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...
Published in: | Climate of the Past |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications (EGU)
2017
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Online Access: | https://oceanrep.geomar.de/id/eprint/37117/ https://oceanrep.geomar.de/id/eprint/37117/1/cp-13-231-2017.pdf https://oceanrep.geomar.de/id/eprint/37117/2/cp-13-231-2017-supplement.pdf https://doi.org/10.5194/cp-13-231-2017 |
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ftoceanrep:oai:oceanrep.geomar.de:37117 2023-05-15T13:40:31+02:00 Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction Turney, Chris S. M. Fogwill, Christopher J. Palmer, Jonathan G. 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 2017-03-15 text https://oceanrep.geomar.de/id/eprint/37117/ https://oceanrep.geomar.de/id/eprint/37117/1/cp-13-231-2017.pdf https://oceanrep.geomar.de/id/eprint/37117/2/cp-13-231-2017-supplement.pdf https://doi.org/10.5194/cp-13-231-2017 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/37117/1/cp-13-231-2017.pdf https://oceanrep.geomar.de/id/eprint/37117/2/cp-13-231-2017-supplement.pdf Turney, C. S. M., Fogwill, C. J., Palmer, J. G., van Sebille, E., Thomas, Z., McGlone, M., Richardson, S., Wilmshurst, J. M., Fenwick, P., Zunz, V., Goosse, H., Wilson, K. J., Carter, L., Lipson, M., Jones, R. T., Harsch, M., Clark, G., Marzinelli, E., Rogers, T., Rainsley, E., Ciasto, L., Waterman, S., Thomas, E. R. and Visbeck, M. (2017) Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction. Open Access Climate of the Past, 13 (3). pp. 231-248. DOI 10.5194/cp-13-231-2017 <https://doi.org/10.5194/cp-13-231-2017>. doi:10.5194/cp-13-231-2017 cc_by_3.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.5194/cp-13-231-2017 2023-04-07T15:32:05Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Southern Ocean Austral Pacific Climate of the Past 13 3 231 248 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
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 |
Turney, Chris S. M. Fogwill, Christopher J. Palmer, Jonathan G. 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 |
spellingShingle |
Turney, Chris S. M. Fogwill, Christopher J. Palmer, Jonathan G. 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 |
author_facet |
Turney, Chris S. M. Fogwill, Christopher J. Palmer, Jonathan G. 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 S. M. |
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 (EGU) |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/37117/ https://oceanrep.geomar.de/id/eprint/37117/1/cp-13-231-2017.pdf https://oceanrep.geomar.de/id/eprint/37117/2/cp-13-231-2017-supplement.pdf https://doi.org/10.5194/cp-13-231-2017 |
geographic |
Antarctic Southern Ocean Austral Pacific |
geographic_facet |
Antarctic Southern Ocean Austral Pacific |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/37117/1/cp-13-231-2017.pdf https://oceanrep.geomar.de/id/eprint/37117/2/cp-13-231-2017-supplement.pdf Turney, C. S. M., Fogwill, C. J., Palmer, J. G., van Sebille, E., Thomas, Z., McGlone, M., Richardson, S., Wilmshurst, J. M., Fenwick, P., Zunz, V., Goosse, H., Wilson, K. J., Carter, L., Lipson, M., Jones, R. T., Harsch, M., Clark, G., Marzinelli, E., Rogers, T., Rainsley, E., Ciasto, L., Waterman, S., Thomas, E. R. and Visbeck, M. (2017) Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction. Open Access Climate of the Past, 13 (3). pp. 231-248. DOI 10.5194/cp-13-231-2017 <https://doi.org/10.5194/cp-13-231-2017>. doi:10.5194/cp-13-231-2017 |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
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 |
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1766136371730186240 |