Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene
Centennial and millennial scale variability of Southern Ocean temperature is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variability instead coming mainly from ice core records. Here we...
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Copernicus GmbH
2020
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ftarchimer:oai:archimer.ifremer.fr:74327 2023-05-15T16:39:17+02:00 Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene Orme, Lise C Crosta, Xavier Miettinen, Arto Divine, Dmitry V Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru 2020-08 application/pdf https://archimer.ifremer.fr/doc/00631/74327/73963.pdf https://archimer.ifremer.fr/doc/00631/74327/76616.pdf https://archimer.ifremer.fr/doc/00631/74327/76617.pdf https://doi.org/10.5194/cp-16-1451-2020 https://archimer.ifremer.fr/doc/00631/74327/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00631/74327/73963.pdf https://archimer.ifremer.fr/doc/00631/74327/76616.pdf https://archimer.ifremer.fr/doc/00631/74327/76617.pdf doi:10.5194/cp-16-1451-2020 https://archimer.ifremer.fr/doc/00631/74327/ info:eu-repo/semantics/openAccess restricted use Climate Of The Past (1814-9324) (Copernicus GmbH), 2020-08 , Vol. 16 , N. 4 , P. 1451-1467 text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.5194/cp-16-1451-2020 2021-09-23T20:35:14Z Centennial and millennial scale variability of Southern Ocean temperature is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variability instead coming mainly from ice core records. Here we present a high-resolution (~ 60 year), diatom-based sea-surface temperature (SST) reconstruction from the western Indian sector of the Southern Ocean that spans the interval 14.2 to 1.0 ka BP (calibrated kiloyears before present). During the late deglaciation, the new SST record shows cool temperatures at 14.2–12.9 ka BP and gradual warming between 12.9–11.6 ka BP in phase with atmospheric temperature evolution. This supports that the temperature of the Southern Ocean during the deglaciation was linked with a complex combination of processes and drivers associated with reorganisations of atmospheric and oceanic circulation patterns. Specifically, we suggest that Southern Ocean surface warming coincided, within the dating uncertainties, with the reconstructed slowdown of the Atlantic Meridional Overturning Circulation (AMOC), rising atmospheric CO2 levels, changes in the southern westerly winds and enhanced upwelling. During the Holocene the record shows warm and stable temperatures from 11.6–8.7 ka BP followed by a slight cooling and greater variability from 8.7 to 1 ka BP, with a quasi-periodic variability of 200–260 years as identified by spectral analysis. We suggest that the increased variability during the mid to late Holocene may reflect the establishment of centennial variability in SST connected with changes in the high latitude atmospheric circulation and Southern Ocean convection, as identified in models. Article in Journal/Newspaper ice core Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Southern Ocean Climate of the Past 16 4 1451 1467 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Centennial and millennial scale variability of Southern Ocean temperature is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variability instead coming mainly from ice core records. Here we present a high-resolution (~ 60 year), diatom-based sea-surface temperature (SST) reconstruction from the western Indian sector of the Southern Ocean that spans the interval 14.2 to 1.0 ka BP (calibrated kiloyears before present). During the late deglaciation, the new SST record shows cool temperatures at 14.2–12.9 ka BP and gradual warming between 12.9–11.6 ka BP in phase with atmospheric temperature evolution. This supports that the temperature of the Southern Ocean during the deglaciation was linked with a complex combination of processes and drivers associated with reorganisations of atmospheric and oceanic circulation patterns. Specifically, we suggest that Southern Ocean surface warming coincided, within the dating uncertainties, with the reconstructed slowdown of the Atlantic Meridional Overturning Circulation (AMOC), rising atmospheric CO2 levels, changes in the southern westerly winds and enhanced upwelling. During the Holocene the record shows warm and stable temperatures from 11.6–8.7 ka BP followed by a slight cooling and greater variability from 8.7 to 1 ka BP, with a quasi-periodic variability of 200–260 years as identified by spectral analysis. We suggest that the increased variability during the mid to late Holocene may reflect the establishment of centennial variability in SST connected with changes in the high latitude atmospheric circulation and Southern Ocean convection, as identified in models. |
format |
Article in Journal/Newspaper |
author |
Orme, Lise C Crosta, Xavier Miettinen, Arto Divine, Dmitry V Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru |
spellingShingle |
Orme, Lise C Crosta, Xavier Miettinen, Arto Divine, Dmitry V Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene |
author_facet |
Orme, Lise C Crosta, Xavier Miettinen, Arto Divine, Dmitry V Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru |
author_sort |
Orme, Lise C |
title |
Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene |
title_short |
Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene |
title_full |
Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene |
title_fullStr |
Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene |
title_full_unstemmed |
Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene |
title_sort |
sea surface temperature in the indian sector of the southern ocean over the late glacial and holocene |
publisher |
Copernicus GmbH |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00631/74327/73963.pdf https://archimer.ifremer.fr/doc/00631/74327/76616.pdf https://archimer.ifremer.fr/doc/00631/74327/76617.pdf https://doi.org/10.5194/cp-16-1451-2020 https://archimer.ifremer.fr/doc/00631/74327/ |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
ice core Southern Ocean |
genre_facet |
ice core Southern Ocean |
op_source |
Climate Of The Past (1814-9324) (Copernicus GmbH), 2020-08 , Vol. 16 , N. 4 , P. 1451-1467 |
op_relation |
https://archimer.ifremer.fr/doc/00631/74327/73963.pdf https://archimer.ifremer.fr/doc/00631/74327/76616.pdf https://archimer.ifremer.fr/doc/00631/74327/76617.pdf doi:10.5194/cp-16-1451-2020 https://archimer.ifremer.fr/doc/00631/74327/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/cp-16-1451-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
4 |
container_start_page |
1451 |
op_container_end_page |
1467 |
_version_ |
1766029621076164608 |