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| Titel |
Remote sensing observations of the coherent and non-coherent ring structures in the vicinity of Lesser Antilles |
| VerfasserIn |
R. C. Cruz Gómez, S. N. Bulgakov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 25, no. 2 ; Nr. 25, no. 2 (2007-03-08), S.331-340 |
| Datensatznummer |
250015781
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| Publikation (Nr.) |
 copernicus.org/angeo-25-331-2007.pdf |
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| Zusammenfassung |
The North Brazil Current Rings (NBCR) penetration into the Caribbean Sea is
being investigated by employing a merged altimeter-derived sea height anomaly
(TOPEX/Poseidon, Jason-1 and ERS-1, 2), the ocean surface color data
(SeaWiFS) and Global Drifter Program information. Four strategies are being
applied to process the data: (1) calculations of the Okubo-Weiss parameter for
NBCR identification, (2) longitude-time plots (also known as Hovmöller
diagrams), (3) two-dimensional Radon transforms and (4) two-dimensional
Fourier transforms.
A twofold NBCR structure has been detected in the region under
investigation. The results have shown that NBC rings mainly propagate into
the Caribbean Sea along two principal pathways (near 12° N and
17° N) in the ring translation corridor. Thus, rings following the
southern pathway in the fall-winter period can enter through very shallow
southern straits as non-coherent structures. A different behavior is
observed near the northern pathway (~17° N), where NBC rings are
thought to have a coherent structure during their squeezing into the eastern
Caribbean, i.e. conserving the principal characteristics of the incident
rings. We attribute this difference in the rings' behavior to the vertical
scales of the rings and to the bottom topography features in the vicinity of
the Lesser Antilles. |
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