1. College of Environment Science and Engineering, Dalian Maritime University，Dalian 116026, China
2. National Marine Environmental Monitoring Center, Dalian 116023, China
Abstract Studying the influence of the spatial and size distribution of suspended particulate matter on its backscattering properties is of great importance for understanding water body scattering properties and improving inversion accuracy, which is greatly helpful for marine environmental monitoring. Based on the field data of Bohai Sea in June and September 2017, the total suspended particulate matter concentration (SPM), particle size, backscattering coefficient as well as other parameters were obtained. The results showed that the backscattering coefficient (bbp(λ)) decreased with the increase of wavelength in the visible wave bands. In summer and autumn, the changing trend of bbp(550) was consistent with that of SPM at most stations; however, the correlation coefficient R2 between them was only 0.24. In addition, the relationship between mean particle size (DA), median particle size (D50) and bbp(λ) was established in the study respectively. DA and bbp(λ) had a linear relationship, and their relationship was better in summer than in autumn by the influence of particle composition, R2 was 0.7 in summer and was only 0.3 in autumn. At the same time, it is concluded that the bbp(λ) increased with the increase of DA when the water body was dominated by small particles, but while the water body was dominated by large particles, bbp(λ) decreased with the increase of DA. D50 and bbp(λ) showed a different relationship and had a good power exponential relationship, the more small particles in the water, the higher the particle backscattering coefficients value, and the correlation coefficient was 0.66 and 0.5 in summer and autumn, respectively. The influence of particle size distribution on bbp(λ) was difficult to be determined if without considering the seasonal difference.
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