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| Titel |
Exploring the atmospheric chemistry of nitrous acid (HONO) at a rural site in Southern China |
| VerfasserIn |
X. Li, T. Brauers, R. Häseler, B. Bohn, H. Fuchs, A. Hofzumahaus, F. Holland, S. Lou, K. D. Lu, F. Rohrer, M. Hu, L. M. Zeng, Y. H. Zhang, R. M. Garland, H. Su, A. Nowak, A. Wiedensohler, N. Takegawa, M. Shao, A. Wahner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 3 ; Nr. 12, no. 3 (2012-02-08), S.1497-1513 |
| Datensatznummer |
250010642
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| Publikation (Nr.) |
 copernicus.org/acp-12-1497-2012.pdf |
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| Zusammenfassung |
| 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 ≈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 (PM) was calculated to be
0.77 ppb h−1 on average. This value compares well to previous
measurements in other environments. Our analysis of PM provides evidence
that the photolysis of HNO3 adsorbed on ground surfaces contributes to the
HONO formation. |
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