Arid Zone Research ›› 2024, Vol. 41 ›› Issue (5): 730-741.doi: 10.13866/j.azr.2024.05.02

• Weather and Climate • Previous Articles     Next Articles

Properties of aerosol scattering and its influencing factors in semiarid areas of Inner Mongolia

YE Hu1,2(), PEI Hao2,3(), JIANG Yanfeng2,4, NA Qing2,5, ZHANG Liwei2,6   

  1. 1. Inner Mongolia Service Center of Meteorology, Hohhot 010051, Inner Mongolia, China
    2. Inner Mongolia Desert Ecological Meteorological Center, Hohhot 010051, Inner Mongolia, China
    3. Inner Mongolia Meteorological Bureau, Hohhot 010051, Inner Mongolia, China
    4. Inner Mongolia Meteorological Science Research Institute, Hohhot 010051, Inner Mongolia, China
    5. Inner Mongolia Meteorological Data Center, Hohhot 010051, Inner Mongolia, China
    6. Xilin Gol League Meteorological Bureau, Xilinhot 026000, Inner Mongolia, China
  • Received:2023-08-29 Revised:2023-11-06 Online:2024-05-15 Published:2024-05-29

Abstract:

From observational data of scattering coefficients, the mass concentrations of aerosols and pollutants, and meteorological elements, collected from July 9, 2020 to July 8, 2023 in Xilinhot, the characteristics of aerosol scattering coefficients—including the variation over time, probability density distribution, and correlation with different types of aerosols and meteorological impact factors—are studied. Consequently, the scattering coefficient levels are classified. The results show that: (1) the overall level of aerosol scattering is relatively low, but the transport of dust aerosol in spring and the high frequency of temperature inversions in winter and at night may increase aerosol scattering. (2) The smaller the aerosol, the higher the correlation between aerosols and scattering coefficients, with the correlation coefficients following the order BC>PM2.5>PM10, although seasonal differences are observed. In addition, NO2 is an important factor in increasing scattering in autumn, whereas SO2 contributes to scattering in summer, autumn, and winter. (3) The increases in correlation coefficients are considered as the contribution rates of current meteorological factors to scattering coefficients, with contribution rates of between 1% and 2%.

Key words: the semiarid area, aerosol, scattering coefficient, gradation, contribution rate, Inner Mongolia