Observations of nitrous acid and its relative humidity dependence in Shanghai

被引：35
|
作者：
Hao Nan [1 ]
Zhou Bin [1 ]
Chen Dan [1 ]
Chen Li-min [1 ]
机构：
[1] Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2006年 / 18卷 / 05期
基金：
中国国家自然科学基金;
关键词：
DOAS; heterogeneous formation; nitrous acid; PM10; aerosol; relative humidity;
D O I：
10.1016/S1001-0742(06)60013-2
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Nitrous acid, HNO2, is an important precursor of OH radicals in the troposphere. Measurements of HNO2 and NO,, using differential optical absorption spectroscopy (DOAS), were performed in Shanghai, China for a period from October 22, 2004 to January 4, 2005. The mean (and median) hourly concentrations of HNO2 and NO2 during this period were 1.1 (0.7) ppb and 24 (21.4) ppb respectively. A correlation between HNO2/NO2 and PM10 mass concentrations was obtained. This correlation suggests that significant heterogeneous chemical production of HNO2 may occur through NO2 reactions on aerosol surfaces. This hypothesis was further supported by detailed analysis of selected pollution episodes in this study. At the same time, the water dependence of HNO2 formation was studied by analysis of relative humidity (RH). It showed that the maximum HNO2/NO, ratio was increased along with RH below 70% and inhibited at RH > 70%.
引用
收藏
页码：910 / 915
页数：6
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