深圳市冬季大气中硝酸分配特征观测研究

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Abstract The particle phase fraction of total nitrate determines its lifetime in the atmosphere, but this distribution process in urban areas in winter remain poorly understood. In this study, concentrations of HNO₃, NO₃^- and related pollutants was online observed at two sites (urban site and roadside site) in Shenzhen from January 1to January 31, 2022. During the observation period, the average concentration of NO₃^- was (6.3±3.9) μg/m³, accounting for 24.7% of the mass concentration of PM_2.5, which is one of the most important components of PM_2.5 in winter in Shenzhen. The mean values of ε(NO₃^-) at two sites were (0.81±0.13) and (0.75±0.16), respectively, and the distribution of nitrate was mainly to the particle phase. ε(NO₃^-) reflected the gas-particle partitioning of nitrate, and it was higher during nighttime and lower during daytime. The higher temperature, lower humidity and more acidic environment would enhance nitrate volatilization and its partitioning to gas phase, thus driving the diurnal variation of ε(NO₃^-). In addition, aerosol liquid water content and aerosol pH were the most important factors affecting the difference of two-site ε(NO₃^-) in winter of Shenzhen, with average contribution of 41% and 31%, respectively, indicating that these two factors should be taken into consideration when modeling the formation and transformation of gaseous nitric acid.

Key words： nitric acid nitrate aerosol pH aerosol liquid water content gas-particle partitioning

Received: 05 January 2023

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X513

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	Articles by authors
	LUO Yao
	LIN Xiao-yu
	NIU Ying-bo
	YUN Long
	GU Tian-fa
	LIN Chu-xiong
	HUANG Xiao-feng
	HE Ling-yan

Cite this article:

LUO Yao,LIN Xiao-yu,NIU Ying-bo等. Observation of partitioning characteristics of gaseous nitric acid in winter of Shenzhen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3877-3885.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/3877

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