前体物与气象因子对珠江三角洲臭氧污染的影响

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Abstract

Based on the hourly data of O₃, NO_x, and VOCs concentration from China Meteorology Administration (CMA) Guangzhou Panyu Atmospheric Composition Observation Station, and the meteorological data, such as temperature, relatively humidity and wind data from Guangzhou meteorology observation station, the impacts of ozone precursors (NO_x, VOCs) and meteorological factors on O₃ pollution in the Pearl River Delta (PRD) have been researched. It was found that the monthly variations of O₃ and NO_x were single-peak distribution with the peak concentrations were (104.9±68.0)μg/m³, (131.1±122.1)μg/m³in October and March, respectively. And the diurnal variation of O₃ also was unimodal distribution that the O₃ concentration was highest in the afternoon. While NO_x concentration had an obvious increase during rush time, and NO_x concentration in the nighttime was much higher than daytime. The titration of NO_x played an important role in O₃ pollution that O₃ concentration was exponentially suppressed with increasing NO_x concentration. High temperature and low relatively humidity condition was in favor of O₃ formation. Similar with NO_x, O₃ concentration was also exponentially suppressed with increasing relatively humidity, while the relationship between O₃ and temperature was opposite that O₃ concentration was exponentially increased with increasing temperature. When western wind was prevailed in the PRD region, O₃ concentration of downward area was highest, while when PRD was controlled by northern wind, O₃ concentration was lowest companied with the highest NO_x concentration, it also suggests that the titration of NO_x in O₃ concentration. In general, the key factors for photochemical pollution occurred in PRD region were NO_x concentration of 20~40μg/m³, temperature with higher than 27℃, relatively humidity with lower than 55% and western wind dominant, respectively. The formation of O₃ in October was controlled by VOCs, and the contribution of alkenes to ozone production potential was highest, which was 69%. While the contributions of alkanes and aromatics were much lower, were only 15%, 16%, respectively.

Key words： ozone nitrogen oxide VOCs meteorological factor Pearl River Delta

Received: 04 July 2016

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X515

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	Articles by authors
	LIU Jian
	WU Dui
	FAN Shao-jia
	LIAO Zhi-heng
	DENG Tao

Cite this article:

LIU Jian,WU Dui,FAN Shao-jia等. Impacts of precursors and meteorological factors on ozone pollution in Pearl River Delta[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 813-820.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I3/813

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