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| Titel |
Intrusion of coastal waters into the pelagic eastern Mediterranean: in situ and satellite-based characterization |
| VerfasserIn |
S. Efrati, Y. Lehahn, E. Rahav, N. Kress, B. Herut, I. Gertman, R. Goldman, T. Ozer, M. Lazar, E. Heifetz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 5 ; Nr. 10, no. 5 (2013-05-21), S.3349-3357 |
| Datensatznummer |
250018255
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| Publikation (Nr.) |
 copernicus.org/bg-10-3349-2013.pdf |
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| Zusammenfassung |
| A combined dataset of near-real-time multi-satellite observations and
in situ measurements from a high-resolution survey is used for
characterizing physical-biogeochemical properties of a patch stretching from
the coast to the open sea in the Levantine Basin (LB) of the eastern
Mediterranean (EM). Spatial analysis of the combined dataset indicates that the
patch is a semi-enclosed system, bounded within the mixed layer and separated
from ambient waters by transport barriers induced by horizontal stirring. As
such, the patch is characterized by physical-biogeochemical properties that
significantly differ from those of the waters surrounding it, with lower
salinity and higher temperatures, concentrations of silicic acid and
chlorophyll a, and abundance of Synechococcus and
picoeukaryote cells. Based on estimates of patch dimensions
(∼40 km width and ∼25 m depth) and propagation speed
(∼0.09 m s−1), the volume flux associated with the patch is
found to be on the order of 0.1 Sv. Our observations suggest that horizontal
stirring by surface currents is likely to have an important impact on the
ultra-oligotrophic Levantine Basin ecosystem, through (1) transport of
nutrients and coastally derived material, and (2) formation of local,
dynamically isolated niches. In addition, this work provides a
satellite-based framework for planning and executing high-resolution sampling
strategies in the interface between the coast and the open sea. |
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