Submicrometer Particles Are in the Liquid State during Heavy Haze Episodes in the Urban Atmosphere of Beijing, China,Environmental Science & Technology Letters

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Submicrometer Particles Are in the Liquid State during Heavy Haze Episodes in the Urban Atmosphere of Beijing, China
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.estlett.7b00352
Yuechen Liu ₁ , Zhijun Wu ₁ , Yu Wang ₁ , Yao Xiao ₁ , Fangting Gu ₁ , Jing Zheng ₁ , Tianyi Tan ₁ , Dongjie Shang ₁ , Yusheng Wu ₁ , Limin Zeng ₁ , Min Hu ₁ , Adam P. Bateman ₂ , Scot T. Martin _{2,

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Affiliation

The particle phase state is a key factor for determining gas particle partitioning, particle reactive gas uptake, and multiphase chemical reactions, with associated links to secondary aerosol formation. In this study, the particle phase state was investigated by measuring particle rebound fraction f in the highly polluted atmosphere of Beijing, China. The particle phase state was sensitive to ambient relative humidity (RH). The particles changed from rebounding to adhering when the RH increased above 60%, suggesting a transition from the semisolid to liquid state. This transition RH was below the deliquescence RH of both (NH₄)₂SO₄ and NH₄NO₃. Submicrometer particles were in the liquid state during heavy haze episodes. This might be because the elevated RH and inorganic fraction in particles resulted in an increase in aerosol liquid water content. The transition to a liquid phase state, marking the beginning of the haze episode, might kick off a positive feedback loop. The liquid particles might readily take up pollutants that then react to form inorganics, thereby further increasing the rate of water uptake. We propose that the liquid phase state facilitates the mass transfer and multiphase reactions of the particles, thereby accelerating secondary particle growth in haze over the North China Plain.

更新日期：2017-09-21

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