Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation
North Pacific atmospheric and oceanic circulations are key missing pieces in our understanding of the reorganisation of the global climate system since the Last Glacial Maximum (LGM). Here, using a basin‐wide compilation of planktic foraminiferal δ 18 O, we show that the North Pacific subpolar gyre...
Published in: | Geophysical Research Letters |
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2020
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Online Access: | https://research-portal.st-andrews.ac.uk/en/publications/59536cf2-40d3-4a79-9607-d58672d1c08e https://doi.org/10.1029/2019GL086328 https://research-repository.st-andrews.ac.uk/bitstream/10023/21638/1/Gray_2020_GRL_Wind_drivenevolution_VoR.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/59536cf2-40d3-4a79-9607-d58672d1c08e 2024-10-06T13:49:34+00:00 Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation Gray, William Robert Wills, Robert CJ Rae, James William Buchanan Burke, Andrea Ivanovic, Ruza F Roberts, William HG Ferreira, David Valdes, Paul J 2020-03-17 application/pdf https://research-portal.st-andrews.ac.uk/en/publications/59536cf2-40d3-4a79-9607-d58672d1c08e https://doi.org/10.1029/2019GL086328 https://research-repository.st-andrews.ac.uk/bitstream/10023/21638/1/Gray_2020_GRL_Wind_drivenevolution_VoR.pdf eng eng https://research-portal.st-andrews.ac.uk/en/publications/59536cf2-40d3-4a79-9607-d58672d1c08e info:eu-repo/semantics/openAccess Gray , W R , Wills , R CJ , Rae , J W B , Burke , A , Ivanovic , R F , Roberts , W HG , Ferreira , D & Valdes , P J 2020 , ' Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation ' , Geophysical Research Letters , vol. 47 , no. 6 , e2019GL086328 . https://doi.org/10.1029/2019GL086328 North Pacific Deglaciation Gyre circulation Westerlies Oxygen isotopes Climate models article 2020 ftunstandrewcris https://doi.org/10.1029/2019GL086328 2024-09-11T23:41:06Z North Pacific atmospheric and oceanic circulations are key missing pieces in our understanding of the reorganisation of the global climate system since the Last Glacial Maximum (LGM). Here, using a basin‐wide compilation of planktic foraminiferal δ 18 O, we show that the North Pacific subpolar gyre extended ~3° further south during the LGM, consistent with sea surface temperature and productivity proxy data. Climate models indicate that the expansion of the subpolar gyre was associated with a substantial gyre strengthening, and that these gyre circulation changes were driven by a southward shift of the mid‐latitude westerlies and increased wind‐stress from the polar easterlies. Using single‐forcing model runs, we show that these atmospheric circulation changes are a non‐linear response to ice‐sheet topography/albedo, and CO 2 . Our reconstruction indicates that the gyre boundary (and thus westerly winds) began to migrate northward at ~16.5 ka, driving changes in ocean heat transport, biogeochemistry, and North American hydroclimate. Article in Journal/Newspaper Ice Sheet University of St Andrews: Research Portal Pacific Geophysical Research Letters 47 6 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
North Pacific Deglaciation Gyre circulation Westerlies Oxygen isotopes Climate models |
spellingShingle |
North Pacific Deglaciation Gyre circulation Westerlies Oxygen isotopes Climate models Gray, William Robert Wills, Robert CJ Rae, James William Buchanan Burke, Andrea Ivanovic, Ruza F Roberts, William HG Ferreira, David Valdes, Paul J Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation |
topic_facet |
North Pacific Deglaciation Gyre circulation Westerlies Oxygen isotopes Climate models |
description |
North Pacific atmospheric and oceanic circulations are key missing pieces in our understanding of the reorganisation of the global climate system since the Last Glacial Maximum (LGM). Here, using a basin‐wide compilation of planktic foraminiferal δ 18 O, we show that the North Pacific subpolar gyre extended ~3° further south during the LGM, consistent with sea surface temperature and productivity proxy data. Climate models indicate that the expansion of the subpolar gyre was associated with a substantial gyre strengthening, and that these gyre circulation changes were driven by a southward shift of the mid‐latitude westerlies and increased wind‐stress from the polar easterlies. Using single‐forcing model runs, we show that these atmospheric circulation changes are a non‐linear response to ice‐sheet topography/albedo, and CO 2 . Our reconstruction indicates that the gyre boundary (and thus westerly winds) began to migrate northward at ~16.5 ka, driving changes in ocean heat transport, biogeochemistry, and North American hydroclimate. |
format |
Article in Journal/Newspaper |
author |
Gray, William Robert Wills, Robert CJ Rae, James William Buchanan Burke, Andrea Ivanovic, Ruza F Roberts, William HG Ferreira, David Valdes, Paul J |
author_facet |
Gray, William Robert Wills, Robert CJ Rae, James William Buchanan Burke, Andrea Ivanovic, Ruza F Roberts, William HG Ferreira, David Valdes, Paul J |
author_sort |
Gray, William Robert |
title |
Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation |
title_short |
Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation |
title_full |
Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation |
title_fullStr |
Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation |
title_full_unstemmed |
Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation |
title_sort |
wind-driven evolution of the north pacific subpolar gyre over the last deglaciation |
publishDate |
2020 |
url |
https://research-portal.st-andrews.ac.uk/en/publications/59536cf2-40d3-4a79-9607-d58672d1c08e https://doi.org/10.1029/2019GL086328 https://research-repository.st-andrews.ac.uk/bitstream/10023/21638/1/Gray_2020_GRL_Wind_drivenevolution_VoR.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Gray , W R , Wills , R CJ , Rae , J W B , Burke , A , Ivanovic , R F , Roberts , W HG , Ferreira , D & Valdes , P J 2020 , ' Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation ' , Geophysical Research Letters , vol. 47 , no. 6 , e2019GL086328 . https://doi.org/10.1029/2019GL086328 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/publications/59536cf2-40d3-4a79-9607-d58672d1c08e |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019GL086328 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
6 |
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1812177646440677376 |