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| Titel |
Intrinsic variability of the Antarctic Circumpolar Current system: low- and high-frequency fluctuations of the Argentine Basin flow |
| VerfasserIn |
G. Sgubin, S. Pierini, H. A. Dijkstra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 2 ; Nr. 10, no. 2 (2014-04-10), S.201-213 |
| Datensatznummer |
250116965
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| Publikation (Nr.) |
 copernicus.org/os-10-201-2014.pdf |
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| Zusammenfassung |
| 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. |
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