DOI: 10.1002/jgrd.50373
论文题名: Chemical and hygroscopic properties of aerosol organics at Storm Peak Laboratory
作者: Hallar A.G. ; Lowenthal D.H. ; Clegg S.L. ; Samburova V. ; Taylor N. ; Mazzoleni L.R. ; Zielinska B.K. ; Kristensen T.B. ; Chirokova G. ; McCubbin I.B. ; Dodson C. ; Collins D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4767
结束页码: 4779
语种: 英语
Scopus关键词: Aerosols
; Mass spectrometry
; Organic compounds
; Storms
; Aerodynamic diameters
; Cloud condensation nuclei
; High molecular weight compounds
; Hygroscopic growth factor
; Hygroscopic properties
; New particle formation
; Storm Peak Laboratory
; Water-soluble materials
; Laboratories
; aerosol
; cloud condensation nucleus
; dust
; dust storm
; field survey
; hygroscopicity
; laboratory method
; mass spectrometry
; molecular analysis
; organic carbon
; solubility
; Colorado
; Park Range
; Rocky Mountains
; United States
英文摘要: A combined field and laboratory study was conducted to improve our understanding of the chemical and hygroscopic properties of organic compounds in aerosols sampled in the background continental atmosphere. PM2.5 (particles with aerodynamic diameters smaller than 2.5 μm) aerosols were collected from 24 June to 28 July 2010 at Storm Peak Laboratory (SPL) in the Park Range of northwestern Colorado. New particle formation (NPF) was frequent at SPL during this campaign, and the samples were not influenced by regional dust storms. Filter samples were analyzed for organic carbon (OC) and elemental carbon (EC), water soluble OC (WSOC), major inorganic ions, and detailed organic speciation. WSOC was isolated from inorganic ions using solid phase absorbents. Hygroscopic growth factors (GFs) and cloud condensation nucleus (CCN) activity of the WSOC were measured in the laboratory. Organic compounds compose the majority (average of 64% with a standard deviation (SD) of 9%) of the mass of measured species and WSOC accounted for an average of 89% (with a SD of 21%) of OC mass. Daily samples were composited according to back trajectories. On average, organic acids, sugars, and sugar alcohols accounted for 12.5 ± 6.2% (average ± SD) of WSOC. Based on the composition of these compounds and that of high molecular weight compounds identified using ultra high resolution mass spectrometry, the organic mass to OC ratio of the WSOC is estimated to be 2.04. The average hygroscopic GFs at RH = 80% (GF80 ) were 1.10 ± 0.03 for particles derived from isolated WSOC and 1.27 ± 0.03 for particles derived from the total water-soluble material (WSM). CCN activity followed a similar pattern. The critical diameters at a super-saturation of 0.35% were 0.072 ± 0.009 and 0.094 ± 0.006 μm for particles derived from WSM and isolated WSOC, respectively. These GF results compare favorably with estimates from thermodynamic models, which explicitly relate the water activity (RH) to concentration for the total soluble material identified in this study. Key Points Measured growth factor results compare favorably with estimates from models.WSOC accounted for an average of 89% of OC mass.The organic mass to organic carbon ratio of the WSOC from this study is 2.04. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63782
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Division of Atmospheric Science, Desert Research Institute, Reno NV, United States; Storm Peak Laboratory, Desert Research Institute, Steamboat Springs, CO, United States; University of California at Davis, Davis CA, United States; School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom; Department of Atmospheric Sciences, Texas AandM University, College Station TX, United States; Department of Chemistry, Michigan Technological University, Houghton MI, United States; Atmospheric Science Program, Michigan Technological University, Houghton MI, United States; Department of Chemistry, University of Copenhagen, Copenhagen, Denmark; CIRA, Colorado State University, Fort Collins CO, United States
Recommended Citation:
Hallar A.G.,Lowenthal D.H.,Clegg S.L.,et al. Chemical and hygroscopic properties of aerosol organics at Storm Peak Laboratory[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)