Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction
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 unders...
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ftdoajarticles:oai:doaj.org/article:f475d8f6464d41c58b8542768b87b2fd 2023-05-15T13:58:19+02:00 Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction C. S. M. Turney C. J. Fogwill J. G. Palmer E. van Sebille Z. Thomas M. McGlone S. Richardson J. M. Wilmshurst P. Fenwick V. Zunz H. Goosse K.-J. Wilson L. Carter M. Lipson R. T. Jones M. Harsch G. Clark E. Marzinelli T. Rogers E. Rainsley L. Ciasto S. Waterman E. R. Thomas M. Visbeck 2017-03-01T00:00:00Z https://doi.org/10.5194/cp-13-231-2017 https://doaj.org/article/f475d8f6464d41c58b8542768b87b2fd EN eng Copernicus Publications http://www.clim-past.net/13/231/2017/cp-13-231-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-13-231-2017 https://doaj.org/article/f475d8f6464d41c58b8542768b87b2fd Climate of the Past, Vol 13, Iss 3, Pp 231-248 (2017) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/cp-13-231-2017 2022-12-31T00:38:52Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic Austral Pacific Southern Ocean Climate of the Past 13 3 231 248 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. S. M. Turney C. J. Fogwill J. G. Palmer E. van Sebille Z. Thomas M. McGlone S. Richardson J. M. Wilmshurst P. Fenwick V. Zunz H. Goosse K.-J. Wilson L. Carter M. Lipson R. T. Jones M. Harsch G. Clark E. Marzinelli T. Rogers E. Rainsley L. Ciasto S. Waterman E. R. Thomas M. Visbeck Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
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 |
C. S. M. Turney C. J. Fogwill J. G. Palmer E. van Sebille Z. Thomas M. McGlone S. Richardson J. M. Wilmshurst P. Fenwick V. Zunz H. Goosse K.-J. Wilson L. Carter M. Lipson R. T. Jones M. Harsch G. Clark E. Marzinelli T. Rogers E. Rainsley L. Ciasto S. Waterman E. R. Thomas M. Visbeck |
author_facet |
C. S. M. Turney C. J. Fogwill J. G. Palmer E. van Sebille Z. Thomas M. McGlone S. Richardson J. M. Wilmshurst P. Fenwick V. Zunz H. Goosse K.-J. Wilson L. Carter M. Lipson R. T. Jones M. Harsch G. Clark E. Marzinelli T. Rogers E. Rainsley L. Ciasto S. Waterman E. R. Thomas M. Visbeck |
author_sort |
C. S. M. Turney |
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 Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-231-2017 https://doaj.org/article/f475d8f6464d41c58b8542768b87b2fd |
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 |
Climate of the Past, Vol 13, Iss 3, Pp 231-248 (2017) |
op_relation |
http://www.clim-past.net/13/231/2017/cp-13-231-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-13-231-2017 https://doaj.org/article/f475d8f6464d41c58b8542768b87b2fd |
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_ |
1766266544714678272 |