Vol. 38, issue 06, article # 9

Abstract:

In environmental studies of atmospheric pollution, information is needed on the physical processes that determine the spatiotemporal distribution of aerosol fields. The article presents the results of lidar studies of the troposphere in the summer period from 2015 to 2023 on Lake Baikal, at the Boyarsky research station of Institute of Physical Material Science SB RAS, the Republic of Buryatia. Observations were carried out using LOSA lidars. Three main types of meteorological situations typical for the coastal zone of southern Baikal in the summer period, which determine generation and transport of aerosol in the atmosphere, are considered: breeze circulation, southwesterly transfer, and change of air masses. The features of the daily dynamics of the spatial distribution of aerosol in the atmosphere are given for the three specified types of situations. In the first case, the main changes are observed in the lower 2–3 km layer of the troposphere. During the day, due to the wind from the lake, the aerosol in the lower part of the atmosphere (below 1 km) begins to “press to the ground” and does not rise to the overlying layers. A distinctive feature of the second type of situations is that aerosol layers were detected at fairly high altitudes of up to 5–7 km. The third type is characterized by a smooth decrease of the observed aerosol layers throughout the range of altitudes down to the ground layer during the day. The results of two-position synchronous lidar observations of the transport of atmospheric heterogeneities at different altitudes above the coastal zone of Lake Baikal are also presented; it was revealed that the transport velocity can greatly vary, reaching several tens of meters per second.

Keywords:

Lake Baikal, aerosol, lidar, planetary boundary layer, meteorological parameters, breeze circulation

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