气溶胶
亚硝酸
离子强度
水解
化学
稀释
离子键合
水溶液
空气质量指数
二氧化氮
无机化学
热力学
离子
气象学
物理化学
有机化学
物理
作者
Masao Gen,Haotian Zheng,Manish Shrivastava,Wanyun Xu,Nan Ma,Hang Su,Yafang Cheng,Yafei Wang,Jia Xing,Shuping Zhang,Likun Xue,Chaoyang Xue,Yujing Mu,Xuefeng Tian,Atsushi Matsuki,Shaojie Song
出处
期刊:Research Square - Research Square
日期:2022-12-06
标识
DOI:10.21203/rs.3.rs-2257102/v1
摘要
Abstract Nitrogen dioxide (NO 2 ) hydrolysis in deliquesced aerosol particles forms nitrous acid and nitrate and thus impacts air quality, climate, and nitrogen cycle. Traditionally, it is considered to proceed far too slowly in the atmosphere. However, the significance of this process is highly uncertain because kinetic studies have only been made in dilute aqueous solutions, and not under high ionic strength conditions of the aerosol particles. Here, we use laboratory experiments, air quality models, and field measurements to examine the effect of ionic strength on the reaction kinetics of NO 2 hydrolysis. We find that high ionic strengths ( I ) enhance the reaction rate constants ( k I ) by more than two orders of magnitude compared to that at infinite dilution ( k I=0 ), yielding log 10 ( k I / k I =0 ) = 0.058 I . A state-of-the-art air quality model shows that the enhanced NO 2 hydrolysis reduces the negative bias in the simulated concentrations of nitrous acid by 27% on average when compared to field observations over the North China Plain. Rapid NO 2 hydrolysis also enhances the levels of nitrous acid in other polluted regions such as North India and further promotes atmospheric oxidation capacity. This study highlights the need to evaluate various reaction kinetics of atmospheric aerosols with high ionic strengths.
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