## 3 Results
### Comparison of Satellite and In Situ AOT
(pixels) closest to the stations for the Galata_Platform station (43.045; 28.193). The closest possible pixel on 12.09.2017 was a coordinate located 7.4 km from the Galata_Platform station, namely, the point with the coordinates 43.005, 28.194. On 08.09.2017, data for this pixel could not be fully restored. Among the error flags in this pixel, only STRAYLIGHT (probable straylight contamination) was noted. The results from the comparison of the satellite and AERONET measurements at the corresponding coordinates are presented in Table 2.  
Despite the similarity of the AOT and Angstrom parameter values, the correlation of the in situ and satellite remote sensing reflectance was 79%, with a clear tendency to underestimate the actual values. On the day on which the atmosphere was clean, 08.09.2017, despite the presence of turbidity, according to the MODIS data, the correspondence of the values was 88%. Best of all, in situ measurements can be reconstructed from VIIRS data, which is associated with its spatial resolution. However, due to the lack of VIIRS satellite data, a similar analysis on 12 September 2017 could not be carried out over the Black Sea. For the coastal zone of the Crimean Peninsula (the central part of the Black Sea), an analysis of the in situ measurements was carried out, which were obtained using a portable spectrophotometer, SPM. At the Marine Hydrophysical Institute of the Russian Academy of Sciences, the measurements were carried out on 08.09.2017 and 12.09.2017 (44.616; 33.517). For the Sevastopol region, the AOT and particle size distribution data were obtained from the SPM measurements, which confirmed the presence of a large number of coarse aerosol dust particles in the atmosphere above the region under study. So, for example, on 12 September 2017, at this station, the average daily value of AOT (500) was 0.37 and the Angstrom parameter on this day was 0.8. On 8 September 2017, the average daily data of FROM (500) was 0.07, which is 3 times less than the average monthly values (FROM (500) = 0.21), confirming the presence of a clean atmosphere over the studied region on this day. As noted earlier, according to the spectrophotometer data, there were obvious overestimations of AOT on the day on which dust transport occurred (12 September 2017). According to the MODIS data (Aqua), the data of the corresponding pixels were also analyzed. The closest possible pixel for comparison (44.617; 33.442) was recorded on 12.09.2017 \begin{table}
\begin{tabular}{c c c c c c} \hline  & **12.09** & **12.09** & **08.09** & **08.09** & **08.09** \\  & **Modis Aqua (10:37)** & **Galata\_Platform** (07:13)** & **Aqua (11:04)** & **VIIRS (11:11)** & **Galata\_Platform** (08:04)** \\ \hline AOT & 0.178 & 0.21 & 0.16 & 0.047 & 0.047 \\ \hline \(\alpha\) & 0.61 & 0.673 & 0.74 & 1.9098 & 1.68 \\ \hline Rrs (410 nm) & & & & 0.0018 & \\ \hline Rrs (412 nm) & \(-\)0.0002 & 0.0017 & 0.0006 & & 0.0019512 \\ \hline Rrs (443 nm) & 0.0009 & 0.00228 & 0.0016 & 0.0025 & 0.00222697 \\ \hline Rrs (486 nm) & & & & 0.00291 & \\ \hline Rrs (488 nm) & 0.0018 & 0.0029 & 0.00237 & & 0.0029 \\ \hline Rrs (531 nm) & 0.0015 & 0.00257 & 0.0020 & & 0.002263 \\ \hline Rrs (547 nm) & 0.0013 & 0.00195 & 0.00172 & & 0.0018418 \\ \hline Rrs (551 nm) & & & & 0.0018 & \\ \hline Rrs (555 nm) & 0.0011 & 0.00195 & 0.00154 & & 0.00184311 \\ \hline Rrs (667 nm) & \(-\)0.00005 & 0.00023 & 0.0001 & & 0.00033676 \\ \hline Rrs (671 nm) & & & & 0.0001 & \\ \hline \end{tabular}
\end{table} 
Table 2: MODIS (Aqua) satellite measurements and in situ measurements on a day on which dust transport occurred (12.09.2017) and a day on which the atmosphere was clean (08.09.2017) using AERONET. according to the MODIS (Aqua) AOT values at a wavelength of 869 nm (AOT (869) = 0.23), which is an indicator of atmospheric turbidity. The Angstrom parameter is also consistent with the results of the portable spectrophotometer (\(\alpha\) = 1.16 (\(\alpha\) =1.02 according to the MODIS data)). At this point, there was only one error flag: MODGLINT.