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| Titel |
Isolation on the West Florida Shelf with implications for red tides and pollutant dispersal in the Gulf of Mexico |
| VerfasserIn |
M. J. Olascoaga |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 17, no. 6 ; Nr. 17, no. 6 (2010-12-03), S.685-696 |
| Datensatznummer |
250013758
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| Publikation (Nr.) |
 copernicus.org/npg-17-685-2010.pdf |
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| Zusammenfassung |
| Analysis of year-long drifter trajectories and records of simulated surface
Lagrangian Coherent Structures (LCSs) have suggested the presence of a
resilient Cross-Shelf Transport Barrier (CSTB) on the West Florida Shelf
(WFS). The CSTB was conjectured to provide a large degree of isolation, which
is consequential for the fueling of red tides on the southern WFS by
nutrients possibly released by rivers and canals directly on the region. Here
this conjecture is thoroughly tested by identifying LCSs as well as
performing tracer advection calculations based on seven-year-long records of
surface and subsurface currents produced by a HYbrid-Coordinate Ocean Model
(HYCOM) simulation of the Gulf of Mexico (GoM). The identified LCSs suggest
that the CSTB extends downward in the water column. The tracer calculations
suggest that, while the majority of the nutrients possibly released by rivers
and canals directly on the southern WFS are retained within the region for
long times, only a small fraction of the nutrients possibly released by
rivers outside the WFS reach the southern WFS, mainly accompanying shoreward
excursions of the CSTB. These results add importance to the role played by
the CSTB in controlling red tide development on the WFS. Implications of the
results for the dispersal of pollutants, such as oil, in the GoM are
discussed. |
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