Journal
ATMOSPHERIC ENVIRONMENT
Volume 43, Issue 36, Pages 5731-5742Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2009.08.017
Keywords
Atmospheric chemistry; Air Pollution; Heterogeneous conversion; Nitrous acid; DOAS
Funding
- National Natural Science Foundation of China [40675072]
- China National Basic Research and Development Program [2002CB410801, 2002CB211605]
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The temporal behavior of HONO and NO2 was investigated at an urban site in Guangzhou city, China, by means of a DCAS system during the Pearl River Delta 2006 intensive campaign from 10 to 24 July 2006. Within the whole measurement period, unexpected high HONO mixing ratios up to 2 ppb were observed even during the day. A nocturnal maximum concentration of about 8.43 +/- 0.4 ppb was detected on the night of 24 July 2006. Combining the data simultaneously observed by different instruments, the coupling of HONC-NO2 and the possible formation sources of HONO are discussed. During the measurement period, concentration ratios of HONO to NO2 ranged from (0.03 +/- 0.1) to (0.37 +/- 0.09), which is significantly higher than previously reported values (0.01-0.1). Surprisingly, in most cases a strong daytime correlation between HONO and NO2 was found, contrary to previous observations in China. Aerosol was found to have a minor impact on HONO formation during the whole measurement period. Using a pseudo steady state approach for interpreting the nocturnal conversion of NO2 to HONO suggests a non-negligible role of the relative humidity for the heterogeneous HONO formation from NO2. (C) 2009 Elsevier Ltd. All rights reserved.
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