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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Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
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Online Access: | http://nora.nerc.ac.uk/id/eprint/533728/ https://nora.nerc.ac.uk/id/eprint/533728/1/Geophysical%20Research%20Letters%20-%202022%20-%20Silvano%20-%20Baroclinic%20Ocean%20Response%20to%20Climate%20Forcing%20Regulates%20Decadal%20Variability.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022GL100646 |
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ftnerc:oai:nora.nerc.ac.uk:533728 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. Dotto, Tiago S. Naveira Garabato, Alberto C. 2022-12-28 text http://nora.nerc.ac.uk/id/eprint/533728/ https://nora.nerc.ac.uk/id/eprint/533728/1/Geophysical%20Research%20Letters%20-%202022%20-%20Silvano%20-%20Baroclinic%20Ocean%20Response%20to%20Climate%20Forcing%20Regulates%20Decadal%20Variability.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022GL100646 en eng Wiley https://nora.nerc.ac.uk/id/eprint/533728/1/Geophysical%20Research%20Letters%20-%202022%20-%20Silvano%20-%20Baroclinic%20Ocean%20Response%20to%20Climate%20Forcing%20Regulates%20Decadal%20Variability.pdf Silvano, Alessandro; Holland, Paul R. orcid:0000-0001-8370-289X Naughten, Kaitlin A. orcid:0000-0001-9475-9162 Dragomir, Oana; Dutrieux, Pierre orcid:0000-0002-8066-934X Jenkins, Adrian; Si, Yidongfang; Stewart, Andrew L.; Peña Molino, Beatriz; Janzing, Gregor W.; Dotto, Tiago S.; 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), e2022GL100646. 10, pp. https://doi.org/10.1029/2022GL100646 <https://doi.org/10.1029/2022GL100646> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1029/2022GL100646 2023-02-04T19:53:52Z 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 Natural Environment Research Council: NERC Open Research Archive Amundsen Sea Pacific Geophysical Research Letters 49 24 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
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. Dotto, Tiago S. 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. Dotto, Tiago S. 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. Dotto, Tiago S. 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 |
publisher |
Wiley |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/533728/ https://nora.nerc.ac.uk/id/eprint/533728/1/Geophysical%20Research%20Letters%20-%202022%20-%20Silvano%20-%20Baroclinic%20Ocean%20Response%20to%20Climate%20Forcing%20Regulates%20Decadal%20Variability.pdf https://agupubs.onlinelibrary.wiley.com/doi/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://nora.nerc.ac.uk/id/eprint/533728/1/Geophysical%20Research%20Letters%20-%202022%20-%20Silvano%20-%20Baroclinic%20Ocean%20Response%20to%20Climate%20Forcing%20Regulates%20Decadal%20Variability.pdf Silvano, Alessandro; Holland, Paul R. orcid:0000-0001-8370-289X Naughten, Kaitlin A. orcid:0000-0001-9475-9162 Dragomir, Oana; Dutrieux, Pierre orcid:0000-0002-8066-934X Jenkins, Adrian; Si, Yidongfang; Stewart, Andrew L.; Peña Molino, Beatriz; Janzing, Gregor W.; Dotto, Tiago S.; 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), e2022GL100646. 10, pp. https://doi.org/10.1029/2022GL100646 <https://doi.org/10.1029/2022GL100646> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2022GL100646 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
24 |
_version_ |
1766372838471630848 |