Formation of secondary inorganic aerosol in a frigid urban atmosphere

Cheng, Yuan; Yu, Qinqin; Liu, Jiumeng; Sun, Youwen; Liang, Liu; Du, Zhenyu; Geng, Guannan; Ma, Wan–Li; Qi, Hong; Zhang, Qiang; He, Kebin

doi:10.1007/s11783-021-1452-0

Cited by 11 publications

(2 citation statements)

References 33 publications

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“…The concentration of O 3 was positively correlated with temperature but presented a negative association with that of NO 2 . The nitrate concentration can be estimated by NO 2 concentration and the nitrogen oxidation ratio (NOR) with positive temperature dependence (Cheng et al., 2021; Ma et al., 2021). The PM 10 concentration was positively correlated with NO 2 concentration.…”

Section: Methodsmentioning

confidence: 99%

Key Factors Determining the Formation of Sulfate Aerosols Through Multiphase Chemistry—A Kinetic Modeling Study Based on Beijing Conditions

Wang,

Liu,

Zhou

et al. 2023

JGR Atmospheres

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Severe haze in Beijing is characterized by the rapid formation of sulfate via the multiphase oxidation of SO2. While many factors, including aerosol oxidants and atmospheric variables, were discovered and investigated, their relative importance remains unclear. Herein, based on the field observation data obtained in Beijing, China, we developed a kinetic model to explore the key factors that determine the multiphase formation of sulfate. Sensitivity tests give the kinetics of each oxidation pathway varying with pH and temperature, based on which the total sulfate formation rate at room temperature (298 K) is calculated to be generally greater than that at standard temperature (273 K), especially during nighttime. Interfacial oxidants are responsible for sulfate formation within a wide pH range, and transition metal ions become more efficient with increased temperature. The multiphase chemistry is additionally affected by aerosol liquid water content (ALWC), particle radius (Rp), and ionic strength (IS). Within the usual aerosol acidity, the kinetic discrepancy induced by different ALWC levels is more significant at the lower temperature, in contrast to the temperature dependence related to Rp, and the effect of IS depends highly on pH. Machine learning reveals the potential importance of temperature, acidity, and Rp. Temperature and acidity are impactful for the formation of both aqueous and interfacial sulfates, whereas Rp only affects the interfacial processes. The discrepancy between nighttime and daytime is considered throughout this study. Overall, this study reveals the key factors for multiphase sulfate formation and is recommended for kinetic evaluation in future laboratory research.

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Section: Methodsmentioning

confidence: 99%

Key Factors Determining the Formation of Sulfate Aerosols Through Multiphase Chemistry—A Kinetic Modeling Study Based on Beijing Conditions

Wang,

Liu,

Zhou

et al. 2023

JGR Atmospheres

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“…In recent years, the proportion of nitrate aerosols in atmospheric particulates has shown an upward trend. Several studies have shown that the relative content of sulfate decreased by about 10 %-50 %, and the relative content of nitrate increased by about 7 %-25 % in the aerosol particles in the North China Plain and the Sichuan Basin (China) from 2006 to 2017 (Spindler et al, 2013;Xu et al, 2019;Wang et al, 2020;Cheng et al, 2022), which suggests that nitrate plays an increasingly important role in the process of air pollution. The photolysis of HNO 3 /nitrate is indispensable in the process of air pollution and will initiate a series of reactions in the particulate phase (such as nitration for browning atmospheric aerosol).…”

Section: Hno3mentioning

confidence: 99%

Homogeneous and heterogeneous photolysis of nitrate in the atmosphere: state of the science, current research needs, and future prospects

Cao

Chu

et al. 2022

Front. Environ. Sci. Eng.

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Nitrate is an important component of atmospheric particulate matter and affects air quality, climate, human health, and the ecosystem. Nitrate was previously considered a permanent sink for nitrogen oxides (NOx). However, this viewpoint has been challenged in recent years because growing research evidence has shown the transformation of nitrate into NOx (i.e., renoxification). The photolysis of nitrate/HNO3, especially in the particulate phase or adsorbed on particles, can be a significant renoxification process in the atmosphere. The formation and photolysis of nitrate in aerosol not only change the diurnal variation of NOx, but also provide long-distance transport of NOx in the form of nitrate, which affects local and regional atmospheric chemistry and air quality. This review summarizes recent advances in the fundamental understanding of the photolysis of nitrate/HNO3 under various atmospheric conditions, with a focus on mechanisms and key factors affecting the process. The atmospheric implications are discussed and future research is recommended.

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Agricultural Fires in Northeast China: Characteristics, Impacts, and Challenges

Liu

Cheng

2023

Vegetation Fires and Pollution in Asia

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Formation of secondary inorganic aerosol in a frigid urban atmosphere

Cited by 11 publications

References 33 publications

Key Factors Determining the Formation of Sulfate Aerosols Through Multiphase Chemistry—A Kinetic Modeling Study Based on Beijing Conditions

Key Factors Determining the Formation of Sulfate Aerosols Through Multiphase Chemistry—A Kinetic Modeling Study Based on Beijing Conditions

Homogeneous and heterogeneous photolysis of nitrate in the atmosphere: state of the science, current research needs, and future prospects

Agricultural Fires in Northeast China: Characteristics, Impacts, and Challenges

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