Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow
In this paper, the variability of the Antarctic Circumpolar Current system produced by purely intrinsic nonlinear oceanic mechanisms is studied through a sigma-coordinate ocean model, implemented in a large portion of the Southern Ocean at an eddy-permitting resolution under steady surface heat and...
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ftcopernicus:oai:publications.copernicus.org:os22183 2023-05-15T13:54:27+02:00 Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow Sgubin, G. Pierini, S. Dijkstra, H. A. 2018-01-15 application/pdf https://doi.org/10.5194/os-10-201-2014 https://os.copernicus.org/articles/10/201/2014/ eng eng doi:10.5194/os-10-201-2014 https://os.copernicus.org/articles/10/201/2014/ eISSN: 1812-0792 Text 2018 ftcopernicus https://doi.org/10.5194/os-10-201-2014 2020-07-20T16:25:08Z In this paper, the variability of the Antarctic Circumpolar Current system produced by purely intrinsic nonlinear oceanic mechanisms is studied through a sigma-coordinate ocean model, implemented in a large portion of the Southern Ocean at an eddy-permitting resolution under steady surface heat and momentum fluxes. The mean transport through the Drake Passage and the structure of the main Antarctic Circumpolar Current fronts are well reproduced by the model. Intrinsic variability is found to be particularly intense in the Subantarctic Front and in the Argentine Basin, on which further analysis is focused. The low-frequency variability at interannual timescales is related to bimodal behavior of the Zapiola Anticyclone, with transitions between a strong and collapsed anticyclonic circulation in substantial agreement with altimeter observations. Variability on smaller timescales shows clear evidence of topographic Rossby-wave propagation along the eastern and southern flanks of the Zapiola Rise and of mesoscale eddies, also in agreement with altimeter observations. The analysis of the relationship between the low- and high-frequency variability suggests possible mechanisms of mutual interaction. Text Antarc* Antarctic Drake Passage Southern Ocean Copernicus Publications: E-Journals Antarctic Argentine Drake Passage Southern Ocean The Antarctic Zapiola ENVELOPE(-63.567,-63.567,-65.083,-65.083) Ocean Science 10 2 201 213 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
In this paper, the variability of the Antarctic Circumpolar Current system produced by purely intrinsic nonlinear oceanic mechanisms is studied through a sigma-coordinate ocean model, implemented in a large portion of the Southern Ocean at an eddy-permitting resolution under steady surface heat and momentum fluxes. The mean transport through the Drake Passage and the structure of the main Antarctic Circumpolar Current fronts are well reproduced by the model. Intrinsic variability is found to be particularly intense in the Subantarctic Front and in the Argentine Basin, on which further analysis is focused. The low-frequency variability at interannual timescales is related to bimodal behavior of the Zapiola Anticyclone, with transitions between a strong and collapsed anticyclonic circulation in substantial agreement with altimeter observations. Variability on smaller timescales shows clear evidence of topographic Rossby-wave propagation along the eastern and southern flanks of the Zapiola Rise and of mesoscale eddies, also in agreement with altimeter observations. The analysis of the relationship between the low- and high-frequency variability suggests possible mechanisms of mutual interaction. |
format |
Text |
author |
Sgubin, G. Pierini, S. Dijkstra, H. A. |
spellingShingle |
Sgubin, G. Pierini, S. Dijkstra, H. A. Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
author_facet |
Sgubin, G. Pierini, S. Dijkstra, H. A. |
author_sort |
Sgubin, G. |
title |
Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
title_short |
Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
title_full |
Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
title_fullStr |
Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
title_full_unstemmed |
Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
title_sort |
intrinsic variability of the antarctic circumpolar current system: low- and high-frequency fluctuations of the argentine basin flow |
publishDate |
2018 |
url |
https://doi.org/10.5194/os-10-201-2014 https://os.copernicus.org/articles/10/201/2014/ |
long_lat |
ENVELOPE(-63.567,-63.567,-65.083,-65.083) |
geographic |
Antarctic Argentine Drake Passage Southern Ocean The Antarctic Zapiola |
geographic_facet |
Antarctic Argentine Drake Passage Southern Ocean The Antarctic Zapiola |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/os-10-201-2014 https://os.copernicus.org/articles/10/201/2014/ |
op_doi |
https://doi.org/10.5194/os-10-201-2014 |
container_title |
Ocean Science |
container_volume |
10 |
container_issue |
2 |
container_start_page |
201 |
op_container_end_page |
213 |
_version_ |
1766260367512567808 |