Development of an incoherent broadband cavity-enhanced absorption spectrometer for in situ measurements of HONO and NO2

Duan, Jun and Qin, Min and Ouyang, Bin and Fang, Wu and Li, Xin and Lu, Keding and Tang, Ke and Liang, Shuaixi and Meng, Fanhao and Hu, Zhaokun and Xie, Pinhua and Liu, Wenqing and Häsler, Rolf (2018) Development of an incoherent broadband cavity-enhanced absorption spectrometer for in situ measurements of HONO and NO2. Atmospheric Measurement Techniques, 11 (7). pp. 4531-4543. ISSN 1867-1381

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Abstract

Gaseous nitrous acid (HONO) is an important source of OH radicals in the troposphere. However, its source, especially that during daytime hours remains unclear. We present an 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 been developed with 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 2.0% via a HONO standard generator. Measurement precisions (2 σ) for HONO and NO2 are about 180 and 340ppt in 30s, 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 Fisher 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 tested 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.

Item Type:
Journal Article
Journal or Publication Title:
Atmospheric Measurement Techniques
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1902
Subjects:
ID Code:
135579
Deposited By:
Deposited On:
06 Aug 2019 13:15
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Sep 2020 05:42