Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene
The Amundsen Sea Low (ASL) plays a major role in the climate and environment of Antarctica and the Southern Ocean, including surface air temperature and sea ice concentration changes. Unfortunately, a relative dearth of observational data across the Amundsen and Bellingshausen seas prior to the sate...
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004121 2023-05-15T13:23:56+02:00 Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene Thomas, Zoë A. Jones, Richard T. Fogwill, Chris J. Hatton, Jackie Williams, Alan N. Hogg, Alan Mooney, Scott Jones, Philip Lister, David Mayewski, Paul Turney, Chris S. M. 2018-11 electronic https://doi.org/10.5194/cp-14-1727-2018 https://noa.gwlb.de/receive/cop_mods_00004121 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004078/cp-14-1727-2018.pdf https://cp.copernicus.org/articles/14/1727/2018/cp-14-1727-2018.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-14-1727-2018 https://noa.gwlb.de/receive/cop_mods_00004121 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004078/cp-14-1727-2018.pdf https://cp.copernicus.org/articles/14/1727/2018/cp-14-1727-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/cp-14-1727-2018 2022-02-08T23:00:16Z The Amundsen Sea Low (ASL) plays a major role in the climate and environment of Antarctica and the Southern Ocean, including surface air temperature and sea ice concentration changes. Unfortunately, a relative dearth of observational data across the Amundsen and Bellingshausen seas prior to the satellite era (post-1979) limits our understanding of the past behaviour and impact of the ASL. The limited proxy evidence for changes in the ASL are primarily restricted to the Antarctic where ice core evidence suggests a deepening of the atmospheric pressure system during the late Holocene. However, no data have previously been reported from the northern side of the ASL. Here we report a high-resolution, multi-proxy study of a 5000-year-long peat record from the Falkland Islands, a location sensitive to contemporary ASL dynamics which modulates northerly and westerly airflow across the southwestern South Atlantic sector of the Southern Ocean. In combination with climate reanalysis, we find a marked period of wetter, colder conditions most likely the result of enhanced southerly airflow between 5000 and 2500 years ago, suggesting limited ASL influence over the region. After 2500 years ago, drier and warmer conditions were established, implying more westerly airflow and the increased projection of the ASL onto the South Atlantic. The possible role of the equatorial Pacific via atmospheric teleconnections in driving this change is discussed. Our results are in agreement with Antarctic ice core records and fjord sediments from the southern South American coast, and suggest that the Falkland Islands provide a valuable location for reconstructing high southern latitude atmospheric circulation changes on multi-decadal to millennial timescales. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica ice core Sea ice Southern Ocean Niedersächsisches Online-Archiv NOA Amundsen Sea Antarctic Pacific Southern Ocean The Antarctic Climate of the Past 14 11 1727 1738 |
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article Verlagsveröffentlichung Thomas, Zoë A. Jones, Richard T. Fogwill, Chris J. Hatton, Jackie Williams, Alan N. Hogg, Alan Mooney, Scott Jones, Philip Lister, David Mayewski, Paul Turney, Chris S. M. Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene |
topic_facet |
article Verlagsveröffentlichung |
description |
The Amundsen Sea Low (ASL) plays a major role in the climate and environment of Antarctica and the Southern Ocean, including surface air temperature and sea ice concentration changes. Unfortunately, a relative dearth of observational data across the Amundsen and Bellingshausen seas prior to the satellite era (post-1979) limits our understanding of the past behaviour and impact of the ASL. The limited proxy evidence for changes in the ASL are primarily restricted to the Antarctic where ice core evidence suggests a deepening of the atmospheric pressure system during the late Holocene. However, no data have previously been reported from the northern side of the ASL. Here we report a high-resolution, multi-proxy study of a 5000-year-long peat record from the Falkland Islands, a location sensitive to contemporary ASL dynamics which modulates northerly and westerly airflow across the southwestern South Atlantic sector of the Southern Ocean. In combination with climate reanalysis, we find a marked period of wetter, colder conditions most likely the result of enhanced southerly airflow between 5000 and 2500 years ago, suggesting limited ASL influence over the region. After 2500 years ago, drier and warmer conditions were established, implying more westerly airflow and the increased projection of the ASL onto the South Atlantic. The possible role of the equatorial Pacific via atmospheric teleconnections in driving this change is discussed. Our results are in agreement with Antarctic ice core records and fjord sediments from the southern South American coast, and suggest that the Falkland Islands provide a valuable location for reconstructing high southern latitude atmospheric circulation changes on multi-decadal to millennial timescales. |
format |
Article in Journal/Newspaper |
author |
Thomas, Zoë A. Jones, Richard T. Fogwill, Chris J. Hatton, Jackie Williams, Alan N. Hogg, Alan Mooney, Scott Jones, Philip Lister, David Mayewski, Paul Turney, Chris S. M. |
author_facet |
Thomas, Zoë A. Jones, Richard T. Fogwill, Chris J. Hatton, Jackie Williams, Alan N. Hogg, Alan Mooney, Scott Jones, Philip Lister, David Mayewski, Paul Turney, Chris S. M. |
author_sort |
Thomas, Zoë A. |
title |
Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene |
title_short |
Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene |
title_full |
Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene |
title_fullStr |
Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene |
title_full_unstemmed |
Evidence for increased expression of the Amundsen Sea Low over the South Atlantic during the late Holocene |
title_sort |
evidence for increased expression of the amundsen sea low over the south atlantic during the late holocene |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-1727-2018 https://noa.gwlb.de/receive/cop_mods_00004121 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004078/cp-14-1727-2018.pdf https://cp.copernicus.org/articles/14/1727/2018/cp-14-1727-2018.pdf |
geographic |
Amundsen Sea Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Pacific Southern Ocean The Antarctic |
genre |
Amundsen Sea Antarc* Antarctic Antarctica ice core Sea ice Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica ice core Sea ice Southern Ocean |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-14-1727-2018 https://noa.gwlb.de/receive/cop_mods_00004121 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004078/cp-14-1727-2018.pdf https://cp.copernicus.org/articles/14/1727/2018/cp-14-1727-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-14-1727-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
11 |
container_start_page |
1727 |
op_container_end_page |
1738 |
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1766376480726581248 |