Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt
Records indicate that 14,500 years ago, sea level rose by 12‐22 m in under 340 years. However, the source of the sea level rise remains contentious, partly due to the competing climatic impact of different hemispheric contributions. Antarctic meltwater could indirectly strengthen the Atlantic Meridi...
Published in: | Geophysical Research Letters |
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2018
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/climatic-effect-of-antarctic-meltwater-overwhelmed-by-concurrent-northern-hemispheric-melt(255ae5b4-fb8a-4628-a5d1-4bc2bcda482c).html https://doi.org/10.1029/2018GL077623 https://research-repository.st-andrews.ac.uk/bitstream/10023/13983/1/Ivanovic_2018_GRL_Antarcticmeltwater_CC.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/255ae5b4-fb8a-4628-a5d1-4bc2bcda482c 2023-05-15T13:39:30+02:00 Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt Ivanovic, R. F Gregoire, L. J. Wickert, A. D. Burke, A. 2018-06-16 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/climatic-effect-of-antarctic-meltwater-overwhelmed-by-concurrent-northern-hemispheric-melt(255ae5b4-fb8a-4628-a5d1-4bc2bcda482c).html https://doi.org/10.1029/2018GL077623 https://research-repository.st-andrews.ac.uk/bitstream/10023/13983/1/Ivanovic_2018_GRL_Antarcticmeltwater_CC.pdf eng eng info:eu-repo/semantics/openAccess Ivanovic , R F , Gregoire , L J , Wickert , A D & Burke , A 2018 , ' Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt ' , Geophysical Research Letters , vol. 45 , no. 11 , pp. 5681-5689 . https://doi.org/10.1029/2018GL077623 AMOC MWP1a Meltwater Hosing Stability Ice sheets article 2018 ftunstandrewcris https://doi.org/10.1029/2018GL077623 2022-06-02T07:48:40Z Records indicate that 14,500 years ago, sea level rose by 12‐22 m in under 340 years. However, the source of the sea level rise remains contentious, partly due to the competing climatic impact of different hemispheric contributions. Antarctic meltwater could indirectly strengthen the Atlantic Meridional Overturning Circulation (AMOC), causing northern warming, whereas Northern Hemisphere ice‐sheet meltwater has the opposite effect. This story has recently become more intriguing, due to increasing evidence for sea level contributions from both hemispheres. Using a coupled climate model with freshwater forcing, we demonstrate that the climatic influence of southern‐sourced meltwater is overridden by northern sources even when the Antarctic flux is double the North American contribution. This is because the Southern Ocean is quickly re‐salinized by Antarctic Circumpolar water. These results imply that the pattern of surface climate changes caused by ice sheet melting cannot be used to fingerprint the hemispheric source of the meltwater. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean University of St Andrews: Research Portal Antarctic Southern Ocean The Antarctic Geophysical Research Letters 45 11 5681 5689 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
AMOC MWP1a Meltwater Hosing Stability Ice sheets |
spellingShingle |
AMOC MWP1a Meltwater Hosing Stability Ice sheets Ivanovic, R. F Gregoire, L. J. Wickert, A. D. Burke, A. Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt |
topic_facet |
AMOC MWP1a Meltwater Hosing Stability Ice sheets |
description |
Records indicate that 14,500 years ago, sea level rose by 12‐22 m in under 340 years. However, the source of the sea level rise remains contentious, partly due to the competing climatic impact of different hemispheric contributions. Antarctic meltwater could indirectly strengthen the Atlantic Meridional Overturning Circulation (AMOC), causing northern warming, whereas Northern Hemisphere ice‐sheet meltwater has the opposite effect. This story has recently become more intriguing, due to increasing evidence for sea level contributions from both hemispheres. Using a coupled climate model with freshwater forcing, we demonstrate that the climatic influence of southern‐sourced meltwater is overridden by northern sources even when the Antarctic flux is double the North American contribution. This is because the Southern Ocean is quickly re‐salinized by Antarctic Circumpolar water. These results imply that the pattern of surface climate changes caused by ice sheet melting cannot be used to fingerprint the hemispheric source of the meltwater. |
format |
Article in Journal/Newspaper |
author |
Ivanovic, R. F Gregoire, L. J. Wickert, A. D. Burke, A. |
author_facet |
Ivanovic, R. F Gregoire, L. J. Wickert, A. D. Burke, A. |
author_sort |
Ivanovic, R. F |
title |
Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt |
title_short |
Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt |
title_full |
Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt |
title_fullStr |
Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt |
title_full_unstemmed |
Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt |
title_sort |
climatic effect of antarctic meltwater overwhelmed by concurrent northern hemispheric melt |
publishDate |
2018 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/climatic-effect-of-antarctic-meltwater-overwhelmed-by-concurrent-northern-hemispheric-melt(255ae5b4-fb8a-4628-a5d1-4bc2bcda482c).html https://doi.org/10.1029/2018GL077623 https://research-repository.st-andrews.ac.uk/bitstream/10023/13983/1/Ivanovic_2018_GRL_Antarcticmeltwater_CC.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
Ivanovic , R F , Gregoire , L J , Wickert , A D & Burke , A 2018 , ' Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt ' , Geophysical Research Letters , vol. 45 , no. 11 , pp. 5681-5689 . https://doi.org/10.1029/2018GL077623 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018GL077623 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
11 |
container_start_page |
5681 |
op_container_end_page |
5689 |
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1766119676884025344 |