DOI: 10.1002/2015GL064556
论文题名: Direct atmospheric evidence for the irreversible formation of aqueous secondary organic aerosol
作者: El-Sayed M.M.H. ; Wang Y. ; Hennigan C.J.
刊名: Geophysical Research Letters
ISSN: 0094-9216
EISSN: 1944-8947
出版年: 2015
卷: 42, 期: 13 起始页码: 5577
结束页码: 5586
语种: 英语
英文关键词: aqueous secondary organic aerosol (aqSOA)
; partitioning
; water-soluble organic carbon
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric humidity
; Evaporation
; Atmospheric measurement
; Condensed phase
; Laboratory studies
; partitioning
; Secondary organic aerosols
; Statistically significant difference
; Water evaporation
; Water-soluble organic carbon
; Organic carbon
; aerosol composition
; ambient air
; aqueous solution
; organic carbon
; organic compound
; relative humidity
; solubility
; Baltimore
; Maryland
; United States
英文摘要: The reversible nature of aqueous secondary organic aerosol (aqSOA) formation was characterized for the first time through direct atmospheric measurements. Water-soluble organic carbon in the gas and particle phases (WSOCg and WSOCp ) was measured simultaneously to quantify aqSOA formation in Baltimore, Maryland. During the nighttime, aqSOA formation was evident as WSOCg increasingly partitioned to the particle phase with increasing relative humidity (RH). To characterize the reversible/irreversible nature of this aqSOA, the WSOCp measurement was alternated through an unperturbed ambient channel and through a "dried" channel maintained at ∼40% RH (with 7 s residence time) to mimic the natural drying particles undergo throughout the day. Across the entire RH range encountered, there was no statistically significant difference in WSOCp concentrations through the dry and ambient channels, indicating that the aqSOA remained in the condensed phase upon the evaporation of aerosol water. This strongly suggests that the observed aqSOA was formed irreversibly. Key Points WSOCg taken up into aerosol water does not volatilize upon water evaporation This demonstrates irreversible aqSOA formation in atmospheric aerosol water This has direct implications for interpreting prior laboratory studies of aqSOA. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938053969&doi=10.1002%2f2015GL064556&partnerID=40&md5=f9fdf164a1cdb38ef86cd5b85f68f958
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8832
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: Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD, United States
Recommended Citation:
El-Sayed M.M.H.,Wang Y.,Hennigan C.J.. Direct atmospheric evidence for the irreversible formation of aqueous secondary organic aerosol[J]. Geophysical Research Letters,2015-01-01,42(13).