Journal article

Exploring the atmospheric chemistry of nitrous acid (HONO) at a rural site in Southern China

Li X, Brauers T, Häseler R, Bohn B, Fuchs H, Hofzumahaus A, Holland F, Lou S, Lu K, Rohrer F, Hu M, Zeng L, Zhang Y, Garland R, Su H, Nowak A, Wiedensohler A, Takegawa N, Shao M, Wahner A ...see all

Atmos. Chem. Phys. Atmospheric Chemistry and Physics, vol. 12 (2012) pp. 1497-1513

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Abstract

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 meteorolog-ical 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 NO 2 to HONO conversion on ground surfaces and the OH + NO reaction. In addition to ele-vated nighttime mixing ratios, measured noontime values of ≈200 ppt indicate the existence of a daytime source higher than the OH + NO→HONO reaction. Using the simultane-ously 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 com-pares well to previous measurements in other environments. Our analysis of P M provides evidence that the photolysis of HNO 3 adsorbed on ground surfaces contributes to the HONO formation.

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Authors

  • X Li

  • T Brauers

  • R Häseler

  • B Bohn

  • H Fuchs

  • A Hofzumahaus

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