Numerical simulation of light propagation in an integrating sphere containing a quartz layer between the cavity for water sample and fluorilon has been performed using Monte-Carlo method. It was shown that the use of the Lambertian model with a single parameter albedo is a good replacement for BRDF obtained by numerical simulation of light propagation in fluorilon. In addition, it was shown that for a given fluorilon configuration, there is an unambiguous relationship between the albedo and the transport scattering parameter, which depends on the scattering coefficient of fluorilon and the mean cosine of the phase function. This dependence is shown variations with a change in the fluorilon thickness and its absorption coefficient value.
To test and modify the algorithms, we used values of total suspended matter concentration (TSM) measured on cruises 72, 76, and 81 of the R/V «Akademik Mstislav Keldysh» in 2018-2020, and data of MODIS and OLCI satellite ocean color scanners. The test showed that the previously developed regional SIO RAS algorithm gives underestimates, which are mostly noticeable in turbid waters. It is also shown that the standard neural network OLCI algorithm greatly overestimates TSM values. Based on the MODIS data, two new formulas have been derived for calculating TSM with using the backscattering coefficient of suspended particles bbp obtained with different algorithms. According to the satellite data verification, it is best to use the new regional algorithm with bbp values calculated with the quasi-analytical QAA algorithm.
Analysis of bio-optical and hydrochemical characteristics was performed on samples taken along the route of the vessel in five seas: the Baltic, North, Norwegian, Barents and White. It has been shown that the values of the absorption coefficient of colored dissolved organic matter, as well as the concentrations of silicates, can be used to assess the developmental stages of phytoplankton. Simultaneous measurements of fluorescence and colored dissolved organic matter absorption coefficient made it possible to see a clear separation of the optical properties of the studied seas.
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