Light beam attenuation and backscattering properties of particles in the Bohai Sea and Yellow Sea with relation to biogeochemical properties

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• 作者：Shengqiang Wang ; Zhongfeng Qiu ; Deyong Sun ; Xiaojing Shen ; Hailong Zhang
• 刊名：Journal of Geophysical Research: Oceans
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：121
• 期：6
• 页码：3955-3969
• 全文大小：1.1MB
• ISSN：2169-9291

文摘

This study reports the first results of the variability in light beam attenuation and the backscattering properties of particles and their controlling factors during the summer in the Bohai Sea (BS) and Yellow Sea (YS), which are two typical shallow and semienclosed seas. We observe large variations in the particulate beam attenuation (c_p) and backscattering coefficients (b_bp); such variations are mainly attributed to changes in the total suspended matter, while the cross-sectional area concentration shows tighter relationships with both c_p and b_bp. The mass-specific beam attenuation ( cp*) and backscattering coefficients ( bbp*) vary more widely over about two orders of magnitude. The attenuation (Q_ce) and backscattering efficiencies (Q_bbe) are important factors that control cp* and bbp*, which clearly separate all the samples into two types. Type 1 samples show low Q_ce and Q_bbe and contain relatively high proportions of organic or large particles, while type 2 samples have high Q_ce and Q_bbe and mainly contain relatively small mineral particles. The majority of the variability in cp* and bbp* within each type is related to the inverse of the product of particle apparent density (ρ_a) and mean diameter (D_A); ρ_a plays a major role, while D_A exerts only a slight impact. Overall, this study provides general knowledge of particulate beam attenuation and the backscattering properties in the BS and YS, which may improve our understanding of underwater radiative transfer processes, marine biogeochemical processes and ocean color algorithms.