DOI: 10.1002/jgrd.50307
论文题名: Composition and hygroscopicity of the Los Angeles Aerosol: CalNex
作者: Hersey S.P. ; Craven J.S. ; Metcalf A.R. ; Lin J. ; Lathem T. ; Suski K.J. ; Cahill J.F. ; Duong H.T. ; Sorooshian A. ; Jonsson H.H. ; Shiraiwa M. ; Zuend A. ; Nenes A. ; Prather K.A. ; Flagan R.C. ; Seinfeld J.H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 3016
结束页码: 3036
语种: 英语
Scopus关键词: Aerosols
; Biomass
; Soot
; Thickness measurement
; Aerosol composition
; Aerosol time-of-flight mass spectrometers
; Coating thickness
; Los Angeles Basin
; Secondary materials
; Semi-volatile materials
; Single parameter
; Water-soluble organics
; Atmospheric movements
; aerosol composition
; aerosol property
; airborne survey
; biomass burning
; black carbon
; cloud condensation nucleus
; hygroscopicity
; outflow
; photochemistry
; photometer
; saturation
; volatilization
; California
; Los Angeles [California]
; United States
英文摘要: Aircraft-based measurements of aerosol composition, either bulk or single-particle, and both subsaturated and supersaturated hygroscopicity were made in the Los Angeles Basin and its outflows during May 2010 during the CalNex field study. Aerosol composition evolves from source-rich areas in the western Basin to downwind sites in the eastern Basin, evidenced by transition from an external to internal mixture, as well as enhancements in organic O: C ratio, the amount of organics and nitrate internally mixed on almost all particle types, and coating thickness on refractory black carbon (rBC). Transport into hot, dilute outflow regions leads to significant volatilization of semivolatile material, resulting in a unimodal aerosol comprising primarily oxygenated, low-volatility, water-soluble organics and sulfate. The fraction of particles with rBC or soot cores is between 27 and 51% based on data from a Single Particle Soot Photometer (SP2) and Aerosol Time of Flight Mass Spectrometer (ATOFMS). Secondary organics appear to inhibit subsaturated water uptake in aged particles, while CCN activity is enhanced with photochemical age. A biomass-burning event resulted in suppression of subsaturated hygroscopicity but enhancement in CCN activity, suggesting that BB particles may be nonhygroscopic at subsaturated RH but are important sources of CCN. Aerosol aging and biomass burning can lead to discrepancies between subsaturated and supersaturated hygroscopicity that may be related to mixing state. In the cases of biomass burning aerosol and aged particles coated with secondary material, more than a single parameter representation of subsaturated hygroscopicity and CCN activity is needed. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: NA09OAR4310128
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63825
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: California Institute of Technology, Pasadena, CA, United States; Combustion Research Facility, Sandia National Laboratories, Livermore, CA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; University of California, San Diego, San Diego, CA, United States; University of Arizona, Tucson, AZ, United States; Naval Postgraduate School, Monterey, CA, United States; School of Earth and Atmospheric Sciences, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, United States
Recommended Citation:
Hersey S.P.,Craven J.S.,Metcalf A.R.,et al. Composition and hygroscopicity of the Los Angeles Aerosol: CalNex[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)