DOI: 10.1016/j.atmosenv.2014.05.042
Scopus记录号: 2-s2.0-84901506819
论文题名: Measurement of the light absorbing properties of diesel exhaust particles using a three-wavelength photoacoustic spectrometer
作者: Guo X ; , Nakayama T ; , Yamada H ; , Inomata S ; , Tonokura K ; , Matsumi Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 94 起始页码: 428
结束页码: 437
语种: 英语
英文关键词: Aerosol optical property
; Black carbon (BC)
; Brown carbon
; Diesel exhaust particle (DEP)
; Lensing effect
; Photoacoustic spectroscopy (PAS)
Scopus关键词: Diesel engines
; Dynamometers
; Light absorption
; Optical properties
; Photoacoustic effect
; Photoacoustic spectroscopy
; Spectrometers
; Aerosol optical property
; Black carbon
; Brown carbons
; Diesel exhaust particles
; Lensing effect
; Wavelength
; ammonia
; black carbon
; diesel fuel
; nitrate
; organic matter
; absorption
; black carbon
; concentration (composition)
; diesel
; estimation method
; exhaust emission
; optical property
; particle size
; wavelength
; aerosol
; article
; car driving
; combustion
; diesel engine
; dynamometer
; exhaust gas
; heating
; lensing effect
; light absorption
; measurement
; optics
; photoacoustic soot spectrometer
; physical phenomena
; priority journal
; spectrometer
; temperature
; thickness
; velocity
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: Diesel-exhaust particles (DEP) are one of the main anthropogenic sources of black carbon (BC) and organic matter (OM). Understanding the optical properties of DEP, including the enhancement of light absorption by BC due to coating and light absorption by OM, is important for evaluating the climate impact of DEP. In this study, a three-wavelength photoacoustic soot spectrometer (405, 532, and 781nm) was used to investigate the wavelength-dependent optical properties of DEP emitted from a diesel engine vehicle running on a chassis dynamometer in transient driving mode (JE-05) and at a constant speed (either idling or driving at 70km/h). Optical properties were measured after passing the diluted exhaust through a heater, set at 20, 47, or 300°C (transient driving mode) or between 20 and 400°C (constant driving mode). The OM accounted for, on average, ~40 and ~35% of the total mass concentration of DEP during the transient and constant driving modes, respectively. In transient driving mode, enhancements of scattering coefficients at 20 and 47°C, and of the mass concentration of organics, were observed during the high-speed driving period (~80km/h) corresponding to driving on a highway. No difference was observed in the absorption coefficients between heated and unheated particles at 781nm for either the transient (including the high-speed driving period) or constant driving modes. These results indicate a lack of enhancement due to the lensing effect, possibly because the BC was mainly mixed externally with the OM or because it was located at the edges of particles under these experimental conditions. Contributions to total light absorption at 405nm by the OM were estimated by comparing the wavelength dependence of the absorption coefficients with and without heating. A significant contribution by light-absorbing OM (20±7%) to total light absorption at 405nm was observed during the high-speed driving period of the JE-05 mode, while the contributions were small during other periods in the JE-05 mode (0±8%) and the constant driving mode (idling: 4±12%; driving at 70km/h: 0±16%). © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80846
Appears in Collections: 气候变化事实与影响
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作者单位: Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan; National Traffic Safety and Environment Laboratory, 7-42-27 Jandaiji-Higashimachi, Chofu, Tokyo 182-0012, Japan; National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan; Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan
Recommended Citation:
Guo X,, Nakayama T,, Yamada H,et al. Measurement of the light absorbing properties of diesel exhaust particles using a three-wavelength photoacoustic spectrometer[J]. Atmospheric Environment,2014-01-01,94