DOI: 10.1016/j.atmosres.2018.06.017
Scopus记录号: 2-s2.0-85049315617
论文题名: Characterization, sources, and light absorption of fine organic aerosols during summer and winter at an urban site
作者: Park S. ; Son S.-C. ; Lee S.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 213 起始页码: 370
结束页码: 380
语种: 英语
英文关键词: Absorption Ångström exponent
; Aerosol light absorption
; Brown carbon
; Dual-spot Aethalometer
; Humic-like substances
Scopus关键词: Aerosols
; Light absorption
; Organic carbon
; Urban growth
; Aerosol light absorption
; Aethalometer
; Brown carbons
; Humic-like substances
; In-situ measurement
; Primary combustions
; Spectral dependences
; Visible spectral regions
; Bromine compounds
; absorption
; aerosol
; aerosol composition
; biomass burning
; brown carbon
; humic substance
; in situ measurement
; light availability
; point source
; summer
; urban atmosphere
; winter
; Korea
英文摘要: In this study, the 24-h PM2.5 samples were collected from an urban site in Korea during summer and winter. The collected samples were analyzed for organic carbon (OC), elemental carbon (EC), water-soluble OC, humic-like substances (HULIS), and ionic species. Furthermore, in-situ measurements of PM2.5 aerosol absorption coefficients were made by using a dual-spot multi-wavelength Aethalometer. Primary traffic emissions and secondary formation were the major contributors to the HULIS concentration during summer. Furthermore, biomass burning (BB) contributed to HULIS concentration to a certain extent. During winter, the HULIS with higher OC/EC ratio (6.4) were strongly associated with BB and secondary formation, while the HULIS with lower OC/EC ratio (2.9) was mainly attributed to secondary formation and, to a certain extent, primary combustion sources. Light absorption by brown carbon (BrC) was significantly enhanced in the near-ultraviolet and visible spectral regions and exhibited strong spectral dependence. Ambient BrC absorption was estimated to account for 2.1–16.6% and 5.9–29.3% of the total aerosol absorption during summer and winter, respectively. The average values of absorption Ångström exponent (AAE) in the wavelength range of 370–660 nm for light-absorbing BrC aerosols were estimated to be 4.0 and 4.4 during summer and winter, respectively. This study demonstrates that the AAE values for BrC can be derived from multi-wavelength Aethalometer data without filter sampling and detailed laboratory analysis. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108792
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Environment and Energy Engineering, Chonnam National University, 77 Yongbong-ro, