Simultaneous HTDMA and HR-ToF-AMS measurements at the HKUST supersite in Hong Kong in 2011

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)9864-9883
Journal / PublicationJournal of Geophysical Research
Volume119
Issue number16
Online published1 Aug 2014
Publication statusPublished - 27 Aug 2014

Abstract

This paper presents the results of simultaneous aerosol hygroscopicity and composition measurements using a Humidified Tandem Differential Mobility Analyzer (HTDMA) and an Aerodyne High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) at the HKUST Supersite, located at a coastal suburban site in Hong Kong. Growth factors (GFs) at 90% relative humidity and the size-resolved composition of ambient aerosols at dry electricalmobility diameters of 75, 100, 150, and 200 nmwere measured in May, September, and November 2011. Bimodal GF distributions with a dominant more hygroscopic (MH) mode and a small fraction of the nonhygroscopic or less hygroscopic mode (number fraction org) of 1.18 are within 10%closure. Approximations for GForg using the fraction of m/z 44 in organic mass spectra, the oxygen-to-carbon atomic ratio, and PMF-resolved organic factors from HR-ToF-AMSmeasurements did not yield better closure results, likely because of the overall dominance of sulfate over the whole study period. Finally, GForg of 1 to 1.5 (with κorg up to 0.29) was found to best fit the additional water content unexplained by the inorganic species.

Citation Format(s)

Simultaneous HTDMA and HR-ToF-AMS measurements at the HKUST supersite in Hong Kong in 2011. / Yeung, Ming Chee; Lee, Berto P.; Li, Yong Jie; CHAN, Chak K.

In: Journal of Geophysical Research, Vol. 119, No. 16, 27.08.2014, p. 9864-9883.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review