气象条件对天津冬季低层大气中PAN浓度的影响

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Abstract The volume concentration of peroxyacetyl nitrate (PAN) in the atmosphere was measured at the Tianjin meteorological tower in the winter of 2017 by using the on-line instrument along with meteorological parameters and the back trajectory analysis to analyze the formation of high concentration PAN. The average volume concentration of PAN during the observational period was (0.57±0.54)×10^-9 with two peaks, accompanied by two heavy pollution processes. The correlation coefficient between PAN and O₃ was obviously lower than that between PAN and PM_2.5, indicating that photochemical reaction may not be the main influencing factor of PAN concentration in winter.The clustering analysis of backward trajectory and stable weather index (SWI) indicated that long-distance transportation and local accumulation may play a more important role. The rise of PAN concentration was affected by the long-range transport of the wind to the south. It also has something to do with quiet and stable weather. The meteorological conditions such as vertical profiles of temperature, relative humidity and wind, and thickness of mixing layer during a heavy polluted weather were analyzed. The results showed that increased PAN concentration was dominantly contributed by both regional transport from surrounding areas and the accumulation of pollutants in stationary weather.

Key words： peroxyacetyl nitrate (PAN) boundary layer back trajectories heavy pollution process Tianjin

Received: 20 February 2019

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X511

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	Articles by authors
	YAO Qing
	MA Zhi-qiang
	LIU Jing-le
	WANG Xiao-jia
	YANG Jian-bo
	CAI Zi-ying
	HAN Su-qin

Cite this article:

YAO Qing,MA Zhi-qiang,LIU Jing-le等. Influence of meteorological conditions on PAN concentration in the lower boundary layer atmosphere of Tianjin in winter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3161-3168.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3161

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