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<p>Results of lidar observations of atmospheric aerosol in the coastal zone of Lake Baikal during the summer period are presented. In the comprehensive experiment, two identical LOSA lidars were used, operating in the vertical direction up to an altitude of 5&#xa0;km, positioned approximately 700&#xa0;m apart. One lidar was located on shore, while the other was onboard a research vessel at a distance of ~ 250&#xa0;m from the coast. Two episodes of synchronous lidar observations obtained in 2018-2019 under different meteorological conditions are considered. One episode corresponds to the period (2018) of a warm atmospheric front passage, the second episode occurred in 2019 under anticyclonic conditions. Differences in the vertical structure of aerosol filling in the troposphere are shown for the two presented situations, related to the synoptic situation prevailing in the region during the experiments. Also, using cross-correlation analysis of the lidar data, estimates of the transport time of aerosol inhomogeneities between the two lidars at various altitudes in the range of 0.1–5&#xa0;km were obtained. It is noted that the propagation speed of atmospheric impurities at different altitudes and in different situations can vary significantly. The most uneven vertical pattern of transport time, ranging from 4 to 8&#xa0;min, is observed during the passage of a warm front on July 18, 2018. The transport time on August 2, 2019, is noticeably lower, not exceeding 3&#xa0;min, and in most cases amounts to several tens of seconds. This is explained by the nature of both the general synoptic situation in the observation region and the features of local wind flows in the mountain basin. It is shown that the lifetime of aerosol formations, determined by the half-width of the autocorrelation functions calculated for each lidar, varies from tens to hundreds of seconds and depends randomly on altitude. Based on a joint analysis of data from the CALIOP spaceborne lidar, ground-based lidar data, and the global NAAPS aerosol model, estimates were made regarding the possible sources and types of atmospheric aerosol observed over the region.</p>

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Results of synchronous lidar studies of atmospheric aerosol transport features in the coastal zone of Lake Baikal

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • S. V. Nasonov,
  • Yu S. Balin,
  • M. G. Klemasheva,
  • G. P. Kokhanenko,
  • A. S. Nasonova,
  • M. M. Novoselov,
  • I. E. Penner,
  • T. F. Gazimov

摘要

Results of lidar observations of atmospheric aerosol in the coastal zone of Lake Baikal during the summer period are presented. In the comprehensive experiment, two identical LOSA lidars were used, operating in the vertical direction up to an altitude of 5 km, positioned approximately 700 m apart. One lidar was located on shore, while the other was onboard a research vessel at a distance of ~ 250 m from the coast. Two episodes of synchronous lidar observations obtained in 2018-2019 under different meteorological conditions are considered. One episode corresponds to the period (2018) of a warm atmospheric front passage, the second episode occurred in 2019 under anticyclonic conditions. Differences in the vertical structure of aerosol filling in the troposphere are shown for the two presented situations, related to the synoptic situation prevailing in the region during the experiments. Also, using cross-correlation analysis of the lidar data, estimates of the transport time of aerosol inhomogeneities between the two lidars at various altitudes in the range of 0.1–5 km were obtained. It is noted that the propagation speed of atmospheric impurities at different altitudes and in different situations can vary significantly. The most uneven vertical pattern of transport time, ranging from 4 to 8 min, is observed during the passage of a warm front on July 18, 2018. The transport time on August 2, 2019, is noticeably lower, not exceeding 3 min, and in most cases amounts to several tens of seconds. This is explained by the nature of both the general synoptic situation in the observation region and the features of local wind flows in the mountain basin. It is shown that the lifetime of aerosol formations, determined by the half-width of the autocorrelation functions calculated for each lidar, varies from tens to hundreds of seconds and depends randomly on altitude. Based on a joint analysis of data from the CALIOP spaceborne lidar, ground-based lidar data, and the global NAAPS aerosol model, estimates were made regarding the possible sources and types of atmospheric aerosol observed over the region.