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| Titel |
Annual cycles of chlorophyll-a, non-algal suspended particulate matter, and turbidity observed from space and in-situ in coastal waters |
| VerfasserIn |
F. Gohin |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2011-10-31), S.705-732 |
| Datensatznummer |
250004809
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| Publikation (Nr.) |
 copernicus.org/os-7-705-2011.pdf |
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| Zusammenfassung |
| Sea surface temperature, chlorophyll, and turbidity are three variables of
the coastal environment commonly measured by monitoring networks. The
observation networks are often based on coastal stations, which do not
provide a sufficient coverage to validate the model outputs or to be used in
assimilation over the continental shelf. Conversely, the products derived
from satellite reflectance generally show a decreasing quality shoreward, and
an assessment of the limitation of these data is required. The annual cycle,
mean, and percentile 90 of the chlorophyll concentration derived from
MERIS/ESA and MODIS/NASA data processed with a dedicated algorithm have
been compared to in-situ observations at twenty-six selected stations from
the Mediterranean Sea to the North Sea. Keeping in mind the validation, the
forcing, or the assimilation in hydrological, sediment-transport, or
ecological models, the non-algal Suspended Particulate Matter (SPM) is also
a parameter which is expected from the satellite imagery. However, the
monitoring networks measure essentially the turbidity and a consistency
between chlorophyll, representative of the phytoplankton biomass, non-algal
SPM, and turbidity is required. In this study, we derive the satellite
turbidity from chlorophyll and non-algal SPM with a common formula applied
to in-situ or satellite observations. The distribution of the satellite-derived turbidity exhibits the same main statistical
characteristics as those measured in-situ, which satisfies the first condition to monitor the
long-term changes or the large-scale spatial variation over the continental
shelf and along the shore. For the first time, climatologies of turbidity,
so useful for mapping the environment of the benthic habitats, are proposed
from space on areas as different as the southern North Sea or the western
Mediterranean Sea, with validation at coastal stations. |
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