Tandem configuration of differential mobility and centrifugal particle mass analysers for investigating aerosol hygroscopic properties

TitleTandem configuration of differential mobility and centrifugal particle mass analysers for investigating aerosol hygroscopic properties
Publication TypeJournal Article
Year of Publication2017
AuthorsVlasenko S.S, Su H., Poschl U., Andreae M.O, Mikhailov E.F
JournalAtmospheric Measurement Techniques
Volume10
Pagination1269-1280
Date Published2017/03
Type of ArticleArticle
ISBN Number1867-1381
Accession NumberWOS:000398188100004
Keywordsammonium-sulfate; atmospheric aerosols; cloud condensation nuclei; critical supersaturation; growth measurements; light-scattering; model; phase-transitions; relative-humidity; thermodynamic; water-uptake
Abstract

fA tandem arrangement of Differential Mobility Analyser and Humidified Centrifugal Particle Mass Analyser (DMA-HCPMA) was developed to measure the deliquescence and efflorescence thresholds and the water uptake of submicron particles over the relative humidity (RH) range from 10 to 95 %. The hygroscopic growth curves obtained for ammonium sulfate and sodium chloride test aerosols are consistent with thermodynamic model predictions and literature data. The DMA-HCPMA system was applied to measure the hygroscopic properties of urban aerosol particles, and the kappa mass interaction model (KIM) was used to characterize and parameterize the concentration-dependent water uptake observed in the 50-95 % RH range. For DMA-selected 160 nm dry particles (modal mass of 3.5 fg), we obtained a volume-based hygroscopicity parameter, kappa(upsilon) approximate to 0.2, which is consistent with literature data for freshly emitted urban aerosols. Overall, our results show that the DMA-HCPMA system can be used to measure size-resolved mass growth factors of atmospheric aerosol particles upon hydration and dehydration up to 95% RH. Direct measurements of particle mass avoid the typical complications associated with the commonly used mobility-diameter-based HTDMA technique (mainly due to poorly defined or unknown morphology and density).

DOI10.5194/amt-10-1269-2017
Short TitleAtmos. Meas. Tech.
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