%0 Journal Article
%A Li, X.
%A Brauers, T.
%A Häseler, R.
%A Bohn, B.
%A Fuchs, H.
%A Hofzumahaus, A.
%A Holland, F.
%A Lou, S.
%A Lu, K.D.
%A Rohrer, F.
%A Hu, M.
%A Zeng, L.M.
%A Zhang, Y.H.
%A Garland, R.M.
%A Su, H.
%A Nowak, A.
%A Wiedensohler, A.
%A Takegawa, N.
%A Shao, M.
%A Wahner, A.
%T Exploring the atmospheric chemistry of nitrous acid (HONO) at a rural site in Southern China
%J Atmospheric chemistry and physics
%V 12
%@ 1680-7316
%C Katlenburg-Lindau
%I EGU
%M PreJuSER-20012
%P 1497 - 1513
%D 2012
%Z This work was supported by the China National Basic Research and Development Program 2002CB410801, and the National High Technology Research and Development Program of China (863 Program) 2006AA06A301.
%X We performed measurements of nitrous acid (HONO) during the PRIDE-PRD2006 campaign in the Pearl River Delta region 60 km north of Guangzhou, China, for 4 weeks in June 2006. HONO was measured by a LOPAP in-situ instrument which was setup in one of the campaign supersites along with a variety of instruments measuring hydroxyl radicals, trace gases, aerosols, and meteorological parameters. Maximum diurnal HONO mixing ratios of 1-5 ppb were observed during the nights. We found that the nighttime build-up of HONO can be attributed to the heterogeneous NO2 to HONO conversion on ground surfaces and the OH + NO reaction. In addition to elevated nighttime mixing ratios, measured noontime values of approximate to 200 ppt indicate the existence of a daytime source higher than the OH + NO -> HONO reaction. Using the simultaneously recorded OH, NO, and HONO photolysis frequency, a daytime additional source strength of HONO (P-M) was calculated to be 0.77 ppb h(-1) on average. This value compares well to previous measurements in other environments. Our analysis of P-M provides evidence that the photolysis of HNO3 adsorbed on ground surfaces contributes to the HONO formation.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000300656500017
%R 10.5194/acp-12-1497-2012
%U https://juser.fz-juelich.de/record/20012