DOI: 10.1002/jgrd.50767
论文题名: Light absorption by secondary organic aerosol from α-pinene: Effects of oxidants, seed aerosol acidity, and relative humidity
作者: Song C. ; Gyawali M. ; Zaveri R.A. ; Shilling J.E. ; Arnott W.P.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11741
结束页码: 11749
语种: 英语
英文关键词: brown carbon
; light absorption
; organic nitrate
; photoacoustic spectrometer
; secondary organic aerosol
Scopus关键词: Condensation reactions
; Fog
; Light absorption
; Monoterpenes
; Nitrates
; Photoacoustic effect
; Spectrometers
; Sulfur compounds
; Absorption and scatterings
; Atmospheric conditions
; Black carbon aerosol
; Brown carbons
; Organic nitrates
; Photoacoustic spectrometers
; Secondary organic aerosols
; UV spectral regions
; Aerosols
; absorption
; acidity
; aerosol composition
; aerosol property
; carbon
; climate forcing
; dust
; light scattering
; nitrate (ester)
; organic compound
; oxidant
; ozone
; relative humidity
; spectrometer
; ultraviolet radiation
英文摘要: It is well known that light absorption from dust and black carbon aerosols has a warming effect on climate while light scattering from sulfate, nitrate, and sea salt aerosols has a cooling effect. However, there are large uncertainties associated with light absorption and scattering by different types of organic aerosols, especially in the near-UV and UV spectral regions. In this paper, we present the results from a systematic laboratory study focused on measuring light absorption by secondary organic aerosols (SOAs) generated from dark α-pinene + O3 and α-pinene + NOx + O 3 systems in the presence of neutral and acidic sulfate seed aerosols. Light absorption was monitored using photoacoustic spectrometers at four different wavelengths: 355, 405, 532, and 870 nm. Significant light absorption at 355 and 405 nm was observed for the SOA formed from α-pinene + O3 + NO3 system only in the presence of highly acidic sulfate seed aerosols under dry conditions. In contrast, no absorption was observed when the relative humidity was elevated to greater than 27% or in the presence of neutral sulfate seed aerosols. Organic nitrates in the SOA formed in the presence of neutral sulfate seed aerosols were found to be nonabsorbing, while the light-absorbing compounds are speculated to be aldol condensation oligomers with nitroxy organosulfate groups that are formed in highly acidic sulfate aerosols. Overall, these results suggest that dark α-pinene + O3 and α-pinene + NOx + O3 systems do not form light-absorbing SOA under typical atmospheric conditions. Key Points a-pinene SOA absorbs UV and near UV radiation ©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/63218
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland WA, United States; R. J. Reynolds Tobacco Company, 401 N. Main St, Winston-Salem, NC 27101, United States; Department of Physics, University of Nevada Reno, Nevada System of Higher Education, Reno NV, United States; Desert Research Institute, Nevada System of Higher Education, Reno NV, United States
Recommended Citation:
Song C.,Gyawali M.,Zaveri R.A.,et al. Light absorption by secondary organic aerosol from α-pinene: Effects of oxidants, seed aerosol acidity, and relative humidity[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)