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Arid Land Geography ›› 2022, Vol. 45 ›› Issue (5): 1426-1439.doi: 10.12118/j.issn.1000-6060.2022.056

• Climate Change • Previous Articles     Next Articles

Aircraft observation and analysis of vertical distribution of aerosols in winter in Turpan and Ruoqiang

ZHENG Bohua1(),CHEN Sheng1,LI Yuanyuan1(),FAN Ruxia2,KONG Lingwen1,HAO Lei1   

  1. 1. Weather Modification Office of Xinjiang Uygur Autonomous Region, Urumqi 830002, Xinjiang, China
    2. Inner Mongolia Institute of Meteorological Sciences, Hohhot 010051, Inner Mongolia, China
  • Received:2022-02-16 Revised:2022-06-13 Online:2022-09-25 Published:2022-10-20
  • Contact: Yuanyuan LI E-mail:115125991@qq.com;48307374@qq.com

Abstract:

The vertical changes to aerosol particle number concentration and average diameter in two areas during aircraft climb or landing were studied using a total of 14 airborne aerosol detection data in Turpan City, Xinjiang, China in the winter of 2019 and Ruoqiang County, Xinjiang, China in the winter of 2020, combined with macro weather and air pollution data. The characteristics of particle spectrum distribution at different heights were analyzed. The result shows: (1) There are obvious differences in the aerosol particle number concentration and particle diameter of aerosol particles in the two places in winter. In the absence of obvious weather change, the average aerosol particle number concentration data for Ruoqiang is significantly higher than that for Turpan; there is little difference in terms of average particle diameter between the two places, but the number of large-diameter particles in Turpan was higher than that for Ruoqiang, which was closely related to the presence of more dust aerosols in Turpan. (2) The aerosol particle number concentration and average particle diameter in the two places were significantly affected by weather processes such as strong wind and precipitation, as well as the temperature inversion layer. High wind process causes an increase in particle number concentration, and there is a slow updraft before the snowfall process, resulting in the aerosol particle number concentration that is 3-4 times higher than the average value. (3) In general, the upper layers of Ruoqiang and Turpan mainly contain imported aerosols, and the lower layers are mainly localized. The issue of environmental damage and air pollution is especially serious. Under clear sky or cloudy weather conditions, the aerosol particle number concentration is generally higher in Ruoqiang than in Turpan, indicating that the number of larger diameter particles in Ruoqiang is relatively less than that in Turpan, and its geographical location determines this. There are fewer industrial activities and fewer anthropogenic activities, so there are fewer particles emitted by humans. From the analysis of the aerosol particle number concentration and average diameter, it is believed that this area primarily has a large number of small dust aerosols. (4) The particle spectrum distribution in Turpan and Ruoqiang (0.10-3.00 μm diameter) is a single-peak and double-valley distribution; the peak is mainly concentrated at 0.4 μm, and the valley is mainly concentrated between 0.15 μm to 1.60 μm. The comparison of particle size similarity between the three modes shows that there is little difference in the number spectrum distribution in the first mode in Turpan or Ruoqiang, and the similarity is high. When there is an obvious weather process, the similarity of the Turpan aerosol number spectrum in the second and third modes drops sharply, and if only the third mode changes significantly, it indicates that the temperature inversion layer inhibits particle diffusion and hinders convective movement.

Key words: aerosol, aircraft measurement, vertical distribution, aerosol particle number concentration, particle diameter