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 over the Holocene is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variations in the region coming mainly from ic...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/319322 2024-01-07T09:38:48+01:00 Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene Orme, Lisa Claire Crosta, Xavier Miettinen, Arto Divine, Dmitry Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru Ecosystems and Environment Research Programme Past Present Sustainability (PAES) 2020-09-14T09:37:01Z 17 application/pdf http://hdl.handle.net/10138/319322 eng eng COPERNICUS GESELLSCHAFT MBH 10.5194/cp-16-1451-2020 This research has been supported by the Research Council of Norway (grant no. 248776/E10), the Ministry of Earth Science, Earth System Science Organization (grant no. MoES/Indo-Nor/PS-2/2015), and the JSPS KAKENHI (grant nos. 23244102, 17H06318). Orme , L C , Crosta , X , Miettinen , A , Divine , D , Husum , K , Isaksson , E , Wacker , L , Mohan , R , Ther , O & Ikehara , M 2020 , ' Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene ' , Climate of the Past , vol. 16 , pp. 1451-1467 . https://doi.org/10.5194/cp-16-1451-2020 ORCID: /0000-0003-4537-2556/work/80576748 f307ac0c-a9ec-436e-9c02-c8e4c35e0e0d http://hdl.handle.net/10138/319322 000562026200001 cc_by openAccess info:eu-repo/semantics/openAccess MAJOR DIATOM TAXA ANTARCTIC CLIMATE VARIABILITY HEMISPHERE WESTERLY WINDS ATMOSPHERIC CO2 ATLANTIC SECTOR LAST DEGLACIATION ANNULAR MODE CONRAD RISE ICE SEDIMENTS 1172 Environmental sciences Article publishedVersion 2020 ftunivhelsihelda 2023-12-14T00:08:13Z Centennial- and millennial-scale variability of Southern Ocean temperature over the Holocene is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variations in the region coming mainly from ice core records. Here we present a high-resolution (similar to 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 (calibrated kiloyears before present). During the late deglaciation, the new SST record shows cool temperatures at 14.2-12.9 ka and gradual warming between 12.9 and 11.6 ka in phase with atmospheric temperature evolution. This supports the evolution of the Southern Ocean SST during the deglaciation being 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 to 8.7 ka followed by a slight cooling and greater variability from 8.7 to 1 ka, with a quasi-periodic variability of 200-260 years identified by spectral analysis. We suggest that the increased variability during the mid- to late Holocene reflects the establishment of centennial variability in SST connected with changes in the high-latitude atmospheric circulation and Southern Ocean convection. Peer reviewed Article in Journal/Newspaper Antarc* Antarctic ice core Southern Ocean HELDA – University of Helsinki Open Repository Antarctic Southern Ocean Indian Conrad Rise ENVELOPE(41.000,41.000,-53.000,-53.000) Climate of the Past 16 4 1451 1467 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
MAJOR DIATOM TAXA ANTARCTIC CLIMATE VARIABILITY HEMISPHERE WESTERLY WINDS ATMOSPHERIC CO2 ATLANTIC SECTOR LAST DEGLACIATION ANNULAR MODE CONRAD RISE ICE SEDIMENTS 1172 Environmental sciences |
spellingShingle |
MAJOR DIATOM TAXA ANTARCTIC CLIMATE VARIABILITY HEMISPHERE WESTERLY WINDS ATMOSPHERIC CO2 ATLANTIC SECTOR LAST DEGLACIATION ANNULAR MODE CONRAD RISE ICE SEDIMENTS 1172 Environmental sciences Orme, Lisa Claire Crosta, Xavier Miettinen, Arto Divine, Dmitry 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 |
topic_facet |
MAJOR DIATOM TAXA ANTARCTIC CLIMATE VARIABILITY HEMISPHERE WESTERLY WINDS ATMOSPHERIC CO2 ATLANTIC SECTOR LAST DEGLACIATION ANNULAR MODE CONRAD RISE ICE SEDIMENTS 1172 Environmental sciences |
description |
Centennial- and millennial-scale variability of Southern Ocean temperature over the Holocene is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variations in the region coming mainly from ice core records. Here we present a high-resolution (similar to 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 (calibrated kiloyears before present). During the late deglaciation, the new SST record shows cool temperatures at 14.2-12.9 ka and gradual warming between 12.9 and 11.6 ka in phase with atmospheric temperature evolution. This supports the evolution of the Southern Ocean SST during the deglaciation being 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 to 8.7 ka followed by a slight cooling and greater variability from 8.7 to 1 ka, with a quasi-periodic variability of 200-260 years identified by spectral analysis. We suggest that the increased variability during the mid- to late Holocene reflects the establishment of centennial variability in SST connected with changes in the high-latitude atmospheric circulation and Southern Ocean convection. Peer reviewed |
author2 |
Ecosystems and Environment Research Programme Past Present Sustainability (PAES) |
format |
Article in Journal/Newspaper |
author |
Orme, Lisa Claire Crosta, Xavier Miettinen, Arto Divine, Dmitry Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru |
author_facet |
Orme, Lisa Claire Crosta, Xavier Miettinen, Arto Divine, Dmitry Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru |
author_sort |
Orme, Lisa Claire |
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 GESELLSCHAFT MBH |
publishDate |
2020 |
url |
http://hdl.handle.net/10138/319322 |
long_lat |
ENVELOPE(41.000,41.000,-53.000,-53.000) |
geographic |
Antarctic Southern Ocean Indian Conrad Rise |
geographic_facet |
Antarctic Southern Ocean Indian Conrad Rise |
genre |
Antarc* Antarctic ice core Southern Ocean |
genre_facet |
Antarc* Antarctic ice core Southern Ocean |
op_relation |
10.5194/cp-16-1451-2020 This research has been supported by the Research Council of Norway (grant no. 248776/E10), the Ministry of Earth Science, Earth System Science Organization (grant no. MoES/Indo-Nor/PS-2/2015), and the JSPS KAKENHI (grant nos. 23244102, 17H06318). Orme , L C , Crosta , X , Miettinen , A , Divine , D , Husum , K , Isaksson , E , Wacker , L , Mohan , R , Ther , O & Ikehara , M 2020 , ' Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene ' , Climate of the Past , vol. 16 , pp. 1451-1467 . https://doi.org/10.5194/cp-16-1451-2020 ORCID: /0000-0003-4537-2556/work/80576748 f307ac0c-a9ec-436e-9c02-c8e4c35e0e0d http://hdl.handle.net/10138/319322 000562026200001 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
4 |
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1451 |
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1467 |
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