Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers
A crucial factor influencing the mass balance of the West Antarctic Ice Sheet is the Amundsen Sea Low (ASL), a climatological low-pressure region situated off the West Antarctic coast. However, albeit the deepening of the ASL since the 1950s has been attributed to anthropogenic forcing, the multi-de...
Published in: | Geophysical Research Letters |
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American Geophysical Union
2024
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Online Access: | http://nora.nerc.ac.uk/id/eprint/537878/ https://nora.nerc.ac.uk/id/eprint/537878/1/Geophysical%20Research%20Letters%20-%202024%20-%20Dalaiden%20-%20Multi%E2%80%90Decadal%20Variability%20of%20Amundsen%20Sea%20Low%20Controlled%20by%20Natural.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL109137 |
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ftnerc:oai:nora.nerc.ac.uk:537878 2024-09-15T17:39:01+00:00 Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers Dalaiden, Quentin Abram, Nerilie J. Goosse, Hugues Holland, Paul R. O'Connor, Gemma K. Topál, Dániel 2024-08-15 text http://nora.nerc.ac.uk/id/eprint/537878/ https://nora.nerc.ac.uk/id/eprint/537878/1/Geophysical%20Research%20Letters%20-%202024%20-%20Dalaiden%20-%20Multi%E2%80%90Decadal%20Variability%20of%20Amundsen%20Sea%20Low%20Controlled%20by%20Natural.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL109137 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/537878/1/Geophysical%20Research%20Letters%20-%202024%20-%20Dalaiden%20-%20Multi%E2%80%90Decadal%20Variability%20of%20Amundsen%20Sea%20Low%20Controlled%20by%20Natural.pdf Dalaiden, Quentin; Abram, Nerilie J.; Goosse, Hugues; Holland, Paul R. orcid:0000-0001-8370-289X O'Connor, Gemma K.; Topál, Dániel. 2024 Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers. Geophysical Research Letters, 51 (16), e2024GL109137. 13, pp. https://doi.org/10.1029/2024GL109137 <https://doi.org/10.1029/2024GL109137> cc_by_4 Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1029/2024GL109137 2024-08-27T23:40:53Z A crucial factor influencing the mass balance of the West Antarctic Ice Sheet is the Amundsen Sea Low (ASL), a climatological low-pressure region situated off the West Antarctic coast. However, albeit the deepening of the ASL since the 1950s has been attributed to anthropogenic forcing, the multi-decadal variability of the ASL remains poorly understood, because of a lack of long observations. Here, we apply a newly developed data assimilation method to reconstruct the ASL over 1870–2000. We study the forced and internal variability of the ASL using our new reconstruction in concert with existing large ensembles of climate model simulations. Our findings robustly demonstrate that an atmospheric teleconnection originating from the tropical Indo-Pacific is the main driver of ASL variability at the multi-decadal time scale, with resemblance to the Interdecadal Pacific Oscillation. Since the mid-20th century, anthropogenic forcing has emerged as a dominant contributor to the strengthening of the ASL. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Natural Environment Research Council: NERC Open Research Archive Geophysical Research Letters 51 16 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
A crucial factor influencing the mass balance of the West Antarctic Ice Sheet is the Amundsen Sea Low (ASL), a climatological low-pressure region situated off the West Antarctic coast. However, albeit the deepening of the ASL since the 1950s has been attributed to anthropogenic forcing, the multi-decadal variability of the ASL remains poorly understood, because of a lack of long observations. Here, we apply a newly developed data assimilation method to reconstruct the ASL over 1870–2000. We study the forced and internal variability of the ASL using our new reconstruction in concert with existing large ensembles of climate model simulations. Our findings robustly demonstrate that an atmospheric teleconnection originating from the tropical Indo-Pacific is the main driver of ASL variability at the multi-decadal time scale, with resemblance to the Interdecadal Pacific Oscillation. Since the mid-20th century, anthropogenic forcing has emerged as a dominant contributor to the strengthening of the ASL. |
format |
Article in Journal/Newspaper |
author |
Dalaiden, Quentin Abram, Nerilie J. Goosse, Hugues Holland, Paul R. O'Connor, Gemma K. Topál, Dániel |
spellingShingle |
Dalaiden, Quentin Abram, Nerilie J. Goosse, Hugues Holland, Paul R. O'Connor, Gemma K. Topál, Dániel Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers |
author_facet |
Dalaiden, Quentin Abram, Nerilie J. Goosse, Hugues Holland, Paul R. O'Connor, Gemma K. Topál, Dániel |
author_sort |
Dalaiden, Quentin |
title |
Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers |
title_short |
Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers |
title_full |
Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers |
title_fullStr |
Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers |
title_full_unstemmed |
Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers |
title_sort |
multi-decadal variability of amundsen sea low controlled by natural tropical and anthropogenic drivers |
publisher |
American Geophysical Union |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/537878/ https://nora.nerc.ac.uk/id/eprint/537878/1/Geophysical%20Research%20Letters%20-%202024%20-%20Dalaiden%20-%20Multi%E2%80%90Decadal%20Variability%20of%20Amundsen%20Sea%20Low%20Controlled%20by%20Natural.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL109137 |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/537878/1/Geophysical%20Research%20Letters%20-%202024%20-%20Dalaiden%20-%20Multi%E2%80%90Decadal%20Variability%20of%20Amundsen%20Sea%20Low%20Controlled%20by%20Natural.pdf Dalaiden, Quentin; Abram, Nerilie J.; Goosse, Hugues; Holland, Paul R. orcid:0000-0001-8370-289X O'Connor, Gemma K.; Topál, Dániel. 2024 Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers. Geophysical Research Letters, 51 (16), e2024GL109137. 13, pp. https://doi.org/10.1029/2024GL109137 <https://doi.org/10.1029/2024GL109137> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1029/2024GL109137 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
16 |
_version_ |
1810476914691801088 |