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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-436
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Feb 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Development of an incoherent broadband cavity enhanced absorption spectrometer for in situ measurements of HONO and NO2 in China
Jun Duan1, Min Qin1, Bin Ouyang2, Wu Fang1, Xin Li3, Keding Lu3, Ke Tang1, Shuaixi Liang1, Fanhao Meng1, Zhaokun Hu1, Pinhua Xie1,4,5, and Wenqing Liu1,4,5 1Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China
2Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
3College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
4CAS Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
5School of Environmental Science and Optoeclectronic Technology, University of Science and Technology of China, Hefei, 230027, China
Abstract. Gaseous nitrous acid (HONO) is an important source of OH radical in the troposphere. However, its source, especially that during daytime hours remains unclear. We report hereby a home-built instrument for simultaneous unambiguous measurements of HONO and NO2 with high time resolution based on incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS). To achieve robust performance and system stability under different environment conditions, the current IBBCEAS instrument has made significant improvements in terms of efficient sampling as well as resistance against vibration and temperature change, and the IBBCEAS instrument also has low-power consumption and a compact design that can be easily deployed on different platforms powered by a high-capacity lithium ion battery. The effective cavity length of the IBBCEAS was determined using the absorption of O2-O2 to account for the shortening effect caused by the mirror purge flows. The wall loss for HONO was estimated to be 2 % via a HONO standard generator. Measurement precisions (2σ) for HONO and NO2 are about 180 ppt and 340 ppt in 30 s, respectively. A field inter-comparison was carried out at a rural suburban site in Wangdu, Hebei Province, China. The concentrations of HONO and NO2 measured by IBBCEAS were compared with a long optical path absorption photometer (LOPAP) and a NOx analyzer (Thermo Electron Model 42i), and the results showed very good agreement, with correlation coefficients (R2) of HONO and NO2 being ~ 0.89 and ~ 0.95, respectively, in addition, vehicle deployments were also tried to enable mobile measurements of HONO and NO2, demonstrating the promising potential of using IBBCEAS for in situ, sensitive, accurate and fast simultaneous measurements of HONO and NO2 in the future.
Citation: Duan, J., Qin, M., Ouyang, B., Fang, W., Li, X., Lu, K., Tang, K., Liang, S., Meng, F., Hu, Z., Xie, P., and Liu, W.: Development of an incoherent broadband cavity enhanced absorption spectrometer for in situ measurements of HONO and NO2 in China, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-436, in review, 2018.
Jun Duan et al.
Jun Duan et al.
Jun Duan et al.

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Short summary
We report a home-built instrument for simultaneous unambiguous measurements of HONO and NO2 based on incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS).The current IBBCEAS instrument has made significant improvements in terms of efficient sampling as well as resistance against vibration and temperature change and the measurement precisions (2σ) for HONO are about 180 ppt and 340 ppt in 30 s, respectively. The field inter-comparison and the mobile measurements are present.
We report a home-built instrument for simultaneous unambiguous measurements of HONO and NO2...
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