Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene

Show simple item record Orme, Lisa Claire Crosta, Xavier Miettinen, Arto Divine, Dmitry Husum, Katrine Isaksson, Elisabeth Wacker, Lukas Mohan, Rahul Ther, Olivier Ikehara, Minoru 2020-09-14T09:37:01Z 2020-09-14T09:37:01Z 2020-08-07
dc.identifier.citation 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 .
dc.identifier.other PURE: 144437463
dc.identifier.other PURE UUID: f307ac0c-a9ec-436e-9c02-c8e4c35e0e0d
dc.identifier.other WOS: 000562026200001
dc.identifier.other ORCID: /0000-0003-4537-2556/work/80576748
dc.description.abstract 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. en
dc.format.extent 17
dc.language.iso eng
dc.relation.ispartof Climate of the Past
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject ATMOSPHERIC CO2
dc.subject ANNULAR MODE
dc.subject CONRAD RISE
dc.subject ICE
dc.subject SEDIMENTS
dc.subject 1172 Environmental sciences
dc.title Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene en
dc.type Article
dc.contributor.organization Ecosystems and Environment Research Programme
dc.contributor.organization Past Present Sustainability (PAES)
dc.description.reviewstatus Peer reviewed
dc.relation.issn 1814-9324
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

Files in this item

Total number of downloads: Loading...

Files Size Format View
cp_16_1451_2020.pdf 4.222Mb PDF View/Open

This item appears in the following Collection(s)

Show simple item record