspaper |
author |
Silvano, Alessandro Holland, Paul R. Naughten, Kaitlin A. Dragomir, Oana Dutrieux, Pierre Jenkins, Adrian Si, Yidongfang Stewart, Andrew L. Peña Molino, Beatriz Janzing, Gregor W. S. Dotto, Tiago Naveira Garabato, Alberto C. |
spellingShingle |
Silvano, Alessandro Holland, Paul R. Naughten, Kaitlin A. Dragomir, Oana Dutrieux, Pierre Jenkins, Adrian Si, Yidongfang Stewart, Andrew L. Peña Molino, Beatriz Janzing, Gregor W. S. Dotto, Tiago Naveira Garabato, Alberto C. Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea |
author_facet |
Silvano, Alessandro Holland, Paul R. Naughten, Kaitlin A. Dragomir, Oana Dutrieux, Pierre Jenkins, Adrian Si, Yidongfang Stewart, Andrew L. Peña Molino, Beatriz Janzing, Gregor W. S. Dotto, Tiago Naveira Garabato, Alberto C. |
author_sort |
Silvano, Alessandro |
title |
Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea |
title_short |
Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea |
title_full |
Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea |
title_fullStr |
Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea |
title_full_unstemmed |
Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea |
title_sort |
baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the amundsen sea |
publishDate |
2022 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/90245/ https://ueaeprints.uea.ac.uk/id/eprint/90245/1/Geophysical_Research_Letters_2022_Silvano_Baroclinic_Ocean_Response_to_Climate_Forcing_Regulates_Decadal_Variability.pdf https://doi.org/10.1029/2022GL100646 |
geographic |
Amundsen Sea Pacific |
geographic_facet |
Amundsen Sea Pacific |
genre |
Amundsen Sea Ice Shelf Ice Shelves |
genre_facet |
Amundsen Sea Ice Shelf Ice Shelves |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/90245/1/Geophysical_Research_Letters_2022_Silvano_Baroclinic_Ocean_Response_to_Climate_Forcing_Regulates_Decadal_Variability.pdf Silvano, Alessandro, Holland, Paul R., Naughten, Kaitlin A., Dragomir, Oana, Dutrieux, Pierre, Jenkins, Adrian, Si, Yidongfang, Stewart, Andrew L., Peña Molino, Beatriz, Janzing, Gregor W., S. Dotto, Tiago and Naveira Garabato, Alberto C. (2022) Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea. Geophysical Research Letters, 49 (24). ISSN 0094-8276 doi:10.1029/2022GL100646 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2022GL100646 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
24 |
_version_ |
1766372836042080256 |