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| Titel |
Comparison between three implementations of automatic identification algorithms for the quantification and characterization of mesoscale eddies in the South Atlantic Ocean |
| VerfasserIn |
J. M. A. C. Souza, C. Boyer Montégut, P. Y. Traon |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2011-05-18), S.317-334 |
| Datensatznummer |
250004645
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| Publikation (Nr.) |
 copernicus.org/os-7-317-2011.pdf |
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| Zusammenfassung |
| Three methods for automatic detection of mesoscale coherent structures are
applied to Sea Level Anomaly (SLA) fields in the South Atlantic. The first
method is based on the wavelet packet decomposition of the SLA data, the
second on the estimation of the Okubo-Weiss parameter and the third on a
geometric criterion using the winding-angle approach. The results provide a
comprehensive picture of the mesoscale eddies over the South Atlantic Ocean,
emphasizing their main characteristics: amplitude, diameter, duration and
propagation velocity. Five areas of particular eddy dynamics were selected:
the Brazil Current, the Agulhas eddies propagation corridor, the Agulhas
Current retroflexion, the Brazil-Malvinas confluence zone and the northern
branch of the Antarctic Circumpolar Current (ACC). For these areas, mean
propagation velocities and amplitudes were calculated. Two regions with long
duration eddies were observed, corresponding to the propagation of Agulhas
and ACC eddies. Through the comparison between the identification methods,
their main advantages and shortcomings were detailed. The geometric
criterion presents the best performance, mainly in terms of number of
detections, duration of the eddies and propagation velocities. The results
are particularly good for the Agulhas Rings, which have the longest
lifetimes of all South Atlantic eddies. |
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