Search

In order to study the pollution status of NO2 and SO2 in Karamay city, Xinjiang, and understand their spatial and temporal distribution characteristics and influencing factors, Li Zid-based multi-axis differential absorption spectrometer (MAX-DOAS) was used to conduct fixed-point monitoring and vehicle-mounted mobile round-town monitoring in Karamay City to obtain the concentration data of NO2 and SO2 vertical columns in 2018. The daily variation of NO2 and SO2 shows a U-shaped characteristic. The concentration of NO2 vertical column is generally higher during 9: 00 - 11: 00, 17 : 00 - 19: 00, and lower during 11: 00 - 17 : 00. The vertical column concentration of SO2 is generally higher during 11: 00 - 13 : 00, 15 : 00 - 17 : 00, and lower during 13 : 00 - 15 : 00, namely high in the morning and evening low at noon. The seasonal variation of NO2 and SO2 shows a characteristics of winter > autumn > spring and summer. On the whole, the concentration of NO2 vertical column is higher than that of SO2 vertical column. The concentration of NO2 vertical column and SO2 vertical column is closely related to wind direction and wind speed, showing that the higher the wind speed is, the greater the pollution range is. And because of the special geographical conditions and meteorological factors, the pollutants are difficult to disperse in time. Backward trajectory analysis shows that the pollutants mainly come from other places. Among the influences of air mass transmission from the external regions, Karamay city is mainly affected by the long-distance transmission of air mass from the northwest (accounting for 51. 12% ~ 75. 83%) and the short-distance transmission of air mass from the east (accounting for 14. 0% ~ 26. 37%). [ABSTRACT FROM AUTHOR]