2024-03-29T11:59:11Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02019360
2023-08-03T05:37:43Z
1642838163960:1642838338003
1642838403551:1642838406414
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, K. Chak
Mochida, Michihiro
Hatakeyama, Shiro
Kondo, Yutaka
Schurman, I. Misha
Xu, Hanbing
Li, Fei
Shimada, Kojiro
Li, Liu
Deng, Yange
Yai, Hikari
Matsuki, Atsushi
Qin, Yiming
Zhao, Jun
Hygroscopicity
Chemical composition
Volatility
Pearl River Delta
A suite of advanced instruments were employed to measure aerosol hygroscopicity, volatility and chemical composition at a suburban site in the Pearl River Delta (PRD) Region and at a marine site in Okinawa, respectively. The results showed that the particle number concentration in PRD is approximately ten times higher than that in Okinawa. Organics contributes about one half of the total NR-PM_1 concentration in PRD, while sulfate is the dominant component (about 60%) in Okinawa. Diurnal variation of the chemical species demonstrated that the site in PRD was affected by trafficrelated sources and industrial emissions, while the one in Okinawa is mainly affected by regional emissions. The V-TDMA measurements showed that a large fraction (20-45%) of particles in Okinawa volatilized at about 200°C and nearly all particles volatilized at about 300°C, indicating that the particles were almost volatile in Okinawa. In contrast, a fraction (15-21%) of particles in PRD did not evaporate even when heated to about 300°C, implying that these particles might contain black carbon or low-volatile organics. For 40-200 nm particles in Okinawa, the hygroscopicity parameter κ is around 0.5, significantly higher than that of PRD particles (κ ≈ 0.26). Particles tend to have bimodal distribution in PRD and unimodal in Okinawa, indicating that the former is externally mixed while the latter is internally mixed.
http://purl.org/coar/resource_type/c_6501
Taiwan Association for Aerosol Research
2017-12
VoR
1680-8584
2071-1409
Aerosol and Air Quality Research
12
17
3208
3194
eng
https://doi.org/10.4209/aaqr.2017.01.0020
open access
© Taiwan Association for Aerosol Research
the Creative Commons Attribution 4.0 License (CC BY 4.0)