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Modelling the Particulate Backscattering Coefficients of Turbid and Productive Coastal Waters

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Abstract

An optical model is developed to predict the spectral backscattering coefficients of phytoplankton (bbph(λ)) and non-living particles (bbss(λ)) in turbid and productive coastal waters. This model computes bbph(λ) and bbss(λ) values based on the measured absorption and attenuation coefficients and water constituents’ concentrations. The predicted values are validated with independent in-situ data from four different water types and compared with results from the independent model. The findings revealed that, in sediment-dominated coastal waters, the backscattering coefficient of phytoplankton is relatively smaller than that of non-living particles. In productive waters, the contribution by phytoplankton is significant due to high chlorophyll a concentration and the influence of complex morphology, intracellular structure and composition of phytoplankton. The results further showed that living algal matter in turbid productive waters may have a significant influence on the backscattering process and its spectral dependency which will have important implications for our understanding of the relationship between the backscattering to scattering ratio, particle size distribution and related properties.

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Acknowledgments

This research was supported by the Department of Science and Technology (DST), Government of India (OEC1819150-DSTXPSHA). We would like to thank D. Rajasekhar, The Head, Vessel Management Cell (VMC), and Director of National Institute of Ocean Technology (NIOT) for providing the coastal research vessels to Indian Institute of Technology (IIT) Madras, Chennai, India and for making various biooptical measurements in coastal waters on the southeast part of India. We are thankful to the anonymous reviewers for their valuable comments and suggestions which helped to improve the contents and quality of this manuscript.

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Correspondence to V. Gomathisankaraprasad Harharasudhan.

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Gomathisankaraprasad Harharasudhan, V., Shanmugam, P. Modelling the Particulate Backscattering Coefficients of Turbid and Productive Coastal Waters. Ocean Sci. J. 54, 147–164 (2019). https://doi.org/10.1007/s12601-019-0012-z

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  • DOI: https://doi.org/10.1007/s12601-019-0012-z

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