北京夏季大气HONO的监测研究  

Observational Study of Atmospheric HONO in Summer of Beijing

作　　者：朱燕舞[1] 刘文清[1] 谢品华[1] 窦科[1] 刘世胜[1] 司福祺[1] 李素文[1] 秦敏[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031

出　　处：《环境科学》2009年第6期1567-1573,共7页Environmental Science

基　　金：国家自然科学基金项目(40675072;40805015);国家高技术研究发展计划(863)项目(2006AA06A301;2007AA12Z109)

摘　　要：在2007-08-14-2007-08-24期间,利用差分光学吸收光谱（DOAS）技术,对北京市大气中HONO、NO2和O3等污染物进行了连续监测,分析了HONO和NO2的日变化特征,讨论了夜间直接排放对HONO来源的贡献,进行了24 h和夜间13 h HONO非均相反应形成与黑碳气溶胶（BC）和相对湿度（RH）等要素的相关分析.结果表明,HONO和NO2均在01：00左右达到峰值,HONO的另一峰值浓度出现在06：00,比NO2第2个峰值出现时间07：00早1 h;夜间（19：00-次日07：00）直接排放对HONO的贡献最大达到31.3%,出现在20：00,平均贡献为15%;夜间HONOcorr/NO2比率与BC和RH具有非常明显的相关性,说明HONO的非均相生成速率与NO2的浓度以及反应介质BC表面的吸附水的浓度即RH成正比,得到夜间HONO平均转化率（HONO/NO2）为0.8%·h^-1;而且RH的增加对HONO的非均相形成有利,但是当RH〉80%对反应也将产生抑制作用,通过对监测期间的个例分析也证实了这一假设.The concentration of HONO, NO2, Os and other atmospheric pollutants were observed continuously by using differential optical absorption spectroscopy （DOAS） from 2007-08-14 to 2007-08-24 in Beijing, China. Diurnal variation characteristics of HONO and NO2 were analyzed. The HONO levels originated from the nocturnal direct emission were discussed. And the correlation-between the heterogeneous formation of HONO and its related factors （BC, RH, and so on） was studied. The results showed that HONO had two peaks at about 01：00 and 06：00, respectively, while two peaks of NO2 concentrations appeared at about 01：00 and 07：00. The highest HONOemHONO ratio of 31.3% was observed at about 20：00 between 19：00 to 07：00, and the average ratio was 15%. Good correlation of HONOcerr/NO2 ratio with BC and RH at night was obtained. The correlation suggested that heterogeneous NO2 to HONO conversion processes may occur on BC surfaces by reaction with absorption water, and the average nighttime conversion frequency from NO2 into HONO （HONO/NO2） was calculated about 0.8 % ·h^-1. At the same time, the results showed that heterogeneous formation of HONO was increased with RH and inhibited at RH 〉 80 %, and the hypothesis was further supported by detailed analysis of selected case.

关 键 词：HONO 源 非均相形成 差分光学吸收光谱 

分 类 号：X511[环境科学与工程—环境工程] X831