Variations of microphysical and optical characteristics of atmospheric aerosol in transition zone "land-ocean" based on data of lidar sensing

The results of variations in the microphysical and optical characteristics of atmospheric aerosol in the transition zone "land-ocean" in the Far Eastern region, Primorsky Kray, Vladivostok are analyzed. The data of measurements for the period from 21.02.2016 to 08.12.2017 are analyzed. The values of the height of the planetary boundary layer (PBL) characteristic for the region were obtained. The average value of the height of PBL for 2016 was (2605±532) m, for 2017 (2501±435) m. Seasonal changes in the height of PBL were considered and an insignificant decrease in the height of the PBL in the spring and autumn of 2017 compared with the same period in 2016, the difference was about 300 m. The values of the real and imaginary part of the refractive index of atmospheric aerosol were obtained for the period from 2016 to 2017. The predominance of an aerosol with a small value (about 1.31-1.36) of the actual part of the refractive index for 2016 compared with 2017 is noted. There are particles of large volumes (17 μm3) for altitudes up to 1 km in 2016 compared to 2017 (11 μm3). The values of the atmosphere optical depth for an altitude of up to 3 km for wavelengths of 355 nm and 532 nm are calculated. It is established that the maximum optical depth acquires in the spring period and reaches to 1.15 for a wavelength of 355 nm and to 0.51 for a wavelength of 532 nm.