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| Titel |
On the vertical distribution of the chlorophyll a concentration in the Mediterranean Sea: a basin-scale and seasonal approach |
| VerfasserIn |
H. Lavigne, F. D'Ortenzio, M. Ribera d'Alcalá, H. Claustre, R. Sauzède, M. Gačić |
| 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 ; 12, no. 16 ; Nr. 12, no. 16 (2015-08-26), S.5021-5039 |
| Datensatznummer |
250118073
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| Publikation (Nr.) |
 copernicus.org/bg-12-5021-2015.pdf |
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| Zusammenfassung |
| The distribution of the chlorophyll a concentration ([Chl a]) in the
Mediterranean Sea, mainly obtained from satellite surface observations or
from scattered in situ experiments, is updated by analyzing a database of
fluorescence profiles converted into [Chl a]. The database, which includes
6790 fluorescence profiles from various origins, was processed with a
specific quality control procedure. To ensure homogeneity between the
different data sources, 65 % of fluorescence profiles have been
intercalibrated on the basis of their concomitant satellite [Chl a]
estimation. The climatological pattern of [Chl a] vertical profiles in four
key sites of the Mediterranean Sea has been analyzed. Climatological results
confirm previous findings over the range of existing [Chl a] values and
throughout the principal Mediterranean trophic regimes. They also provide new
insights into the seasonal variability in the shape of the vertical [Chl a]
profile, inaccessible through remote-sensing observations. An analysis based on
the recognition of the general shape of the fluorescence profile was also
performed. Although the shape of [Chl a] vertical distribution
characterized by a deep chlorophyll maximum (DCM) is ubiquitous during
summer, different forms are observed during winter, thus suggesting that
factors affecting the vertical distribution of the biomass are complex and
highly variable. The [Chl a] spatial distribution in the Mediterranean Sea
mimics, on smaller scales, what is observed in the global ocean. As already
evidenced by analyzing satellite surface observations, midlatitude- and
subtropical-like phytoplankton dynamics coexist in the Mediterranean Sea.
Moreover, the Mediterranean DCM variability appears to be characterized by
patterns already observed on the global scale. |
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