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DOI: 10.1002/2015GL066497
论文题名:
Size-dependent hygroscopicity parameter (κ) and chemical composition of secondary organic cloud condensation nuclei
作者: Zhao D.F.; Buchholz A.; Kortner B.; Schlag P.; Rubach F.; Kiendler-Scharr A.; Tillmann R.; Wahner A.; Flores J.M.; Rudich Y.; Watne A.K.; Hallquist M.; Wildt J.; Mentel T.F.
刊名: Geophysical Research Letters
ISSN: 0094-8325
EISSN: 1944-8056
出版年: 2015
卷: 42, 期:24
起始页码: 10920
结束页码: 10928
语种: 英语
英文关键词: chemical composition ; cloud condensation nuclei (CCN) activity ; hygroscopicity parameter ; secondary organic aerosol ; size dependence
Scopus关键词: Aerosols ; Condensation ; Chemical compositions ; Cloud condensation nuclei ; Hygroscopicity parameter ; Secondary organic aerosols ; Size dependence ; Atmospheric chemistry ; aerosol ; chemical composition ; cloud condensation nucleus ; hygroscopicity ; oxidation ; parameterization ; particle size ; photochemistry ; size effect ; volatilization
英文摘要: Secondary organic aerosol components (SOA) contribute significantly to the activation of cloud condensation nuclei (CCN) in the atmosphere. The CCN activity of internally mixed submicron SOA particles is often parameterized assuming a size-independent single-hygroscopicity parameter κ. In the experiments done in a large atmospheric reactor (SAPHIR, Simulation of Atmospheric PHotochemistry In a large Reaction chamber, Jülich), we consistently observed size-dependent κ and particle composition for SOA from different precursors in the size range of 50 nm-200 nm. Smaller particles had higher κ and a higher degree of oxidation, although all particles were formed from the same reaction mixture. Since decreasing volatility and increasing hygroscopicity often covary with the degree of oxidation, the size dependence of composition and hence of CCN activity can be understood by enrichment of higher oxygenated, low-volatility hygroscopic compounds in smaller particles. Neglecting the size dependence of κ can lead to significant bias in the prediction of the activated fraction of particles during cloud formation. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955205463&doi=10.1002%2f2015GL066497&partnerID=40&md5=13e766fdd531d9bc7ef1f502e03f5f88
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被引频次[WOS]:32   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7941
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Institute for Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich, Jülich, Germany

Recommended Citation:
Zhao D.F.,Buchholz A.,Kortner B.,et al. Size-dependent hygroscopicity parameter (κ) and chemical composition of secondary organic cloud condensation nuclei[J]. Geophysical Research Letters,2015-01-01,42(24).
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