Observations of N 2 O 5 and ClNO 2 at a polluted urban surface site in North China: High N 2 O 5 uptake coefficients and low ClNO 2 product yields

Wang, Xinfeng; Wang, Hao; Xue, Likun; Wang, Tao; Wang, Liwei; Gu, Rong; Wang, Weihao; Tham, Yee Jun; Wang, Zhe; Yang, Lingxiao; Chen, Jianmin; Wang, Wenxing

doi:10.1016/j.atmosenv.2017.02.035

Cited by 95 publications

(99 citation statements)

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“…Furthermore, inconsistencies between γ N 2 O 5 values derived from field measurements and parameterizations were observed in some locations, which implies that γ N 2 O 5 has a complex dependence on the aerosol composition, physicochemical characteristics, and environmental parameters (Chang et al, 2011, and references therein). Similarly, for the ClNO 2 yield, the field-determined values exhibited significant variability, ranging from 0.01 to close to unity (Thornton et al, 2010;Riedel et al, 2013;Wagner et al, 2013;Phillips et al, 2016), which could not be well reproduced (exhibiting a 10-fold difference in some cases) by parameterization based on only aerosol chloride and water content X. Wang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Fast heterogeneous N2O5 uptake and ClNO2 production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

et al. 2017

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Abstract. Dinitrogen pentoxide (N 2 O 5 ) and nitryl chloride (ClNO 2 ) are key species in nocturnal tropospheric chemistry and have significant effects on particulate nitrate formation and the following day's photochemistry through chlorine radical production and NO x recycling upon photolysis of ClNO 2 . To better understand the roles of N 2 O 5 and ClNO 2 in the high-aerosol-loading environment of northern China, an intensive field study was carried out at a high-altitude site (Mt. Tai, 1465 m a.s.l.) in the North China Plain (NCP) during the summer of 2014. Elevated ClNO 2 plumes were frequently observed in the nocturnal residual layer with a maximum mixing ratio of 2.1 ppbv (1 min), whilst N 2 O 5 was typically present at very low levels (< 30 pptv), indicating fast heterogeneous N 2 O 5 hydrolysis. Combined analyses of chemical characteristics and backward trajectories indicated that the ClNO 2 -laden air was caused by the transport of NO xrich plumes from the coal-fired industry and power plants in the NCP. The heterogeneous N 2 O 5 uptake coefficient (γ ) and ClNO 2 yield (φ) were estimated from steady-state analysis and observed growth rate of ClNO 2 . The derived γ and φ exhibited high variability, with means of 0.061 ± 0.025 and 0.28 ± 0.24, respectively. These values are higher than those derived from previous laboratory and field studies in other regions and cannot be well characterized by model parameterizations. Fast heterogeneous N 2 O 5 reactions dominated the nocturnal NO x loss in the residual layer over this region and contributed to substantial nitrate formation of up to 17 µg m −3 . The estimated nocturnal nitrate formation rates ranged from 0.2 to 4.8 µg m −3 h −1 in various plumes, with a mean of 2.2 ± 1.4 µg m −3 h −1 . The results demonstrate the significance of heterogeneous N 2 O 5 reactivity and chlorine activation in the NCP, and their unique and universal roles in fine aerosol formation and NO x transformation, and thus their potential impacts on regional haze pollution in northern China.

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Section: Introductionmentioning

confidence: 99%

Fast heterogeneous N2O5 uptake and ClNO2 production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

et al. 2017

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“…The online instruments and methods used for the winter field campaign were described in detail by L. . In the summer campaign, due to logistical issues, water-soluble ions were determined from quartz-filtered samples of PM 2.5 by ion chromatography (Wang et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

Observations of fine particulate nitrated phenols in four sites in northern China: concentrations, source apportionment, and secondary formation

Wang

et al. 2018

Atmos. Chem. Phys.

