气候变化领域集成服务门户(CCPortal): Hygroscopicity of Water-Soluble PM2.5 in Rural Northwest China: Contrasting Contributors Between Summer and Winter

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DOI	10.1029/2021JD034977
	Hygroscopicity of Water-Soluble PM2.5 in Rural Northwest China: Contrasting Contributors Between Summer and Winter
	Chen Y.; Wang X.; Peng H.; Li J.; Wang Y.; Wang G.; Li J.; Wu C.; Liu L.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:15
英文摘要	In this study, we investigated the chemical composition and hygroscopicity of water-soluble fraction in PM2.5 collected from a rural site of Guanzhong Basin, a highly polluted region in northwest China. We found that inorganic components are the main substances promoting the hygroscopic properties of particulate matter (PH) in summer, while in winter, an increasing contribution from water-soluble organic matters (WSOM) was observed. The sulfate-nitrate-ammonium concentration is higher on heavily polluted days, and a high concentration of water-soluble organic matter was observed in non-polluting days. Hygroscopic growth factors, g(RH), with elevated relative humidity (RH) of water-soluble matter (WSM) were measured for 50, 75, 100, 125, 150 nm by hygroscopic tandem differential mobility analyzer. An initial dry particle diameter of 100 nm was chosen as the research object because the particle size has little effect on the hygroscopic growth factor at RH = 90%. The g(90%)WSM and κWSM was in the range of 1.19–1.49 and 0.06–0.22 in summer, 1.24–1.49 and 0.08–0.22 in winter, respectively, which is similar to the hygroscopicity parameters of PH produced by biomass burning. The g(90%)WSOM and κWSOM, obtained using E-AIM model and Zdanovskii-Stokes-Robinson approach, were in the range of 1.06–1.69 and 0.02–0.36 in summer, 1.06–1.58 and 0.02–0.28 in winter, respectively. The hygroscopicity parameters of water-soluble organic matter is close to the value of levoglucosan, an indicator of biomass burning, implying this region is highly affected by biomass burning. Overall, our results revealed that PM2.5 in rural regions of Guanzhong Basin is mainly influenced by biomass burning. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	chemical composition; Guanzhong Basin; hygroscopicity; PM2.5; water-soluble matter
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237078
作者单位	State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China; State Key Laboratory of Loess and Quaternary Geology, Key Lab of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, China; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, China
推荐引用方式 GB/T 7714	Chen Y.,Wang X.,Peng H.,et al. Hygroscopicity of Water-Soluble PM2.5 in Rural Northwest China: Contrasting Contributors Between Summer and Winter[J],2021,126(15).
APA	Chen Y..,Wang X..,Peng H..,Li J..,Wang Y..,...&Liu L..(2021).Hygroscopicity of Water-Soluble PM2.5 in Rural Northwest China: Contrasting Contributors Between Summer and Winter.Journal of Geophysical Research: Atmospheres,126(15).
MLA	Chen Y.,et al."Hygroscopicity of Water-Soluble PM2.5 in Rural Northwest China: Contrasting Contributors Between Summer and Winter".Journal of Geophysical Research: Atmospheres 126.15(2021).