Identification of Ozone Formation Mechanism Long-term Spatio-temporal Evolutions in Hunan Province
Ozone(O3)pollution has become the primary pollutant in the atmospheric environment of major urban areas in China.Due to the highly nonlinear relationship between O3 and its precursors,the identification of O3 formation mechanism(OFM)is fundamental to emission restraining.In this study,based on the relationship between ambient temperature and volatile organic compounds activity(VOCR)and O3 and NO2 conventional observation data from 2015 to 2021 in Hunan,OFM was identified from the two dimensions of NO2 and temperature.And then OFM was verified to ensure accuracy.Results show that O3 concentration exhibit complex fluctuation characteristics with changes in NO2 and presents an overall upward trend with increasing temperature.Overall,NOx-limited,transitional and VOCR-limited were corresponded to NO2 in 0～15 μg/m3,15-20 μg/m3,and more than 20 μg/m3 and temperature lied in higher than 31 ℃,24～31 ℃,and lower than 24 ℃,respectively.Averagely during 2015 to 2021,VOCR-limited and NOx-limited lied in the northeast and southwest of Hunan,respectively.OFM identified from NO2 and temperature dimension are consistent.The transitional tended to the VOCR-limit-ed in the southwest with time.O3 formation was more related to NOx as temperature increased,and it tend to transitional and NOx-limited from VOCR-limited and transitional as temperature increase.
万方数据
维普
