国庆期间南岭背景大气中PAN的浓度特征与来源

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Abstract To evaluate the influence of the frequent large-scale regional photochemical pollution events on the background atmosphere in South China during the National Day holiday, continuous online observations of peroxyacetyl nitrate (PAN) a representative product of photochemical pollution, were conducted for the first time at Nanling National Atmospheric Background Monitoring Station in Guangdong, around the National Day of 2018 (September 19^th~October 19^th). The concentration characteristics and sources of PAN were also analysed. The average volume concentration of PAN during the period was (0.66 ±0.54)×10^-9, with the maximum value of 2.33×10^-9, which was significantly higher than other background sites in China and abroad ((0.21 ~ 0.44)×10^-9), and the concentration at night was constantly high. Additionally, PAN correlated well with O₃ (r= 0.90) and NO₂ (r = 0.87), and the atmospheric background volume concentration of O₃ was estimated to be (46.22 ±0.65)×10^-9by a linear fitting method, indicating that the photochemical reaction at Nanling was active. As a result of the regional photochemical pollution events, the concentrations of PAN at Nanling site increased significantly during the National Day holiday, reaching (1.18 ±0.45)×10^-9,while NO/NO₂ ratio decreased during the same period, resulting in a prolonged atmospheric lifetime of PAN and contributing to local accumulation of PAN. Combining the backward trajectory of the air mass, the distribution of potential sources and the nationwide distribution characteristics of the precursor NO₂, it was found that the high concentration of PAN during the National Day holiday at Nanling site mainly came from Hunan, Hubei, Henan, Jiangxi and other central regions of China.

Key words： peroxyacetyl nitrate atmospheric oxidation forest background station Tianjing mountain

Received: 23 December 2020

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X511

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	Articles by authors
	LIAO Min-ping
	GONG Dao-cheng
	WANG Shao-xia
	LIU Tao
	WANG Hao
	DENG Shuo
	OU Jie
	ZHENG Yu
	WANG Bo-guang

Cite this article:

LIAO Min-ping,GONG Dao-cheng,WANG Shao-xia等. Concentration characteristics and sources of PAN at Nanling background station during the National Day holidays[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2493-2503.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2493

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