Satellite and in situ monitoring of Chl-a, Turbidity, and Total Suspended Matter in coastal waters: experience of the year 2017 along the French Coasts - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Marine Science and Engineering Année : 2020

Satellite and in situ monitoring of Chl-a, Turbidity, and Total Suspended Matter in coastal waters: experience of the year 2017 along the French Coasts

Sylvaine Françoise
  • Fonction : Auteur
Anne Goffart
Tania Hernández Fariñas
  • Fonction : Auteur
Maud Lemoine
Aude Piraud
  • Fonction : Auteur
Michael Rétho
  • Fonction : Auteur

Résumé

The consistency of satellite and in situ time series of Chlorophyll-a (Chl-a), Turbidity and Total Suspended Matters (TSM) was investigated at 17 coastal stations throughout the year 2017. These stations covered different water types, from relatively clear waters in the Mediterranean Sea to moderately turbid regions in the Bay of Biscay and the southern bight of the North-Sea. 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.
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hal-02928110 , version 1 (19-09-2020)

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Francis Gohin, Philippe Bryère, Alain Lefebvre, Pierre-Guy Sauriau, Nicolas Savoye, et al.. Satellite and in situ monitoring of Chl-a, Turbidity, and Total Suspended Matter in coastal waters: experience of the year 2017 along the French Coasts. Journal of Marine Science and Engineering, 2020, Marine Observation and Monitoring towards an Ecosystem Approach), 8 (9), pp.665. ⟨10.3390/jmse8090665⟩. ⟨hal-02928110⟩
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