Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction
Abstract. Occupying about 14 % of the world’s surface, the Southern Ocean plays a fundamental role in ocean and atmosphere circulation, carbon cycling and Antarctic ice-sheet dynamics. Unfortunately, high interannual variability and a dearth of instrumental observations before the 1950s limits our u...
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Online Access: | http://hdl.handle.net/1959.4/unsworks_42212 https://doi.org/10.5194/cp-13-231-2017 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_42212 2024-06-02T07:58:04+00:00 Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction Turney, Chris SM Fogwill, Christopher J Palmer, Jonathan van Sebille, Erik Thomas, Zoë McGlone, Matt Richardson, Sarah Wilmshurst, Janet M Fenwick, Pavla Zunz, Violette Goosse, Hugues Wilson, Kerry-Jayne Carter, Lionel Lipson, Mathew Jones, Richard T Harsch, Melanie Clark, Graeme Marzinelli, Ezequiel Rogers, Tracey Rainsley, Eleanor Ciasto, Laura Waterman, Stephanie Thomas, Elizabeth R Visbeck, Martin 2017 http://hdl.handle.net/1959.4/unsworks_42212 https://doi.org/10.5194/cp-13-231-2017 unknown Copernicus GmbH http://purl.org/au-research/grants/arc/DP130104156 http://purl.org/au-research/grants/arc/FL100100195 https://www.clim-past.net/13/231/2017/ http://hdl.handle.net/1959.4/unsworks_42212 https://doi.org/10.5194/cp-13-231-2017 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ urn:ISSN:1814-9359 urn:ISSN:1814-9332 Climate of the Past, 13, 3, 231-248 13 Climate Action 14 Life Below Water anzsrc-for: 0406 Physical Geography and Environmental Geoscience journal article http://purl.org/coar/resource_type/c_6501 2017 ftunswworks https://doi.org/10.5194/cp-13-231-2017 2024-05-07T23:57:26Z Abstract. Occupying about 14 % of the world’s surface, the Southern Ocean plays a fundamental role in ocean and atmosphere circulation, carbon cycling and Antarctic ice-sheet dynamics. Unfortunately, high interannual variability and a dearth of instrumental observations before the 1950s limits our understanding of how marine–atmosphere–ice domains interact on multi-decadal timescales and the impact of anthropogenic forcing. Here we integrate climate-sensitive tree growth with ocean and atmospheric observations on southwest Pacific subantarctic islands that lie at the boundary of polar and subtropical climates (52–54° S). Our annually resolved temperature reconstruction captures regional change since the 1870s and demonstrates a significant increase in variability from the 1940s, a phenomenon predating the observational record. Climate reanalysis and modelling show a parallel change in tropical Pacific sea surface temperatures that generate an atmospheric Rossby wave train which propagates across a large part of the Southern Hemisphere during the austral spring and summer. Our results suggest that modern observed high interannual variability was established across the mid-twentieth century, and that the influence of contemporary equatorial Pacific temperatures may now be a permanent feature across the mid- to high latitudes. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Antarctic Austral Pacific Southern Ocean Climate of the Past 13 3 231 248 |
institution |
Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
13 Climate Action 14 Life Below Water anzsrc-for: 0406 Physical Geography and Environmental Geoscience |
spellingShingle |
13 Climate Action 14 Life Below Water anzsrc-for: 0406 Physical Geography and Environmental Geoscience Turney, Chris SM Fogwill, Christopher J Palmer, Jonathan van Sebille, Erik Thomas, Zoë McGlone, Matt Richardson, Sarah Wilmshurst, Janet M Fenwick, Pavla Zunz, Violette Goosse, Hugues Wilson, Kerry-Jayne Carter, Lionel Lipson, Mathew Jones, Richard T Harsch, Melanie Clark, Graeme Marzinelli, Ezequiel Rogers, Tracey Rainsley, Eleanor Ciasto, Laura Waterman, Stephanie Thomas, Elizabeth R Visbeck, Martin Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
topic_facet |
13 Climate Action 14 Life Below Water anzsrc-for: 0406 Physical Geography and Environmental Geoscience |
description |
Abstract. Occupying about 14 % of the world’s surface, the Southern Ocean plays a fundamental role in ocean and atmosphere circulation, carbon cycling and Antarctic ice-sheet dynamics. Unfortunately, high interannual variability and a dearth of instrumental observations before the 1950s limits our understanding of how marine–atmosphere–ice domains interact on multi-decadal timescales and the impact of anthropogenic forcing. Here we integrate climate-sensitive tree growth with ocean and atmospheric observations on southwest Pacific subantarctic islands that lie at the boundary of polar and subtropical climates (52–54° S). Our annually resolved temperature reconstruction captures regional change since the 1870s and demonstrates a significant increase in variability from the 1940s, a phenomenon predating the observational record. Climate reanalysis and modelling show a parallel change in tropical Pacific sea surface temperatures that generate an atmospheric Rossby wave train which propagates across a large part of the Southern Hemisphere during the austral spring and summer. Our results suggest that modern observed high interannual variability was established across the mid-twentieth century, and that the influence of contemporary equatorial Pacific temperatures may now be a permanent feature across the mid- to high latitudes. |
format |
Article in Journal/Newspaper |
author |
Turney, Chris SM Fogwill, Christopher J Palmer, Jonathan van Sebille, Erik Thomas, Zoë McGlone, Matt Richardson, Sarah Wilmshurst, Janet M Fenwick, Pavla Zunz, Violette Goosse, Hugues Wilson, Kerry-Jayne Carter, Lionel Lipson, Mathew Jones, Richard T Harsch, Melanie Clark, Graeme Marzinelli, Ezequiel Rogers, Tracey Rainsley, Eleanor Ciasto, Laura Waterman, Stephanie Thomas, Elizabeth R Visbeck, Martin |
author_facet |
Turney, Chris SM Fogwill, Christopher J Palmer, Jonathan van Sebille, Erik Thomas, Zoë McGlone, Matt Richardson, Sarah Wilmshurst, Janet M Fenwick, Pavla Zunz, Violette Goosse, Hugues Wilson, Kerry-Jayne Carter, Lionel Lipson, Mathew Jones, Richard T Harsch, Melanie Clark, Graeme Marzinelli, Ezequiel Rogers, Tracey Rainsley, Eleanor Ciasto, Laura Waterman, Stephanie Thomas, Elizabeth R Visbeck, Martin |
author_sort |
Turney, Chris SM |
title |
Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
title_short |
Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
title_full |
Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
title_fullStr |
Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
title_full_unstemmed |
Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
title_sort |
tropical forcing of increased southern ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
publisher |
Copernicus GmbH |
publishDate |
2017 |
url |
http://hdl.handle.net/1959.4/unsworks_42212 https://doi.org/10.5194/cp-13-231-2017 |
geographic |
Antarctic Austral Pacific Southern Ocean |
geographic_facet |
Antarctic Austral Pacific Southern Ocean |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
urn:ISSN:1814-9359 urn:ISSN:1814-9332 Climate of the Past, 13, 3, 231-248 |
op_relation |
http://purl.org/au-research/grants/arc/DP130104156 http://purl.org/au-research/grants/arc/FL100100195 https://www.clim-past.net/13/231/2017/ http://hdl.handle.net/1959.4/unsworks_42212 https://doi.org/10.5194/cp-13-231-2017 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.5194/cp-13-231-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
3 |
container_start_page |
231 |
op_container_end_page |
248 |
_version_ |
1800741328201449472 |