Meridional displacement of the Antarctic Circumpolar Current
Observed long-term warming trends in the Southern Ocean have been interpreted as a sign of increased poleward eddy heat transport or of a poleward displacement of the entire Antarctic Circumpolar Current (ACC) frontal system. The two-decade-long record from satellite altimetry is an important source...
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ftcdlib:oai:escholarship.org:ark:/13030/qt1064g703 2023-09-26T15:11:50+02:00 Meridional displacement of the Antarctic Circumpolar Current Gille, Sarah T 20130273 2014-07-13 application/pdf https://escholarship.org/uc/item/1064g703 unknown eScholarship, University of California qt1064g703 https://escholarship.org/uc/item/1064g703 public Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences, vol 372, iss 2019 Antarctic Circumpolar Current Southern Annular mode climate change wind forcing General Science & Technology article 2014 ftcdlib 2023-08-28T18:03:35Z Observed long-term warming trends in the Southern Ocean have been interpreted as a sign of increased poleward eddy heat transport or of a poleward displacement of the entire Antarctic Circumpolar Current (ACC) frontal system. The two-decade-long record from satellite altimetry is an important source of information for evaluating the mechanisms governing these trends. While several recent studies have used sea surface height contours to index ACC frontal displacements, here altimeter data are instead used to track the latitude of mean ACC transport. Altimetric height contours indicate a poleward trend, regardless of whether they are associated with ACC fronts. The zonally averaged transport latitude index shows no long-term trend, implying that ACC meridional shifts determined from sea surface height might be associated with large-scale changes in sea surface height more than with localized shifts in frontal positions. The transport latitude index is weakly sensitive to the Southern Annular Mode, but is uncorrelated with El Niño/Southern Oscillation. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of California: eScholarship Antarctic Southern Ocean The Antarctic |
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Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Antarctic Circumpolar Current Southern Annular mode climate change wind forcing General Science & Technology |
spellingShingle |
Antarctic Circumpolar Current Southern Annular mode climate change wind forcing General Science & Technology Gille, Sarah T Meridional displacement of the Antarctic Circumpolar Current |
topic_facet |
Antarctic Circumpolar Current Southern Annular mode climate change wind forcing General Science & Technology |
description |
Observed long-term warming trends in the Southern Ocean have been interpreted as a sign of increased poleward eddy heat transport or of a poleward displacement of the entire Antarctic Circumpolar Current (ACC) frontal system. The two-decade-long record from satellite altimetry is an important source of information for evaluating the mechanisms governing these trends. While several recent studies have used sea surface height contours to index ACC frontal displacements, here altimeter data are instead used to track the latitude of mean ACC transport. Altimetric height contours indicate a poleward trend, regardless of whether they are associated with ACC fronts. The zonally averaged transport latitude index shows no long-term trend, implying that ACC meridional shifts determined from sea surface height might be associated with large-scale changes in sea surface height more than with localized shifts in frontal positions. The transport latitude index is weakly sensitive to the Southern Annular Mode, but is uncorrelated with El Niño/Southern Oscillation. |
format |
Article in Journal/Newspaper |
author |
Gille, Sarah T |
author_facet |
Gille, Sarah T |
author_sort |
Gille, Sarah T |
title |
Meridional displacement of the Antarctic Circumpolar Current |
title_short |
Meridional displacement of the Antarctic Circumpolar Current |
title_full |
Meridional displacement of the Antarctic Circumpolar Current |
title_fullStr |
Meridional displacement of the Antarctic Circumpolar Current |
title_full_unstemmed |
Meridional displacement of the Antarctic Circumpolar Current |
title_sort |
meridional displacement of the antarctic circumpolar current |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/1064g703 |
op_coverage |
20130273 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences, vol 372, iss 2019 |
op_relation |
qt1064g703 https://escholarship.org/uc/item/1064g703 |
op_rights |
public |
_version_ |
1778132261864996864 |