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| Titel |
Atmospheric HONO and NO2 measurement based on a broadband cavity enhanced UV-LED spectrometer |
| VerfasserIn |
Tao Wu, Qiaozhi Zha, Weidong Chen, Zheng Xu, Tao Wang, Xingdao He |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105645
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| Publikation (Nr.) |
 EGU/EGU2015-5179.pdf |
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| Zusammenfassung |
| Nitrous acid (HONO) is a key component in tropospheric oxidant chemistry due to its
contribution to the cycles of nitrogen oxides (NOx) and hydrogen oxides (HOx). Though
numerous laboratory, field, and modeling studies were performed to explain the observed
HONO concentrations in the atmosphere, the knowledge of atmospheric HONO chemistry is
still not well understood and sometimes controversial [1]. Accurate measurements of
HONO and its precursors with high precision should aid in understanding the HONO
chemistry.
In this paper we report on the measurements of HONO and NO2 concentrations at a
suburban site of Tung Chung in Hong Kong during a field intercomparison campaign using a
broadband cavity enhanced UV-LED spectrometer. 1Ïă detection limits of 0.3 ppbv for HONO
and 1 ppbv for NO2 were achieved with an optimum acquisition time of 120 s. The measured
HONO and NO2 concentrations were compared with the data from commercial HONO
(LOPAP) and NO2 (NOX-analyzer) measurement instrument. Typical diurnal pattern of
HONO have been observed and the potential formation sources have been analyzed
[2].
Acknowledgements The supported by National Natural Science Foundation of China (No.
41265011), Educational Commission of Jiangxi Province of China (No.GJJ14548) and
Environment and Conservation Fund of the Hong Kong Special Administrative Region (No.
7/2009). The support of the IRENI program of the Région Nord-Pas de Calaisn, is
acknowledged.
References
[1] W. Chen, R. Maamary, X. Cui, T. Wu, E. Fertein, D. Dewaele, F. Cazier, Q. Zha, Z.
Xu, T. Wang, Y. Wang, W. Zhang, X. Gao, W. Liu, F. Dong, “Photonic Sensing of
Environmental Gaseous Nitrous Acid (HONO): Opportunities and Challenges” in The
Wonder of Nanotechnology: Quantum Optoelectronic Devices and Applications, M.
Razeghi. L. Esaki, and K. von Klitzing, Eds., SPIE Press, Bellingham, WA, 2013, pp.
693-737
[2] T. Wu, Q. Zha, W. Chen, Z. XU, T. Wang, X. He, “Development and deployment of a
cavity enhanced UV-LED spectrometer for measurements of atmospheric HONO and NO2 in
Hong Kong”, Atmos. Environ. 95 (2014) 544-551 |
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