DOI: 10.1016/j.atmosenv.2014.03.047
Scopus记录号: 2-s2.0-84897487274
论文题名: Correlations between absorption Angström exponent (AAE) of wintertime ambient urban aerosol and its physical and chemical properties
作者: Utry N ; , Ajtai T ; , Filep T ; , Pintér M ; , Török Z ; , Bozóki Z ; , Szabó G
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 91 起始页码: 52
结束页码: 59
语种: 英语
英文关键词: Absorption
; Aerosol
; Angström exponent
; Levoglucosan
; Photoacoustic spectroscopy
; Wood burning
Scopus关键词: Absorption
; Heating
; Light absorption
; Particle size
; Photoacoustic spectroscopy
; Wavelength
; Aerosol chemical composition
; Levoglucosan
; Measurement campaign
; Optical absorption coefficients
; Photoacoustic measurements
; Physical and chemical properties
; Regression coefficient
; Wood burning
; Aerosols
; carbon
; elemental carbon
; organic carbon
; unclassified drug
; aerosol property
; ambient air
; biomass burning
; heating
; particle size
; physicochemical property
; size distribution
; urban atmosphere
; winter
; absorption
; absorption Angstrom exponent
; aerosol
; article
; chemical composition
; concentration (parameters)
; heating
; household
; mass
; particle size
; photoacoustics
; physical chemistry
; priority journal
; traffic
; ultraviolet radiation
; urban area
; winter
; Fejer
; Hungary
; Szeged
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Based on a two-week measurement campaign in an environment heavily polluted both by transit traffic and household heating in the inner city of Szeged (Hungary), correlations between the absorption Angström exponent (AAE) fitted to the optical absorption coefficients measured with a four wavelength (1064, 532, 355 and 266nm) photoacoustic aerosol measuring system (4. λ-PAS) and various aerosol parameters were identified. AAE was found to depend linearly on OCwb/EC and on NGM100/NGMD20, i.e. on the ratio of mass concentrations of elemental carbon (EC) to the fraction of organic carbon associated with wood burning (OCwb), and on the ratio of aerosol number concentrations in the 20nm (NGMD20) to 100nm (NGMD100) modes, with a regression coefficient of R=0.95 and R=0.86, respectively. In the daily fluctuation of AAE two minima were identified, which coincide with the morning and afternoon rush hours, during which NGMD20 exhibits maximum values. During the campaign the shape of the aerosol volume size distribution (. dV/. dlog. D) was found to be largely invariant, supporting the assumption that the primary driver for the AAE variation was aerosol chemical composition rather than particle size. Furthermore, when wavelength segregated AAE values were calculated, AAE for the shorter wavelengths (AAE355-266) was also found to depend linearly on the above mentioned ratios with similar regression coefficients but with a much steeper correlation line, while the AAE for the longer wavelengths (AAE1064-532) exhibits only a considerably weaker correlation. These results prove the unique advantages of real time multi-wavelength photoacoustic measurement of optical absorption in case the wavelength range includes the ultra-violet too. © 2014 . Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80963
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: University of Szeged, Department of Optics and Quantum Electronics, Dóm tér 9, 6720 Szeged, Hungary; Hungarian Academy of Sciences, Univ. of Szeged (MTA-SZTE) Research Group on Photoacoustic Spectroscopy, Dóm tér 9, 6720 Szeged, Hungary; Hungarian Academy of Sciences, Institute of Nuclear Research, P.O.B. 51, H-4001 Debrecen, Hungary
Recommended Citation:
Utry N,, Ajtai T,, Filep T,et al. Correlations between absorption Angström exponent (AAE) of wintertime ambient urban aerosol and its physical and chemical properties[J]. Atmospheric Environment,2014-01-01,91