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Abstract. Filter samples of fine particulate matters were collected at four sites in northern China (urban, rural, and mountain) in summer and winter, and the contents of nine nitrated phenols were quantified in the laboratory with the use of ultra-high-performance liquid chromatography coupled with mass spectrometry. During the sampling periods, the concentrations of particulate nitrated phenols exhibited distinct temporal and spatial variation. On average, the total concentration of particulate nitrated phenols in urban Jinan in the wintertime reached 48.4 ng m −3 , and those in the summertime were 9.8, 5.7, 5.9, and 2.5 ng m −3 in urban Jinan, rural Yucheng and Wangdu, and Mt. Tai, respectively. The elevated concentrations of nitrated phenols in wintertime and in urban areas demonstrate the apparent influences of anthropogenic sources. The positive matrix factorization receptor model was then applied to determine the origins of particulate nitrated phenols in northern China. The five major source factors were traffic, coal combustion, biomass burning, secondary formation, and aged coal combustion plume. Among them, coal combustion played a vital role, especially at the urban site in the wintertime, with a contribution of around 55 %. In the summertime, the observed nitrated phenols were highly influenced by aged coal combustion plumes at all of the sampling sites. Meanwhile, in remote areas, contributions from secondary formation were significant. Further correlation analysis indicates that nitrosalicylic acids were produced mostly from secondary formation that was dominated by NO 2 nitration.

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“…Several recent studies have revealed active N 2 O 5 heterogeneous process on aerosols at polluted sites and its significant impacts on photochemistry and secondary aerosol formation due to abundant NO x , O 3 and aerosols (e.g., Li et al, 2016;Tham et al, 2016;Wang et al, 2016;Wang et al, 2017a;Wang et al, 2017b;Yun et al, 2018). The γN 2 O 5 derived from ambient concentration measurements showed different characteristics and dependence compared to previous measurements in 10 relatively clean environments (Wang et al, 2017b).…”

Section: Introductionmentioning

confidence: 48%

“…The N 2 O 5 and ClNO 2 concentrations 20 were quantified by an iodide-adduct chemical ionization mass spectrometer (CIMS; THS Instrument, Atlanta). The CIMS has been deployed in several field campaigns, and the setup and operation have been previously described Wang et al, 2016;Wang et al, 2017a;Wang et al, 2017b). Briefly, the primary ion I to ambient measurement, a smaller orifice with a 0.0135-in diameter was utilized in the CIMS inlet to reduce the sample flow, and another orifice was added before the scroll pump to keep the pressure in the ionization reaction chamber at 50 torr.…”

Section: Detection Instrumentsmentioning

confidence: 99%

An in-situ flow-tube system for direct measurement of N2O5 heterogeneous uptake coefficients in polluted environments

Wang¹,

Wang²,

Chen³

et al. 2018

Preprint

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Observations of N 2 O 5 and ClNO 2 at a polluted urban surface site in North China: High N 2 O 5 uptake coefficients and low ClNO 2 product yields

Cited by 95 publications

References 64 publications

Fast heterogeneous N<sub>2</sub>O<sub>5</sub> uptake and ClNO<sub>2</sub> production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

Fast heterogeneous N<sub>2</sub>O<sub>5</sub> uptake and ClNO<sub>2</sub> production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

Observations of fine particulate nitrated phenols in four sites in northern China: concentrations, source apportionment, and secondary formation

An in-situ flow-tube system for direct measurement of N<sub>2</sub>O<sub>5</sub> heterogeneous uptake coefficients in polluted environments

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Observations of N 2 O 5 and ClNO 2 at a polluted urban surface site in North China: High N 2 O 5 uptake coefficients and low ClNO 2 product yields

Cited by 95 publications

References 64 publications

Fast heterogeneous N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; uptake and ClNO&lt;sub&gt;2&lt;/sub&gt; production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

Fast heterogeneous N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; uptake and ClNO&lt;sub&gt;2&lt;/sub&gt; production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

Observations of fine particulate nitrated phenols in four sites in northern China: concentrations, source apportionment, and secondary formation

An in-situ flow-tube system for direct measurement of N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; heterogeneous uptake coefficients in polluted environments

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Fast heterogeneous N<sub>2</sub>O<sub>5</sub> uptake and ClNO<sub>2</sub> production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

Fast heterogeneous N<sub>2</sub>O<sub>5</sub> uptake and ClNO<sub>2</sub> production in power plant and industrial plumes observed in the nocturnal residual layer over the North China Plain

An in-situ flow-tube system for direct measurement of N<sub>2</sub>O<sub>5</sub> heterogeneous uptake coefficients in polluted environments