Comparison of Aerosol Hygroscopcity, Volatility, and Chemical Composition between a Suburban Site in the Pearl River Delta Region and a Marine Site in Okinawa

Cai, Mingfu; Tan, Haobo; Chan, Chak K.; Mochida, Michihiro; Hatakeyama, Shiro; Kondo, Yutaka; Schurman, M. I.; Xu, Hanbing; Li, Fēi; Shimada, Kojiro; Li, Liu; Deng, Yange; Yai, Hikari; Matsuki, Atsushi; Qin, Yi Ming; Zhao, Jun

doi:10.4209/aaqr.2017.01.0020

Cited by 36 publications

(39 citation statements)

References 41 publications

(39 reference statements)

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“…The HGFs observed in Budapest are also in line with the results reported for other urban areas (Cocker et al, 2001;Baltensperger et al, 2002;Ferron et al, 2005;Massling et al, 2005;Swietlicki et al, 2008, and references therein;Laborde et al, 2013;Lance et al, 2013;Ye et al, 2013;Cai et al, 2017). Our data are slightly above the typical HGF NH and slightly below the typical HGF LH values (for a summary list see Swietlicki et al, 2008, Table 3).…”

Section: Averages Of Hygroscopic and Volatile Propertiessupporting

confidence: 91%

“…The technique has been successfully applied in remote, marine, rural or semi-urban atmospheric environments worldwide, and the results and conclusions were summarised in a review paper by Swietlicki et al (2008). Measurements on complex ambient mixtures explicitly in urban centres have also been increasing (Cocker et al, 2001;Baltensperger et al, 2002;Ferron et al, 2005;Massling et al, 2005;Kuwata and Kondo, 2008;Tiitta et al, 2010;Jurányi et al, 2013;Kamilli et al, 2014;Wu et al, 2016;Cheung et al, 2016;Cai et al, 2017). It turned out from the studies that the hygroscopic and volatile properties vary strongly with the location and the origin of air masses, and in addition the urban-type air pollution can strongly influence these properties.…”

Section: Introductionmentioning

confidence: 99%

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Salma¹

2018

Preprint

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Hygroscopic and volatile properties of atmospheric aerosol particles with dry diameters of (20), 50, 75, 110 and 145 nm were determined in situ by using a volatilityhygroscopicity tandem differential mobility analyser (VH-TDMA) system with a relative humidity of 90 % and denuding temperature of 270 • C in central Budapest during 2 months in winter 2014-2015. The probability density function of the hygroscopic growth factor (HGF) showed a distinct bimodal distribution. One of the modes was characterised by an overall mean HGF of approximately 1.07 (this corresponds to a hygroscopicity parameter κ of 0.033) independently of the particle size and was assigned to nearly hydrophobic (NH) particles. Its mean particle number fraction was large, and it decreased monotonically from 69 to 41 % with particle diameter. The other mode showed a mean HGF increasing slightly from 1.31 to 1.38 (κ values from 0.186 to 0.196) with particle diameter, and it was attributed to less hygroscopic (LH) particles. The mode with more hygroscopic particles was not identified. The probability density function of the volatility GF (VGF) also exhibited a distinct bimodal distribution with an overall mean VGF of approximately 0.96 independently of the particle size, and with another mean VGF increasing from 0.49 to 0.55 with particle diameter. The two modes were associated with less volatile (LV) and volatile (V) particles. The mean particle number fraction for the LV mode decreased from 34 to 21 % with particle diameter. The bimodal distributions indicated that the urban atmospheric aerosol contained an external mixture of particles with a diverse chemical composition. Particles corresponding to the NH and LV modes were assigned mainly to freshly emitted combustion particles, more specifically to vehicle emissions consisting of large mass fractions of soot likely coated with or containing some water-insoluble organic compounds such as non-hygroscopic hydrocarbon-like organics. The hygroscopic particles were ordinarily volatile. They could be composed of moderately transformed aged combustion particles consisting of partly oxygenated organics, inorganic salts and soot. The larger particles contained internally mixed non-volatile chemical species as a refractory residual in 20-25 % of the aerosol material (by volume).

