The relationship between Suspended Particulate Matter and Turbidity at a mooring station in a coastal environment: consequences for satellite-derived products

• Autorzy: Jafar-Sidik M. , Gohin F. , Bowers D. , Howarth J. , Hull T.

Identyfikatory

DOI

10.1016/j.oceano.2017.04.003

• Języki publikacji: EN

Abstrakty

EN

From a data set of observations of Suspended Particulate Matter (SPM) concentration, Turbidity in Formazin Turbidity Unit (FTU) and fluorescence-derived chlorophyll-a at a mooring station in Liverpool Bay, in the Irish Sea, we investigate the seasonal variation of the SPM: Turbidity ratio. This ratio changes from a value of around 1 in winter (minimum in January-February) to 2 in summer (maximum in May-June). This seasonal change can be understood in terms of the cycle of turbulence and of the phytoplankton population that affects the nature, shape and size of the particles responsible for the Turbidity. The data suggest a direct effect of phytoplankton on the SPM: Turbidity ratio during the spring bloom occurring in April and May and a delayed effect, likely due to aggregation of particles, in July and August. Based on the hypothesis that only SPM concentration varies, but not the mass-specific backscattering coefficient of particles b_bp *, semi-analytical algorithms aiming at retrieving SPM from satellite radiance ignore the seasonal variability of b_bp * which is likely to be inversely correlated to the SPM: Turbidity ratio. A simple sinusoidal modulation of the relationship between Turbidity and SPM with time helps to correct this effect at the location of the mooring. Without applying a seasonal modulation to b_bp *, there is an underestimation of SPM in summer by the Ifremer semi-analytical algorithm (Gohin et al., 2015) we tested. SPM derived from this algorithm, as expected from any semi-analytical algorithm, appears to be more related to in situ Turbidity than to in situ SPM throughout the year.

Słowa kluczowe

EN

Turbidity; suspended matter; MODIS; Irish Sea

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2017
• Tom: No. 59 (3)
• Strony: 365--378
• Opis fizyczny: Bibliogr. 44 poz., mapy, tab., wykr.

Twórcy

autor

Jafar-Sidik M.

• Borneo Marine Research Institute, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
• School of Ocean Sciences, Bangor University, Anglesey, United Kingdom

autor

Gohin F.

• Ifremer, Dyneco/Pelagos, Centre Ifremer de Brest, Plouzane, France

autor

Bowers D.

• School of Ocean Sciences, Bangor University, Anglesey, United Kingdom

autor

Howarth J.

• National Oceanography Centre, Joseph Proudman Building, Liverpool, United Kingdom

autor

Hull T.

• Centre for Environment, Fisheries and Aquaculture Science (Cefas), Lowestoft, United Kingdom

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