Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr
In spite of the important role played by the Southern Ocean in global climate, the few existing paleoceanographic records in the east Pacific sector do not extend beyond one glacial-interglacial cycle, hindering circumpolar comparison of past sea surface temperature (SST) evolution in the Southern O...
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ftarchimer:oai:archimer.ifremer.fr:37610 2023-05-15T13:50:50+02:00 Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr Ho, Sze Ling Mollenhauer, Gesine Lamy, Frank Martinez-garcia, Alfredo Mohtadi, Mahyar Gersonde, Rainer Hebbeln, Dierk Nunez-ricardo, Samuel Rosell-mele, Antoni Tiedemann, Ralf 2012-10 application/pdf https://archimer.ifremer.fr/doc/00265/37610/36990.pdf https://archimer.ifremer.fr/doc/00265/37610/36991.pdf https://doi.org/10.1029/2012PA002317 https://archimer.ifremer.fr/doc/00265/37610/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00265/37610/36990.pdf https://archimer.ifremer.fr/doc/00265/37610/36991.pdf doi:10.1029/2012PA002317 https://archimer.ifremer.fr/doc/00265/37610/ 2012. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2012-10 , Vol. 27 , N. PA4202 , P. 1-15 text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.1029/2012PA002317 2021-09-23T20:26:12Z In spite of the important role played by the Southern Ocean in global climate, the few existing paleoceanographic records in the east Pacific sector do not extend beyond one glacial-interglacial cycle, hindering circumpolar comparison of past sea surface temperature (SST) evolution in the Southern Ocean. Here we present three alkenone-based Pleistocene SST records from the subantarctic and subtropical Pacific. We use a regional core top calibration data set to constrain the choice of calibrations for paleo SST estimation. Our core top data confirm that the alkenone-based U-37(K) and U-37(K') values correlate linearly with the SST, in a similar fashion as the most commonly used laboratory culture-based calibrations even at low temperatures (down to similar to 1 degrees C), rendering these calibrations appropriate for application in the subantarctic Pacific. However, these alkenone indices yield diverging temporal trends in the Pleistocene SST records. On the basis of the better agreement with delta O-18 records and other SST records in the subantarctic Southern Ocean, we propose that the U-37(K) is a better index for SST reconstruction in this region than the more commonly used U-37(K') index. The U-K(37)-derived SST records suggest glacial cooling of similar to 8 degrees C and similar to 4 degrees C in the subantarctic and subtropical Pacific, respectively. Such extent of subantarctic glacial cooling is comparable to that in other sectors of the Southern Ocean, indicating a uniform circumpolar cooling during the Pleistocene. Furthermore, our SST records also imply massive equatorward migrations of the Antarctic Circumpolar Current (ACC) frontal systems and an enhanced transport of ACC water to lower latitudes during glacials by the Peru-Chile Current. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Pacific Southern Ocean The Antarctic Paleoceanography 27 4 |
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 |
In spite of the important role played by the Southern Ocean in global climate, the few existing paleoceanographic records in the east Pacific sector do not extend beyond one glacial-interglacial cycle, hindering circumpolar comparison of past sea surface temperature (SST) evolution in the Southern Ocean. Here we present three alkenone-based Pleistocene SST records from the subantarctic and subtropical Pacific. We use a regional core top calibration data set to constrain the choice of calibrations for paleo SST estimation. Our core top data confirm that the alkenone-based U-37(K) and U-37(K') values correlate linearly with the SST, in a similar fashion as the most commonly used laboratory culture-based calibrations even at low temperatures (down to similar to 1 degrees C), rendering these calibrations appropriate for application in the subantarctic Pacific. However, these alkenone indices yield diverging temporal trends in the Pleistocene SST records. On the basis of the better agreement with delta O-18 records and other SST records in the subantarctic Southern Ocean, we propose that the U-37(K) is a better index for SST reconstruction in this region than the more commonly used U-37(K') index. The U-K(37)-derived SST records suggest glacial cooling of similar to 8 degrees C and similar to 4 degrees C in the subantarctic and subtropical Pacific, respectively. Such extent of subantarctic glacial cooling is comparable to that in other sectors of the Southern Ocean, indicating a uniform circumpolar cooling during the Pleistocene. Furthermore, our SST records also imply massive equatorward migrations of the Antarctic Circumpolar Current (ACC) frontal systems and an enhanced transport of ACC water to lower latitudes during glacials by the Peru-Chile Current. |
format |
Article in Journal/Newspaper |
author |
Ho, Sze Ling Mollenhauer, Gesine Lamy, Frank Martinez-garcia, Alfredo Mohtadi, Mahyar Gersonde, Rainer Hebbeln, Dierk Nunez-ricardo, Samuel Rosell-mele, Antoni Tiedemann, Ralf |
spellingShingle |
Ho, Sze Ling Mollenhauer, Gesine Lamy, Frank Martinez-garcia, Alfredo Mohtadi, Mahyar Gersonde, Rainer Hebbeln, Dierk Nunez-ricardo, Samuel Rosell-mele, Antoni Tiedemann, Ralf Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr |
author_facet |
Ho, Sze Ling Mollenhauer, Gesine Lamy, Frank Martinez-garcia, Alfredo Mohtadi, Mahyar Gersonde, Rainer Hebbeln, Dierk Nunez-ricardo, Samuel Rosell-mele, Antoni Tiedemann, Ralf |
author_sort |
Ho, Sze Ling |
title |
Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr |
title_short |
Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr |
title_full |
Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr |
title_fullStr |
Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr |
title_full_unstemmed |
Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr |
title_sort |
sea surface temperature variability in the pacific sector of the southern ocean over the past 700 kyr |
publisher |
Amer Geophysical Union |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00265/37610/36990.pdf https://archimer.ifremer.fr/doc/00265/37610/36991.pdf https://doi.org/10.1029/2012PA002317 https://archimer.ifremer.fr/doc/00265/37610/ |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2012-10 , Vol. 27 , N. PA4202 , P. 1-15 |
op_relation |
https://archimer.ifremer.fr/doc/00265/37610/36990.pdf https://archimer.ifremer.fr/doc/00265/37610/36991.pdf doi:10.1029/2012PA002317 https://archimer.ifremer.fr/doc/00265/37610/ |
op_rights |
2012. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2012PA002317 |
container_title |
Paleoceanography |
container_volume |
27 |
container_issue |
4 |
_version_ |
1766254139741831168 |