Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise
The early part of the last deglaciation is characterised by a ~40 ppm atmospheric CO2 rise occurring in two abrupt phases. The underlying mechanisms driving these increases remain a subject of intense debate. Here, we successfully reproduce changes in CO2, δ 13C and Δ14C as recorded by paleo-records...
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_58892 2024-05-19T07:29:38+00:00 Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise Menviel, L Spence, P Yu, J Chamberlain, MA Matear, RJ Meissner, KJ England, MH 2018-12-01 application/pdf http://hdl.handle.net/1959.4/unsworks_58892 https://unsworks.unsw.edu.au/bitstreams/de23a2b9-9dd1-497b-8b4c-72dca3f8d541/download https://doi.org/10.1038/s41467-018-04876-4 unknown Springer Nature http://purl.org/au-research/grants/arc/DP180100048 http://hdl.handle.net/1959.4/unsworks_58892 https://unsworks.unsw.edu.au/bitstreams/de23a2b9-9dd1-497b-8b4c-72dca3f8d541/download https://doi.org/10.1038/s41467-018-04876-4 open access https://purl.org/coar/access_right/c_abf2 CC BY https://creativecommons.org/licenses/by/4.0/ free_to_read urn:ISSN:2041-1723 Nature Communications, 9, 1, 2503 13 Climate Action journal article http://purl.org/coar/resource_type/c_6501 2018 ftunswworks https://doi.org/10.1038/s41467-018-04876-4 2024-04-30T23:57:38Z The early part of the last deglaciation is characterised by a ~40 ppm atmospheric CO2 rise occurring in two abrupt phases. The underlying mechanisms driving these increases remain a subject of intense debate. Here, we successfully reproduce changes in CO2, δ 13C and Δ14C as recorded by paleo-records during Heinrich stadial 1 (HS1). We show that HS1 CO2 increase can be explained by enhanced Southern Ocean upwelling of carbon-rich Pacific deep and intermediate waters, resulting from intensified Southern Ocean convection and Southern Hemisphere (SH) westerlies. While enhanced Antarctic Bottom Water formation leads to a millennial CO2 outgassing, intensified SH westerlies induce a multi-decadal atmospheric CO2 rise. A strengthening of SH westerlies in a global eddy-permitting ocean model further supports a multi-decadal CO2 outgassing from the Southern Ocean. Our results highlight the crucial role of SH westerlies in the global climate and carbon cycle system with important implications for future climate projections. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Nature Communications 9 1 |
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Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
13 Climate Action |
spellingShingle |
13 Climate Action Menviel, L Spence, P Yu, J Chamberlain, MA Matear, RJ Meissner, KJ England, MH Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise |
topic_facet |
13 Climate Action |
description |
The early part of the last deglaciation is characterised by a ~40 ppm atmospheric CO2 rise occurring in two abrupt phases. The underlying mechanisms driving these increases remain a subject of intense debate. Here, we successfully reproduce changes in CO2, δ 13C and Δ14C as recorded by paleo-records during Heinrich stadial 1 (HS1). We show that HS1 CO2 increase can be explained by enhanced Southern Ocean upwelling of carbon-rich Pacific deep and intermediate waters, resulting from intensified Southern Ocean convection and Southern Hemisphere (SH) westerlies. While enhanced Antarctic Bottom Water formation leads to a millennial CO2 outgassing, intensified SH westerlies induce a multi-decadal atmospheric CO2 rise. A strengthening of SH westerlies in a global eddy-permitting ocean model further supports a multi-decadal CO2 outgassing from the Southern Ocean. Our results highlight the crucial role of SH westerlies in the global climate and carbon cycle system with important implications for future climate projections. |
format |
Article in Journal/Newspaper |
author |
Menviel, L Spence, P Yu, J Chamberlain, MA Matear, RJ Meissner, KJ England, MH |
author_facet |
Menviel, L Spence, P Yu, J Chamberlain, MA Matear, RJ Meissner, KJ England, MH |
author_sort |
Menviel, L |
title |
Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise |
title_short |
Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise |
title_full |
Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise |
title_fullStr |
Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise |
title_full_unstemmed |
Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise |
title_sort |
southern hemisphere westerlies as a driver of the early deglacial atmospheric co 2 rise |
publisher |
Springer Nature |
publishDate |
2018 |
url |
http://hdl.handle.net/1959.4/unsworks_58892 https://unsworks.unsw.edu.au/bitstreams/de23a2b9-9dd1-497b-8b4c-72dca3f8d541/download https://doi.org/10.1038/s41467-018-04876-4 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
urn:ISSN:2041-1723 Nature Communications, 9, 1, 2503 |
op_relation |
http://purl.org/au-research/grants/arc/DP180100048 http://hdl.handle.net/1959.4/unsworks_58892 https://unsworks.unsw.edu.au/bitstreams/de23a2b9-9dd1-497b-8b4c-72dca3f8d541/download https://doi.org/10.1038/s41467-018-04876-4 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC BY https://creativecommons.org/licenses/by/4.0/ free_to_read |
op_doi |
https://doi.org/10.1038/s41467-018-04876-4 |
container_title |
Nature Communications |
container_volume |
9 |
container_issue |
1 |
_version_ |
1799480417272725504 |