天津市PM<sub>2.5</sub>中氮含量及同位素的昼夜及季节变化

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Abstract In order to understand the sources of nitrogen in atmospheric aerosols in Tianjin, the concentration of inorganic ions and nitrogen isotopic composition (δ¹⁵N) of total nitrogen (TN) in fine aerosols (PM_2.5) collected on day and night basis in summer and winter of 2016 were studied. The results showed that the average mass concentration of PM_2.5 in winter (207μg/m³) was much higher than that in summer (40.1μg/m³), and the δ¹⁵N value of TN in PM_2.5in winter (+5.1‰) was lower than that in summer (+10.7‰), with high enrichment of ¹⁵N in the summer. The average concentration of NH₄⁺ in PM_2.5 in summer was higher than that of NO₃^- (c(NO₃^-)), whereas in winter, it was opposite:c(NO₃^-) was higher than c(NH₄⁺), followed by c(SO₄^2-). In addition, both nitrogen contents and δ¹⁵N of TN in PM_2.5 showed significant differences between day and night in summer, but not in winter. The results demonstrated that the nitrogen loading in summer aerosols in Tianjin was significantly affected by the sea-land circulation, that is, with ocean aerosols during the day and terrestrial aerosols at night. However, East Asian monsoon in winter weakened the exchange effect of sea-land circulation, while the contribution of fossil fuel combustion source to nitrogen was more significant in winter.

Key words： atmospheric aerosols nitrogen nitrogen isotopic composition sea-land breeze Tianjin

Received: 03 August 2020

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X513

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	Articles by authors
	DONG Zhi-chao
	XU Zhan-jie
	WANG Shuang
	LI Pei-sen
	ZHAO Xue-yan
	FU Ping-qing
	LIU Cong-qiang
	Chandra Mouli Pavuluri

Cite this article:

DONG Zhi-chao,XU Zhan-jie,WANG Shuang等. Diurnal and seasonal variations of nitrogen contents and isotopic composition of total nitrogen in PM_2.5 in Tianjin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1014-1023.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1014

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