Effects of hygroscopicity on aerosol optical properties and direct radiative forcing in Beijing: Based on two-year observations

单次散射反照率 气溶胶 辐射压力 埃指数 大气科学 辐射传输 反照率(炼金术) 散射 相对湿度 环境科学 矿物粉尘 化学 气象学 物理 光学 艺术 表演艺术 艺术史
作者
Can Xia,Junying Sun,Xinyao Hu,Xiaojing Shen,Yangmei Zhang,Sinan Zhang,Jialing Wang,Quan Liu,Jiayuan Lu,Shuo Liu,Xiaoye Zhang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:857: 159233-159233 被引量:2
标识
DOI:10.1016/j.scitotenv.2022.159233
摘要

The influence of relative humidity on aerosol properties and the direct radiative forcing of PM10 and PM1 were investigated in Beijing from January 2018 to December 2019. The annual mean scattering hygroscopic growth factor at RH = 80 % [f(80 %)] of PM10 and PM1 were 1.60 ± 0.24 and 1.58 ± 0.22, respectively. The variation of aerosol hygroscopic growth factors of PM10 and PM1 aerosols was similar, which is mainly due to the fact that aerosol scattering in Beijing is dominated by fine particles. The seasonal mean f(80 %) of PM10 from spring to winter were 1.66 ± 0.23, 1.71 ± 0.25, 1.51 ± 0.20, 1.49 ± 0.16, respectively, which were higher in spring and summer, and lower in autumn and winter. The diurnal variation of f(80 %) was relatively higher from 12:00 to 18:00, which could be related to the formation of secondary aerosols by photochemical reactions. f(80 %) shows a strong positive relationship with both the scattering Angström exponent (SAE) and the single scattering albedo (ω0) under dry conditions; therefore, the scattering hygroscopic growth factor could be estimated using these two parameters. The upscatter fraction (β) and single scattering albedo, which are the key aerosol optical properties for the calculation of direct radiative forcing, are also RH-dependent. As RH increases, the upscatter fraction (backscatter fraction) decreases and ω0 increases. The aerosol radiative forcing at RH 80 % was 1.48 times as that in the dry state. The sensitivity experiment showed that the variation in the scattering coefficient with relative humidity had the greatest influence on radiation forcing, followed by β and ω0. The seasonal variation of ΔF(80 %)/ΔF(dry) coincides with that of the aerosol hygroscopic growth factor. Our study suggests that understanding the influence of relative humidity on aerosol properties and direct radiative forcing is important for accurately estimating the radiative forcing of aerosols.
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