Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble
The changes in the Antarctic Circumpolar Current system associated with the Polar, sub-Antarctic and Subtropical Fronts in the Atlantic are examined in a ten-member ensemble using the Community Earth System Model. Results for the ensemble average mean show that the Polar Front at 25 degrees W shifts...
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Language: | English |
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2019
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Online Access: | https://doi.org/10.1017/S0954102018000433 |
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ftncar:oai:drupal-site.org:articles_22347 2023-07-30T03:57:57+02:00 Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble Wainer, Ilana (author) Gent, Peter R. (author) 2019-02-01 https://doi.org/10.1017/S0954102018000433 en eng Antarctic Science--Antarctic Science--0954-1020--1365-2079 articles:22347 ark:/85065/d7qn69tz doi:10.1017/S0954102018000433 Copyright 2019 Antarctic Science Ltd. article Text 2019 ftncar https://doi.org/10.1017/S0954102018000433 2023-07-17T18:25:45Z The changes in the Antarctic Circumpolar Current system associated with the Polar, sub-Antarctic and Subtropical Fronts in the Atlantic are examined in a ten-member ensemble using the Community Earth System Model. Results for the ensemble average mean show that the Polar Front at 25 degrees W shifts to the south by 0.8 degrees during 1970-2000 compared to its mean latitude over the period 1050-1950. This shift is significant because it is more than twice the standard deviation of the mean latitude time series during 1050-1950. The shift is caused by a slight southward displacement of the Antarctic Circumpolar Current, which in turn is caused by a southward shift in the latitude of the maximum zonal wind stress. The sub-Antarctic Front also shows a small southward shift after 1970, with a maximum latitudinal displacement of 0.2 degrees. However, this shift is not significant compared to the standard deviation of the time series during 1050-1950. The Subtropical Front does not change its latitude during 1970-2000 compared to 1050-2000 because there is very little change in the wind-stress curl in the subtropics. Differences in temperature and salinity throughout the water column at 25 degrees W reveal that during 1970-2000 there is freshening of Antarctic Intermediate Water, whereas the Circumpolar Deep Water becomes saltier. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Southern Ocean The Antarctic Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Antarctic Science 31 1 37 51 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The changes in the Antarctic Circumpolar Current system associated with the Polar, sub-Antarctic and Subtropical Fronts in the Atlantic are examined in a ten-member ensemble using the Community Earth System Model. Results for the ensemble average mean show that the Polar Front at 25 degrees W shifts to the south by 0.8 degrees during 1970-2000 compared to its mean latitude over the period 1050-1950. This shift is significant because it is more than twice the standard deviation of the mean latitude time series during 1050-1950. The shift is caused by a slight southward displacement of the Antarctic Circumpolar Current, which in turn is caused by a southward shift in the latitude of the maximum zonal wind stress. The sub-Antarctic Front also shows a small southward shift after 1970, with a maximum latitudinal displacement of 0.2 degrees. However, this shift is not significant compared to the standard deviation of the time series during 1050-1950. The Subtropical Front does not change its latitude during 1970-2000 compared to 1050-2000 because there is very little change in the wind-stress curl in the subtropics. Differences in temperature and salinity throughout the water column at 25 degrees W reveal that during 1970-2000 there is freshening of Antarctic Intermediate Water, whereas the Circumpolar Deep Water becomes saltier. |
author2 |
Wainer, Ilana (author) Gent, Peter R. (author) |
format |
Article in Journal/Newspaper |
title |
Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble |
spellingShingle |
Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble |
title_short |
Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble |
title_full |
Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble |
title_fullStr |
Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble |
title_full_unstemmed |
Changes in the Atlantic sector of the Southern Ocean estimated from the CESM Last Millennium Ensemble |
title_sort |
changes in the atlantic sector of the southern ocean estimated from the cesm last millennium ensemble |
publishDate |
2019 |
url |
https://doi.org/10.1017/S0954102018000433 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Antarctic Southern Ocean The Antarctic Curl |
geographic_facet |
Antarctic Southern Ocean The Antarctic Curl |
genre |
Antarc* Antarctic Antarctic Science Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Science Southern Ocean |
op_relation |
Antarctic Science--Antarctic Science--0954-1020--1365-2079 articles:22347 ark:/85065/d7qn69tz doi:10.1017/S0954102018000433 |
op_rights |
Copyright 2019 Antarctic Science Ltd. |
op_doi |
https://doi.org/10.1017/S0954102018000433 |
container_title |
Antarctic Science |
container_volume |
31 |
container_issue |
1 |
container_start_page |
37 |
op_container_end_page |
51 |
_version_ |
1772820418570223616 |