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Section: Averages Of Hygroscopic and Volatile Propertiessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Response to Referee 3

Salma¹

2018

Preprint

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“…The Panyu station is located at the center of the PRD region and at the top of the Dazhengang mountain (23 • 00 N, 113 • 21 E) with an altitude of about 150 m. No significant local emission sources were around the site. Detailed description of the measurement site and instruments (i.e., the HTDMA and the AMS) can be found elsewhere (Cai et al, 2017;Qin et al, 2017).…”

Section: Measurement Sitementioning

confidence: 99%

“…Note that the mass concentrations were too low for particle diameters smaller than 65 nm and data for those particles were hence discarded in this study. A more detailed description of the AMS performance during the measurements can be found in Qin et al (2017) and Cai et al (2017).…”

Section: Aerosol Chemical Composition Measurementsmentioning

confidence: 99%

“…Jiang et al (2016) compared the κ values between wintertime (0.18-0.22) and summertime (0.17-0.21) in Guangzhou. Cai et al (2017) reported the κ values of about 0.4-0.6 and 0.2-0.3 measured by the HTDMA, respectively, in Cape Hedo (Japan) and Guangzhou (China). Alternatively, the average κ values can be predicted by the Zdanovskii-Stokes-Robinson (ZSR) mixing rule (Zdanovskii, 1948;Stokes and Robinson, 1966) which is based on the chemical composition of the aerosol particles from the AMS measurements.…”

Section: Introductionmentioning

confidence: 99%

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The size-resolved cloud condensation nuclei (CCN) activity and its prediction based on aerosol hygroscopicity and composition in the Pearl Delta River (PRD) region during wintertime 2014

Cai

Tan²,

Chan

et al. 2018

Atmos. Chem. Phys.

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Abstract. A hygroscopic tandem differential mobility analyzer (HTDMA), a scanning mobility cloud condensation nuclei (CCN) analyzer (SMCA), and an Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) were used to, respectively, measure the hygroscopicity, condensation nuclei activation, and chemical composition of aerosol particles at the Panyu site in the Pearl River Delta region during wintertime 2014. The distribution of the size-resolved CCN at four supersaturations (SSs of 0.1 %, 0.2 %, 0.4 %, and 0.7 %) and the aerosol particle size distribution were obtained by the SMCA. The hygroscopicity parameter κ (κCCN, κHTDMA, and κAMS) was, respectively, calculated based upon the SMCA, HTDMA, and AMS measurements. The results showed that the κHTDMA value was slightly smaller than the κCCN one at all diameters and for particles larger than 100 nm, and the κAMS value was significantly smaller than the others (κCCN and κHTDMA), which could be attributed to the underestimated hygroscopicity of the organics (κorg). The activation ratio (AR) calculated from the growth factor – probability density function (Gf-PDF) without surface tension correction was found to be lower than that from the CCN measurements, due most likely to the uncorrected surface tension (σs∕a) that did not consider the surfactant effects of the organic compounds. We demonstrated that better agreement between the calculated and measured ARs could be obtained by adjusting σs∕a. Various schemes were proposed to predict the CCN number concentration (NCCN) based on the HTDMA and AMS measurements. In general, the predicted NCCN agreed reasonably well with the corresponding measured ones using different schemes. For the HTDMA measurements, the NCCN value predicted from the real-time AR measurements was slightly smaller (∼6.8 %) than that from the activation diameter (D50) method due to the assumed internal mixing in the D50 prediction. The NCCN values predicted from bulk chemical composition of PM1 were higher (∼11.5 %) than those from size-resolved composition measured by the AMS because a significant fraction of PM1 was composed of inorganic matter. The NCCN values calculated from AMS measurement were underpredicted at 0.1 % and 0.2 % supersaturations, which could be due to underestimation of κorg and overestimation of σs∕a. For SS values of 0.4 % and 0.7 %, slight overpredicted NCCN values were found because of the internal mixing assumption. Our results highlight the need for accurately evaluating the effects of organics on both the hygroscopic parameter κ and the surface tension σ in order to accurately predict CCN activity.

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A closure study of aerosol optical properties as a function of RH using a κ-AMS-BC-Mie model in Beijing, China

Zou

Yang

et al. 2019

Atmospheric Environment

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Comparison of Aerosol Hygroscopcity, Volatility, and Chemical Composition between a Suburban Site in the Pearl River Delta Region and a Marine Site in Okinawa

Cited by 36 publications

References 41 publications

Response to Referee 3

Response to Referee 3

The size-resolved cloud condensation nuclei (CCN) activity and its prediction based on aerosol hygroscopicity and composition in the Pearl Delta River (PRD) region during wintertime 2014

A closure study of aerosol optical properties as a function of RH using a κ-AMS-BC-Mie model in Beijing, China

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