Case Study of the Aerosol Optical Properties in the Atmosphere over Wuhan, China

摘要

The research on regional aerosol optical properties is of great significance for exploring climate regulation mechanisms and controlling atmospheric pollution. Based on the solar radiation observation platform, a three-month optical observation of atmospheric aerosols was conducted in Wuhan, China. The daily and monthly variation characteristics of aerosol optical depth (AOD(550)), Angstrom parameter (& alpha;(440-870)), and turbidity coefficient (& beta;) were revealed, and the interrelations between the three optical parameters were fitted. Then, the potential relationships between atmospheric particulate matter (PM2.5, PM10) with AOD(550) and & beta; were discussed. The results show that the average values of AOD(550), & alpha;(440-870), and & beta; in this case study are 0.42, 1.32, and 0.20, respectively. The frequency distribution patterns of the three optical parameters are all unimodal. AOD(550) has a good linear correlation system with & beta;, and the Pearson correlation coefficient reaches 0.94, while its correlation with & alpha;(440-870) is not significant. The daily variation in AOD(550) and & beta; both show an increasing trend, and their monthly increases are more than 50%. However, the daily variation in & alpha;(440-870) is relatively stable, and the fitted line is a nearly horizontal line with no significant monthly variation. The fluctuation of particulate matter concentration affects the aerosol optical properties to some extent, among which & beta; has a prominent effect on the response to the change in PM2.5 concentration with a linear correlation coefficient of 0.861. As the concentration of particulate matter increases, the proportion of fine particulate matter in the atmosphere increases monthly, and the ratio of PM10 to PM2.5 concentrations decreases from 1.8:1 to 1.2:1. Atmospheric pollution conditions are frequent during this observation period, mainly at mildly turbid levels. Atmospheric turbidity shows an increasing trend month by month, and the concentration of particulate matter increases rapidly. The response of atmospheric aerosol optical properties to the changes in fine particulate matter concentration is significant, and controlling the particulate matter content in the atmosphere is an effective means to mitigate aerosol pollution.

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