Satellite; Coastal monitoring; Phytoplankton; Chlorophyll-a; Total suspended matter; Turbidity
Abstract :
[en] Satellite retrievals were derived from MODIS/AQUA, VIIRS/NPP and OLCI-A/Sentinel-3 spectral
reflectance. In situ data were obtained from the coastal phytoplankton networks SOMLIT (CNRS),
REPHY (Ifremer) and associated networks. Satellite and in situ retrievals of the year 2017 were
compared to the historical seasonal cycles and percentiles, 10 and 90, observed in situ. Regarding the
sampling frequency in the Mediterranean Sea, a weekly in situ sampling allowed all major peaks in
Chl-a caught from space to be recorded at sea, and, conversely, all in situ peaks were observed from
space in a frequently cloud-free atmosphere. In waters of the Eastern English Channel, lower levels
of Chl-a were observed, both in situ and from space, compared to the historical averages. However,
despite a good overall agreement for low to moderate biomass, the satellite method, based on blue
and green wavelengths, tends to provide elevated and variable Chl-a in a high biomass environment.
Satellite-derived TSM and Turbidity were quite consistent with in situ measurements. Moreover,
satellite retrievals of the water clarity parameters often showed a lower range of variability than their
in situ counterparts did, being less scattered above and under the seasonal curves of percentiles 10
and 90.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Gohin, Francis
Bryère, Philippe
Lefebvre, Alain
Sauriau, Pierre-Guy
Savoye, Nicolas
Vantrepotte, Vincent
Bozec, Yann
Cariou, Thierry
Conan, Pascal
Coudray, Sylvain
Courtay, Gaelle
Françoise, Sylvaine
Goffart, Anne ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
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