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Heterogeneous Uptake of N2O5 in Sand Dust and Urban Aerosols Observed during the Dry Season in Beijing

1
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
2
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3
Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China
4
Environment Research Institute, Shandong University, Ji’nan 250100, China
*
Author to whom correspondence should be addressed.
Now at Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3110, USA.
Now at Shenhua Group Zhungeer Energy Co., Ltd, Eerduosi 010300, China.
Atmosphere 2019, 10(4), 204; https://doi.org/10.3390/atmos10040204
Received: 22 March 2019 / Revised: 13 April 2019 / Accepted: 15 April 2019 / Published: 18 April 2019
(This article belongs to the Special Issue Air Quality in the Asia-Pacific Region)
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Abstract

The uptake of dinitrogen pentoxide (N2O5) on aerosols affects the nocturnal removal of NOx and particulate nitrate formation in the atmosphere. This study investigates N2O5 uptake processes using field observations from an urban site in Beijing during April–May 2017, a period characterized by dry weather conditions. For the first time, a very large N2O5 uptake rate (k(N2O5) up to ~0.01 s−1) was observed during a sand storm event, and the uptake coefficient (γ(N2O5)) was estimated to be 0.044. The γ(N2O5) in urban air masses was also determined and exhibited moderate correlation (r = 0.68) with aerosol volume to surface ratio (Va/Sa), but little relation to aerosol water, nitrate, and chloride, a finding that contrasts with previous results. Several commonly used parameterizations of γ(N2O5) underestimated the field-derived γ(N2O5). A new parameterization is suggested for dry conditions, which considers the effect of Va/Sa, temperature, and relative humidity. View Full-Text
Keywords: N2O5 uptake; sand dust; particle size; aerosol compositions N2O5 uptake; sand dust; particle size; aerosol compositions
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Xia, M.; Wang, W.; Wang, Z.; Gao, J.; Li, H.; Liang, Y.; Yu, C.; Zhang, Y.; Wang, P.; Zhang, Y.; Bi, F.; Cheng, X.; Wang, T. Heterogeneous Uptake of N2O5 in Sand Dust and Urban Aerosols Observed during the Dry Season in Beijing. Atmosphere 2019, 10, 204.

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