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- Title
Fast heterogeneous N<sub>2</sub>O<sub>5</sub> uptake and ClNO<sub>2</sub> production in power plant plumes observed in the nocturnal residual layer over the North China Plain.
- Authors
Zhe Wang; Weihao Wang; Yee Jun Tham; Qinyi Li; Hao Wang; Liang Wen; Xinfeng Wang; Tao Wang
- Abstract
Dinitrogen pentoxide (N2O5) and nitryl chloride (ClNO2) are key species in nocturnal tropospheric chemistry, and have significant effects on particulate nitrate formation and the following day's photochemistry. To better understand the roles of N2O5 and ClNO2 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 ClNO2 plumes were frequently observed in the nocturnal residual layer with a maximum mixing ratio of 2.1 ppbv (1-min), whilst N2O5 was typically present at very low levels (<30 pptv), indicating fast heterogeneous N2O5 hydrolysis. Combined analyses of chemical characteristics and backward trajectories indicated that the ClNO2-laden air was caused by the transport of NOx-rich plumes from the coal-fired power plants in the NCP. The heterogeneous N2O5 uptake coefficient (γ) and ClNO2 yield during the campaign exhibited high variability, with means of 0.061 ± 0.025 and 0.27 ± 0.24, respectively. These derived 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 N2O5 reactions dominated the nocturnal NOx loss in the residual layer over this region, and contributed to substantial nitrate formation of up to 17 μg m-3. The determined nocturnal nitrate formation rates ranged from 0.2 to 4.8 μg m-3 hr-1 in various plumes, with a mean of 2.2 ± 1.4 μg m-3 h-1. The results demonstrate the significance of heterogeneous N2O5 reactivity and chlorine activation in the NCP, and their unique and universal roles in fine aerosol formation and NOx transformation, and thus potential impacts on regional haze pollution in northern China.
- Subjects
NOCTURNAL emissions; PLUMES (Fluid dynamics); POWER plants; PHOTOCHEMISTRY; NITRATES
- Publication
Atmospheric Chemistry & Physics Discussions, 2017, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2017-492