京津廊城市气团光化学污染潜势分析

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Abstract PAN online measurement, spatial source apportionment and reaction yield study were carried out in July of 2019 and 2021 in the border of Beijing, Tianjin and Hebei, to evaluate the photochemical pollution potential of air masses originating from surrounding cities. The observations showed that the mean of PAN in the studied days of 2021 was (0.89±0.21)×10^-9, about 63.8% lower than that in the studied days of 2019 [(2.45±0.71)×10^-9]. Due to the very short lifetime of PAN in summer, PAN in the border was mainly decided by the photochemical reactions of air masses from surrounding cities that carried the abundant precursors NO_x and VOCs. The yield rate of PAN presented the dual-peak pattern with the peak value of 3.08×10^-9/h and 1.75×10^-9/h respectively in July of 2019 and 2021, which was consistent with the interannual variation of PAN concentration. The higher values of potential source contribution function (PSCF) of PAN appeared within 50 km southeast of the PAN observation site in both studied months, indicating the bigger contribution of air mass transport from Tianjin to PAN in the border. The PAN formation potential and precursor NO₂ were both the highest when the observation site was absolutely controlled by Tianjin air masses, which was about 2.03 and 2.01 as higher as those under Beijing air masses, and about 1.53 and 1.21 as higher as those under Langfang air masses. These indicated that the photochemical pollution potential of Tianjin air masses was the highest, which prominence compared to Beijing air masses mainly resulted from NO_x and which compared to Langfang air masses resulted from both NO_x and VOCs precursors.

Key words： PAN photochemical pollution potential Beijing-Tianjin-Lang region urban air mass

Received: 27 October 2021

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	WANG Xing-feng
	WEI Wei
	LI Rui
	CHEN Kang
	WANG Xiao-qi
	CHENG Shui-yuan

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WANG Xing-feng,WEI Wei,LI Rui等. Analysis of photochemical pollution potential of air masses from various cities in Beijing-Tianjin-Langfang border[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 1985-1993.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/1985

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