Hygroscopicity of Different Types of Aerosol Particles: Case Studies Using Multi-Instrument Data in Megacity Beijing, China

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dc.contributor.authorWu, Tong
dc.contributor.authorLi, Zhanqing
dc.contributor.authorChen, Jun
dc.contributor.authorWang, Yuying
dc.contributor.authorWu, Hao
dc.contributor.authorJin, Xiao'ai
dc.contributor.authorLiang, Chen
dc.contributor.authorLi, Shangze
dc.contributor.authorWang, Wei
dc.contributor.authorCribb, Maureen
dc.date.accessioned2023-11-09T20:28:44Z
dc.date.available2023-11-09T20:28:44Z
dc.date.issued2020-03-01
dc.description.abstractWater uptake by aerosol particles alters its light-scattering characteristics significantly. However, the hygroscopicities of different aerosol particles are not the same due to their different chemical and physical properties. Such differences are explored by making use of extensive measurements concerning aerosol optical and microphysical properties made during a field experiment from December 2018 to March 2019 in Beijing. The aerosol hygroscopic growth was captured by the aerosol optical characteristics obtained from micropulse lidar, aerosol chemical composition, and aerosol particle size distribution information from ground monitoring, together with conventional meteorological measurements. Aerosol hygroscopicity behaves rather distinctly for mineral dust coarse-mode aerosol (Case I) and non-dust fine-mode aerosol (Case II) in terms of the hygroscopic enhancement factor, đ‘“đ›œ(đ‘…đ»,𝜆532), calculated for the same humidity range. The two types of aerosols were identified by applying the polarization lidar photometer networking method (POLIPHON). The hygroscopicity for non-dust aerosol was much higher than that for dust conditions with the đ‘“đ›œ(đ‘…đ»,𝜆532) being around 1.4 and 3.1, respectively, at the relative humidity of 86% for the two cases identified in this study. To study the effect of dust particles on the hygroscopicity of the overall atmospheric aerosol, the two types of aerosols were identified and separated by applying the polarization lidar photometer networking method in Case I. The hygroscopic enhancement factor of separated non-dust fine-mode particles in Case I had been significantly strengthened, getting closer to that of the total aerosol in Case II. These results were verified by the hygroscopicity parameter, Îș (Case I non-dust particles: 0.357 ± 0.024; Case II total: 0.344 ± 0.026), based on the chemical components obtained by an aerosol chemical speciation instrument, both of which showed strong hygroscopicity. It was found that non-dust fine-mode aerosol contributes more during hygroscopic growth and that non-hygroscopic mineral dust aerosol may reduce the total hygroscopicity per unit volume in Beijing.
dc.description.urihttps://doi.org/10.3390/rs12050785
dc.identifierhttps://doi.org/10.13016/dspace/mquy-sxpn
dc.identifier.citationWu, T.; Li, Z.; Chen, J.; Wang, Y.; Wu, H.; Jin, X.; Liang, C.; Li, S.; Wang, W.; Cribb, M. Hygroscopicity of Different Types of Aerosol Particles: Case Studies Using Multi-Instrument Data in Megacity Beijing, China. Remote Sens. 2020, 12, 785.
dc.identifier.urihttp://hdl.handle.net/1903/31353
dc.language.isoen_US
dc.publisherMDPI
dc.relation.isAvailableAtCollege of Computer, Mathematical & Natural Sciencesen_us
dc.relation.isAvailableAtAtmospheric & Oceanic Scienceen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectaerosol hygroscopicity
dc.subjectlidar observation
dc.subjectdust
dc.subjectnon-dust
dc.subjectPOLIPHON
dc.subjectchemical composition
dc.titleHygroscopicity of Different Types of Aerosol Particles: Case Studies Using Multi-Instrument Data in Megacity Beijing, China
dc.typeArticle
local.equitableAccessSubmissionNo

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