基于无人机观测的不同污染天气O<sub>3</sub>垂直分布特征

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Abstract 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 afternoon. 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 NO_x 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.

Key words： O₃ unmanned aerial vehicles vertical distribution regional transportation O₃ generation sensitivity

Received: 28 April 2024

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	GUO Wei
	ZHU Ling-yun
	LI Yan-yu
	CHEN Ling
	YAN Shi-ming
	LI Yi-ge

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GUO Wei,ZHU Ling-yun,LI Yan-yu等. Vertical distribution characteristics of O₃ under diverse polluted weather based on unmanned aerial vehicle observations[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6578-6589.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I12/6578

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