Vertical distribution characteristics of O3 under diverse polluted weather based on unmanned aerial vehicle observations
In order to understand the vertical distribution and evolution characteristics of near-surface O3 under diverse polluted weather,33 in-situ observation experiments were conducted by the unmanned aerial vehicle(UAV)and airborne environmental meteorological equipment in Datong(clean days),Taiyuan(polluted days),and Linfen(polluted days to clean days)of Shanxi Province from August to September 2022,and the daily O3,Total Volatile Organic Compounds(TVOCs),Nitrogen Dioxide(NO2)and vertical distribution of temperature and humidity under 500m of the near-surface at 06:00,10:00,15:00,and 19:00 were obtained.The results show that the O3 concentration mainly increased with height,but decreased(Taiyuan and Linfen)or kept uniform distribution(Datong).The mass burden of NO2 and TVOCs both decrease with height.The daily change of vertical distribution of O3 in Datong was vertical increasing-uniformly distributed(or increasing and decreasing)-vertical increasing with height,while Taiyuan and Linfen were mainly vertical increasing-vertical decreasing-vertical increasing.Two types of vertical O3 daily variability caused by the regional transport at different heights were formed during the photochemical reaction period(10:00～15:00),namely,the simultaneous increase of O3 concentration in the upper air-grounding layer and the increase in the grounding layer-the basic stability in the upper air.The better the vertical diffusion conditions were,the more significant the vertical decrease of O3 would be during the pollution peak in the aftemoon.Due to the influence of the nighttime inversion layer,the O3 stored in the upper layer of the boundary layer will continue to affect the vertical distribution of O3 and the ground level concentration on the second day.The near-surface VOCs control zones in each observation city gradually changed to common control zones and NOx control zones with the rise of altitude,and the higher the O3 concentration,the higher the altitude of the VOCs control during the observation period.
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