Twenty years of satellite and in situ observations of surface chlorophyll-a from the northern Bay of Biscay to the eastern English Channel. Is the water quality improving?

Gohin, Francis; Zande, Dimitry Van der; Tilstone, Gavin H.; Eleveld, M.A.; Lefebvre, Alain; Andrieux-Loyer, Françoise; Blauw, Anouk; Bryère, Philippe; Devreker, David; Garnesson, Philippe; Fariñas, Tania Hernández; Lamaury, Yoann; Lampert, Luis; Lavigne, Héloïse; Menet-Nedelec, Florence; Pardo, Silvia; Saulquin, Bertrand

doi:10.1016/j.rse.2019.111343

Cited by 64 publications

(46 citation statements)

References 47 publications

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“…In conclusion, these results confirm the observation of Gohin et al (2019), showing a decrease of chlorophyll-a concentration in the English Channel and the North Sea. Moreover, we observe a similar negative trend in the Irish Sea.…”

Section: 8supporting

confidence: 91%

“…Using satellite data in the frame of the JMP EUNOSAT project (Joint Monitoring Program of the Eutrophication of NOrth Sea with SATellite data, founded by European commission, https://www. informatiehuismarien.nl/uk/projects/algae-evaluatedfrom/, see also chapter 3.4), Gohin et al (2019) show an evolution of chlorophyll-a since 1997 with a negative trend in the English Channel. The estimation chlorophyll-a concentration by remote sensing has been successfully used for more than 20 years (SeaWiFs/NASA, Modis/NASA, Meris/ESA, Viirs/NASA) for global (Maritorena and Siegel 2005;Morel et al 2007) and coastal applications Gohin 2011;Lapucci et al 2012;Novoa et al 2012;Loisel et al 2017).…”

Section: 8mentioning

confidence: 99%

“…the evolution of chlorophyll-a since 1997 with a negative trend in the English Channel while the Bay of Biscay was not impacted by this decrease. Moreover, these results are obtained using two different sources of chlorophyll-a data: products 3.8.1 and 3.8.2 were used for this study while Gohin et al (2019) used the level 4 IFREMER products (Saulquin et al 2011). Now that the decrease of chlorophyll-a is confirmed in the North of the IBIROOS region (Ireland-Biscay-Iberia Regional Operational Oceanographic System), we can study the impact on the mussel growth and then define the optimal farming locations in this area.…”

Section: 8mentioning

confidence: 99%

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Copernicus Marine Service Ocean State Report, Issue 3

Schuckmann¹,

Traon²,

Smith³

et al. 2019

Journal of Operational Oceanography

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Section: 8supporting

confidence: 91%

Section: 8mentioning

confidence: 99%

Section: 8mentioning

confidence: 99%

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Copernicus Marine Service Ocean State Report, Issue 3

Schuckmann¹,

Traon²,

Smith³

et al. 2019

Journal of Operational Oceanography

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“…In intermediate and offshore areas, conventional in situ and low-resolution data were too scarce to provide an assessment result for each geographical assessment unit. Consequently, spatially gridded (1.2 km resolution), monthly averaged (from daily images) chlorophyll-a (Chl-a) concentrations and turbidity were derived from the merging of SeaWiFS, MERIS, MODIS/AQUA, and VIIRS remote-sensing reflectance, processed by the coastal OC5 algorithm with Look-Up-Tables dedicated to each sensor [16,17] ( Table 1). The OC5 algorithm was specifically designed for waters where suspended sediment may hamper the application of the classical OCx algorithms as used for the open ocean [18,19].…”

Section: Datasetsmentioning

confidence: 99%

“…Only data with a quality control flag "good" (all QC test passed) were used. Validation of satellite-and modeling-derived products were done using classical methodologies (comparison between satellite products and in situ datasets using specific statistics as relative bias, correlation coefficients, Relative Standard Deviation, Root Mean Square Error, Taylor Diagrams) [17]. Table 2.…”

Section: Data Quality Quantity and Confidencementioning

confidence: 99%

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea

Lefebvre

Devreker

2020

JMSE

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The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of assessment levels and thresholds, (ii) development of methodology for aggregation and integration of data, and (iii) qualification of the Environmental Status. We investigated how reliable this assessment procedure was when considering other complementary information. Results highlighted that, despite efforts in recent decades to reduced nutrient inputs, the pressure on coastal marine ecosystems was still high. We discuss options for improving the coherence between MSFD and other similar approaches and associated monitoring programs. This study identifies areas where an increased monitoring effort is needed to improve the assessment and where environmental management actions are of priority.

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Remote Sensing and Geographic Information Systems Driven Data Analysis

Singh,

Paul

et al. 2024

Water Science and Technology Library

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Twenty years of satellite and in situ observations of surface chlorophyll-a from the northern Bay of Biscay to the eastern English Channel. Is the water quality improving?

Cited by 64 publications

References 47 publications

Copernicus Marine Service Ocean State Report, Issue 3

Copernicus Marine Service Ocean State Report, Issue 3

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea

Remote Sensing and Geographic Information Systems Driven Data Analysis

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