Chemical closure study on hygroscopic properties of urban aerosol particles in Sapporo, Japan.
Chemical closure study on hygroscopic properties of urban aerosol particles in Sapporo, Japan.
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DOI：
10.1021/es063092m
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发表时间：
2007-09
影响因子：
11.4
通讯作者：
S. G. Aggarwal;M. Mochida;Y. Kitamori;K. Kawamura
中科院分区：
文献类型：
--
作者：
S. G. Aggarwal;M. Mochida;Y. Kitamori;K. Kawamura
To assess the link between hygroscopicity of atmospheric particles and the chemical composition, we performed a chemical closure study on the hygroscopicity of organic-inorganic mixed particles nebulized from water extracts of ambient aerosols collected in Sapporo, Japan during summer 2005. The hygroscopicity of 100 nm particles was measured using a hygroscopicity tandem differential mobility analyzer (HTDMA) at 5-95% relative humidity. The chemical analyses of the extracts showed that inorganic salts accounted for 32-84% of the water-soluble fraction and that the remaining was water-soluble organic matter (WSOM). The liquid water content (LWC) of particles was primarily governed by the relative abundance of inorganic salts in particles. The chemical closure with a thermodynamic model did not indicate a significant perturbation of LWC by WSOM at 85% RH with the consideration of the uncertainties estimated. However, a positive perturbation by WSOM was suggested at 50% RH. Individual oxygenated compounds identified using gas chromatography were not abundant enough to substantially increase the LWC at 85% RH.
