Aerosol extinction hygroscopic growth is one of the important parameters to characterize the hygroscopic properties of aerosols, as well as explore the environmental effects of aerosols and evaluate air quality. In this paper, the variation characteristics of aerosol extinction factor, atmospheric visibility (VIS) and relative humidity (RH) were analyzed based on the measurements in Hefei during winter (from December 2021 to January 2022). It is shown that the aerosol extinction coefficient (VIS) is positively (negatively) correlated with RH, especially in high-RH environments where the extinction coefficient (VIS) is extremely high (extremely low). Based on four commonly used empirical parameterization schemes of aerosol extinction hygroscopic growth factor, an empirical model of aerosol extinction hygroscopic growth factor for winter in Hefei is presented. There is no significant difference in the parameterization results of the four models, which are able to express the variation characteristics of aerosol extinction hygroscopic growth with RH, but the simulations of the four models are higher than the observations in high-RH environment.
As one of the current scientific research hotspots, atmospheric aerosol not only affects human health and environmental quality, but also has an important impact on atmospheric radiation transmission, laser engineering and other fields. In this paper, we used multi-rotors UAV as a platform, equipped with Portable Optical Particle Profiler (POPS) and meteorological parameter instrument to measure near-surface aerosol properties in Hefei, China, and analyzed the characteristics of aerosol particle number concentration, effective radius and vertical spectrum distribution. The results show that in Hefei, the concentration of aerosol particles in the near-surface layer varies significantly from day to day. The size distribution of aerosol particle shows "double peaks", which can be described by the superposition of two modes. The peak centers are at 0.18 μm and about 0.5 μm. In this study, the physical parameters of aerosols obtained by UAVs can be used to calculate the optical properties of aerosols. It also provides technical support for the subsequent research of aerosols in the modeling of atmospheric aerosols in the region.
Mie-scattering lidar is an active remote sensing tool for inverting atmospheric properties by detecting the interaction between lasers and various molecules and aerosol particles in the atmosphere. It has become a powerful detection tool for atmospheric aerosols. However, whether it is a coaxial or parallel-axis laser radar, the accuracy of measurement and inversion in the blind zone and transition zone needs to be improved. This paper studies and establishes a new method of the Mie scattering lidar extinction profile correction based on the UAV-borne aerosol radiosonde. In this method, the UAV (unmanned aerial vehicle) is equipped with an optical aerosol radiosonde (Portable Optical Particle Profiler, POPS), and measures particle spectrum information and related meteorological parameters in the same detection path as lidar. Therefore, by using the Mie scattering theory simulation, the aerosol extinction profile in the lidar short-range blind zone and transition zone can be derived from the UAV-borne aerosol radiosonde data. The horizontal measurement verification test shows that the near-ground extinction coefficient by the new UAV method is in good agreement with that obtained by the lidar Collis slope method.
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