1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China 2. School of Computer & Information, Hefei University of Technology, Hefei 230009, China 3. Key Lab of Environmental Optics and Technology, Chinese Academy of Sciences, and Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 4. Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei 230009, China
Abstract：Based on the scanning differential optical absorption spectroscopy (DOAS) system, field measurement of vertical profiles of HONO and NO2 was performed continuously from Aug. 27, 2007 to Sep. 4, 2007 in Chaoyang District of Beijing, and their vertical profiles were analyzed. Based on the acquired data, the typical vertical variation characteristics of HONO, NO2 and the ratio HONO/NO2 were discussed, and the possible formation sources of HONO were studied. The results indicated that the decrease of HONO with height was faster than the decrease of NO2. The study found good correlation between NO2 and HONO, as well as between the ratio HONO/NO2 and vapor, respectively. Therefore, the authors’ conclusion is that HONO was formed by heterogeneous conversion of NO2 on surfaces or near ground and then transported to higher altitudes.
