Presence of high nitryl chloride in Asian coastal environment and its impact on atmospheric photochemistry  

作　　者：Yee Jun Tham Chao Yan Likun Xue Qiaozhi Zha Xinfeng Wang Tao Wang 

机构地区：[1]Department of Civil and Environmental Engineering, Hong Kong Polytechnic University [2]Environment Research Institute, Shandong University

出　　处：《Chinese Science Bulletin》2014年第4期356-359,共4页

基　　金：supported by the Research Grants Council of Hong Kong(PolyU5015/12P)

摘　　要：Nitryl chloride(ClNO2)is a product of nocturnal halogen activation of nitrogen oxides and has potential to impact atmospheric photochemistry.Here we report the first observation result of ClNO2in an Asian environment.The measurements were made with a thermal decomposition chemical ionization mass spectrometer at a coastal site in southern China during late summer of 2012.A clear diurnal pattern of ClNO2was observed with nighttime 1-min average mixing ratio up to 1997 pptv,which is among the highest values ever reported in the world.The elevated ClNO2mixing ratios were observed in plumes from Hong Kong and the Pearl River Delta region compared to the lower levels in maritime air.Calculations suggest that the production of chlorine atom from photolysis of ClNO2in the early morning exceeds the production of hydroxyl radical via ozone photolysis by several factors.Therefore,ClNO2plays an important role in jump-starting the atmospheric photochemistry in polluted marine boundary layer of southern China.Nitryl chloride （C1NO2） is a product of noc- turnal halogen activation of nitrogen oxides and has potential to impact atmospheric photochemistry. Here we report the first observation result of C1NO2 in an Asian environment. The measurements were made with a thermal decomposition chemical ionization mass spectrometer at a coastal site in southern China during late summer of 2012. A clear diurnal pattern of CINO2 was observed with nighttime 1-min average mixing ratio up to 1997 pptv, which is among the highest values ever reported in the world. The elevated CINO2 mixing ratios were observed in plumes from Hong Kong and the Pearl River Delta region compared to the lower levels in maritime air. Calculations suggest that the production of chlorine atom from photol- ysis of C1NO2 in the early morning exceeds the production of hydroxyl radical via ozone photolysis by several factors. Therefore, C1NO2 plays an important role in jump-starting the atmospheric photochemistry in polluted marine boundary layer of southern China.

关 键 词：大气光化学 环境 沿海 亚洲 酰氯 化学电离质谱 光化学反应 珠三角地区 

分 类 号：X13[环境科学与工程—环境科学]