气候变化领域集成服务门户(CCPortal): Hygroscopicity of urban aerosols and its link to size-resolved chemical composition during spring and summer in Seoul; Korea

CCPortal

DOI	10.5194/acp-20-11245-2020
	Hygroscopicity of urban aerosols and its link to size-resolved chemical composition during spring and summer in Seoul; Korea
	Kim N.; Yum S.S.; Park M.; Park J.S.; Shin H.J.; Ahn J.Y.
发表日期	2020
ISSN	16807316
起始页码	11245
结束页码	11262
卷号	20 期号:19
英文摘要	Chemical effects on the size-resolved hygroscopicity of urban aerosols were examined based on the Korea-US Air Quality Study (KORUS-AQ, 2020) field campaign data. The information on size-resolved hygroscopicity and the chemical composition of aerosols were obtained by a hygroscopic tandem differential mobility analyzer (HTDMA) and a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS), respectively. Good correspondence was shown between measured and estimated κ values calculated from the combination of bulk chemical composition data and oxidation parameters of organic aerosols (f44 and O=C). These results imply that chemical composition is closely associated with aerosol hygroscopicity. However, the correlation between measured and estimated κ values degraded as particle size decreased, implying that size-resolved chemical composition data are required for more detailed hygroscopicity analysis. In addition to size-resolved chemical data, the m=z tracer method was applied for size-resolved organic factors. Specifically, m=z 57 and 44 were used as AMS spectral markers for hydrocarbon-like organic aerosol (HOA) and oxygenated organic aerosol (OOA), respectively. These size-resolved chemical composition data were found to be critical in explaining size-dependent hygroscopicity, as well as the diurnal variation in κ for small particles, i.e., low κ in the morning and high κ in the afternoon. Additionally, aerosol mixing state information was associated with the size-resolved chemical composition data. That is to say that the relationship between the number fraction of each hygroscopicity mode and the volume fraction of different chemical composition was investigated. For example, the HOA volume fraction comprised about 60 % of the variation in less hygroscopic (LH) mode number fractions for externally mixed aerosols. © 2020 EDP Sciences. All rights reserved.
语种	英语
scopus关键词	aerosol; chemical composition; hygroscopicity; oxidation; particle size; spring (season); summer; urban atmosphere; Seoul [South Korea]; South Korea
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143921
作者单位	Department of Atmosphere Sciences, Yonsei University, Seoul, 03722, South Korea; Air Quality Research Division, National Institute of Environment Research, Incheon, 22689, South Korea; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany
推荐引用方式 GB/T 7714	Kim N.,Yum S.S.,Park M.,et al. Hygroscopicity of urban aerosols and its link to size-resolved chemical composition during spring and summer in Seoul; Korea[J],2020,20(19).
APA	Kim N.,Yum S.S.,Park M.,Park J.S.,Shin H.J.,&Ahn J.Y..(2020).Hygroscopicity of urban aerosols and its link to size-resolved chemical composition during spring and summer in Seoul; Korea.Atmospheric Chemistry and Physics,20(19).
MLA	Kim N.,et al."Hygroscopicity of urban aerosols and its link to size-resolved chemical composition during spring and summer in Seoul; Korea".Atmospheric Chemistry and Physics 20.19(2020).