Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt
R.F.I. is funded by Natural Environment Research Council (NERC) grant NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC grant EP/K000225/1) and the University of Leeds Physical Climate Change Research Group high performance computi...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/13983 2023-07-02T03:30:02+02:00 Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt Ivanovic, R. F Gregoire, L. J. Wickert, A. D. Burke, A. University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry 2018-06-13T08:30:06Z 9 application/pdf http://hdl.handle.net/10023/13983 https://doi.org/10.1029/2018GL077623 eng eng Geophysical Research Letters 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 0094-8276 PURE: 253267769 PURE UUID: 255ae5b4-fb8a-4628-a5d1-4bc2bcda482c Scopus: 85048965183 WOS: 000436249900052 ORCID: /0000-0002-3754-1498/work/64034549 http://hdl.handle.net/10023/13983 https://doi.org/10.1029/2018GL077623 © 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. AMOC MWP1a Meltwater Hosing Stability Ice sheets GE Environmental Sciences DAS SDG 13 - Climate Action GE Journal article 2018 ftstandrewserep https://doi.org/10.1029/2018GL077623 2023-06-13T18:28:34Z R.F.I. is funded by Natural Environment Research Council (NERC) grant NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC grant EP/K000225/1) and the University of Leeds Physical Climate Change Research Group high performance computing resources. 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. Publisher PDF Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean University of St Andrews: Digital Research Repository Antarctic Southern Ocean The Antarctic Geophysical Research Letters 45 11 5681 5689 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
AMOC MWP1a Meltwater Hosing Stability Ice sheets GE Environmental Sciences DAS SDG 13 - Climate Action GE |
spellingShingle |
AMOC MWP1a Meltwater Hosing Stability Ice sheets GE Environmental Sciences DAS SDG 13 - Climate Action GE 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 GE Environmental Sciences DAS SDG 13 - Climate Action GE |
description |
R.F.I. is funded by Natural Environment Research Council (NERC) grant NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC grant EP/K000225/1) and the University of Leeds Physical Climate Change Research Group high performance computing resources. 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. Publisher PDF Peer reviewed |
author2 |
University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry |
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 |
http://hdl.handle.net/10023/13983 https://doi.org/10.1029/2018GL077623 |
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_relation |
Geophysical Research Letters 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 0094-8276 PURE: 253267769 PURE UUID: 255ae5b4-fb8a-4628-a5d1-4bc2bcda482c Scopus: 85048965183 WOS: 000436249900052 ORCID: /0000-0002-3754-1498/work/64034549 http://hdl.handle.net/10023/13983 https://doi.org/10.1029/2018GL077623 |
op_rights |
© 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1029/2018GL077623 |
container_title |
Geophysical Research Letters |
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45 |
container_issue |
11 |
container_start_page |
5681 |
op_container_end_page |
5689 |
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1770274297255821312 |