广州市夏秋季HONO污染特征及白天未知源分析

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Abstract

Based on the mass concentrations and photolysis rate constant of HONO and O₃ obtained at a super site in Jinan University, Guangzhou, in October, 2015 and July, 2016, this study analyzed the diurnal variation of HONO and its seasonal pollution characteristics; estimated the contributions of HONO and O₃ to OH radicals; and investigated an unknown source of HONO during the daytime. The results showed that the average concentration of HONO was 3.15μg/m³ in the autumn, which was 1.6 times its concentration of 1.97μg/m³ in the summer. Both HONO and NO₂ showed the typical diurnal variation pattern of low concentrations during the daytime and high concentrations during the nighttime. The contribution of HONO photolysis to OH radicals in the autumn and summer was much larger than that of O₃, indicating that the photolysis of HONO in Guangzhou was probably the primary source of OH radicals. Budget analysis showed that there was an important unknown source of HONO during the daytime, and its daily contributions to HONO concentration in the autumn and summer accounted for 69% and 49% of the total source, respectively. Correlation analysis suggested that this unknown source of HONO was likely related to the light-enhanced reaction of NO₂.

Key words： OH radicals HONO O₃ photolysis unknown HONO source

Received: 25 November 2016

PACS:

X131.1

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	Articles by authors
	YANG Wen-da
	CHENG Peng
	TIAN Zhi-lin
	ZHANG He-wei
	ZHANG Man-man
	WANG Bo-guang

Cite this article:

YANG Wen-da,CHENG Peng,TIAN Zhi-lin等. Study on HONO pollution characteristics and daytime unknown sources during summer and autumn in Guangzhou, China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(6): 2029-2039.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I6/2029

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