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Study on the temporal and spatial distribution of atmospheric SO2 and NO2 in Huainan observed by Lidar

In order to initially explore the different temporal and spatial distribution characteristics of sulfur dioxide (SO2) and nitrogen dioxide (NO2) concentrations in Huainan, the gas concentration detections were carried out at Huainan Academy of Atmospheric Sciences by the differential absorption laser radar system of Anhui Institute of Optics and Fine Mechanics. According to the detected distribution profiles of atmospheric SO2 and NO2 concentrations in part of the months from July 2016 to June 2017, in this paper, the typical examples are selected to analyze the distribution characteristics of SO2 and NO2 from three aspects: diurnal variations of horizontal concentration, vertical concentration changes and monthly variations of horizontal concentration. According to the SO2 and NO2 concentration distribution profiles in the selected examples, the following conclusions can be drawn:(1) The concentrations of SO2 and NO2 at night are greater than that of SO2 and NO2 in the afternoon on the same day;(2) The vertical concentrations of SO2 and NO2 decrease with the increasing height;(3) The monthly variations of SO2 and NO2 horizontal concentration are the highest in the winter months, and the lowest in the summer months, followed by the spring and autumn months. The changes in SO2 and NO2 concentrations are the result of a combination of population activities and changes in meteorological conditions.