Dust emission reduction enhanced gas-to-particle conversion of ammonia in the North China Plain

Yongchun Liu (), Junlei Zhan, Feixue Zheng, Boying Song, Yusheng Zhang, Wei Ma, Chenjie Hua, Jiali Xie, Xiaolei Bao (), Chao Yan, Federico Bianchi, Tuukka Petäjä, Aijun Ding, Yu Song, Hong He and Markku Kulmala
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Yongchun Liu: Beijing University of Chemical Technology
Junlei Zhan: Beijing University of Chemical Technology
Feixue Zheng: Beijing University of Chemical Technology
Boying Song: Beijing University of Chemical Technology
Yusheng Zhang: Beijing University of Chemical Technology
Wei Ma: Beijing University of Chemical Technology
Chenjie Hua: Beijing University of Chemical Technology
Jiali Xie: Beijing University of Chemical Technology
Xiaolei Bao: Hebei Chemical & Pharmaceutical College
Chao Yan: University of Helsinki
Federico Bianchi: University of Helsinki
Tuukka Petäjä: Beijing University of Chemical Technology
Aijun Ding: Nanjing University
Yu Song: Peking University
Hong He: Chinese Academy of Sciences
Markku Kulmala: Beijing University of Chemical Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Ammonium salt is an important component of particulate matter with aerodynamic diameter less than 2.5 µm (PM2.5) and has significant impacts on air quality, climate, and natural ecosystems. However, a fundamental understanding of the conversion kinetics from ammonia to ammonium in unique environments of high aerosol loading is lacking. Here, we report the uptake coefficient of ammonia (γNH3) on ambient PM2.5 varying from 2.2 × 10−4 to 6.0 × 10−4 in the North China Plain. It is significantly lower than those on the model particles under simple conditions reported in the literature. The probability-weighted γNH3 increases obviously, which is well explained by the annual decrease in aerosol pH due to the significant decline in alkali and alkali earth metal contents from the emission source of dust. Our results elaborate on the complex interactions between primary emissions and the secondary formation of aerosols and the important role of dust in atmospheric chemistry.

Date: 2022
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DOI: 10.1038/s41467-022-34733-4

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