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| Titel |
Surface expression of Mediterranean Water dipoles and their contribution to the shelf/slope – open ocean exchange |
| VerfasserIn |
N. Serra, I. Ambar, D. Boutov |
| 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 ; 6, no. 1 ; Nr. 6, no. 1 (2010-02-09), S.191-209 |
| Datensatznummer |
250003353
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| Publikation (Nr.) |
 copernicus.org/os-6-191-2010.pdf |
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| Zusammenfassung |
| The generation of dipolar eddies within the Mediterranean Water (MW) layers, at the
Portuguese continental slope, was observed using subsurface RAFOS floats. The surface
expression of these mid-depth dipoles is here characterized with remote sensing data, namely
with sea surface temperature, chlorophyll concentration and sea surface height
measurements. Two cases are presented demonstrating the remote detection of these underwater
structures in the Gulf of Cadiz during 1998 and 2001. The presence of subsurface MW dipoles
in the Iberian coastal zone is shown to influence the development of coastal upwelling
filaments. The surface circulation induced by the dipoles causes the upwelling filaments to
extend offshorewards and thus to enhance the transport of physical, chemical and biological
properties into the open ocean. A numerical model simulation of the ocean circulation around
the Iberian Peninsula forced by heat and freshwater fluxes (computed using the NCEP
reanalysis atmospheric state) and by the overflow of MW at the Strait of Gibraltar,
corroborates the connection between the surface and the mid-depth flows. The high-resolution
numerical experiment is used to help clarifying the occurrence of the MW dipoles surface
expression and the impact of these dipoles on the eddy kinetic energy of the upper ocean and
on the exchange of volume and salt between the shelf/slope and the open ocean. |
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