{"refrec":{"BRefID":322875,"RR":"<b>Gohin, F.; Van der Zande, D.; Tilstone, G.; Eleveld, M.A.; Lefebvre, A.; Andrieux-Loyer, F.; Blauw, A.N.; Bryère, P.; Devreker, D.; Gamesson, P.; Hernandez-Farinas, T.; Lamaury, Y.; Lampert, L.; Lavigne, H.; Menet-Nedelec, F.; Pardo, S.; Saulquin, B.</b> (2019). Twenty years of satellite and <i>in situ</i> observations of surface chlorophyll-<i>a</i> from the northern Bay of Biscay to the eastern English Channel. Is the water quality improving? <i>Remote Sens. Environ. 233</i>: 111343. <a href=\"https://dx.doi.org/10.1016/j.rse.2019.111343\" target=\"_blank\">https://dx.doi.org/10.1016/j.rse.2019.111343</a>","BEntID":316346,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":" <i>Remote Sens. Environ. 233</i>: 111343. <a href=\"https://dx.doi.org/10.1016/j.rse.2019.111343\" target=\"_blank\">https://dx.doi.org/10.1016/j.rse.2019.111343</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gohin, F.; Van der Zande, D.; Tilstone, G.; Eleveld, M.A.; Lefebvre, A.; Andrieux-Loyer, F.; Blauw, A.N.; Bryère, P.; Devreker, D.; Gamesson, P.; Hernandez-Farinas, T.; Lamaury, Y.; Lampert, L.; Lavigne, H.; Menet-Nedelec, F.; Pardo, S.; Saulquin, B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gohin, F. <i>et al.</i>","Englishabstract":"The variability of the phytoplankton biomass derived from daily chlorophyll-<em>a</em> (Chl-<em>a</em>) satellite images was investigated over the period 1998–2017 in the surface waters of the English Channel and the northern Bay of Biscay. Merged satellite (SeaWiFS-MODIS/Aqua-MERIS-VIIRS) Chl-<em>a</em> was calculated using the OC5 Ifremer algorithm which is optimized for moderately-turbid waters. The seasonal cycle in satellite-derived Chl-<em>a</em> was compared with <em>in situ</em> measurements made at seven coastal stations located in the southern side of the English Channel and in the northern Bay of Biscay. The results firstly showed that the satellite Chl-<em>a</em> product, derived from a suite of space-borne marine reflectance data, is in agreement with the coastal observations. For compliance with the directives of the European Union on water quality, time-series of 6-year moving average of Chl-<em>a</em> were assessed over the region. A clear decline was observed in the mean and 90th percentile of Chl-<em>a</em> at stations located in the mixed waters of the English Channel. The time-series at the stations located in the Bay of Biscay showed yearly fluctuations which correlated well with river discharge, but no overall Chl-<em>a</em> trend was observed. In the English Channel, the shape of the seasonal cycle in Chl-<em>a</em> changed over time. Narrower peaks were observed in spring at the end of the studied period, indicating an earlier limitation by nutrients. Monthly averages of satellite Chl-<em>a</em>, over the periods 1998–2003 and 2012–2017, exhibited spatial and temporal patterns in the evolution of the phytoplankton biomass similar to these observed at the seven coastal stations. Both the <em>in situ</em> and satellite Chl-<em>a</em> times-series showed a decrease in Chl-<em>a</em> in the English Channel in May, June and July. This trend in phytoplankton biomass is correlated with lower river discharges at the end of the period and a constant reduction in the riverine input of phosphorus through improvements in the water quality of the surrounding river catchments.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Twenty years of satellite and <i>in situ</i> observations of surface chlorophyll-<i>a</i> from the northern Bay of Biscay to the eastern English Channel. 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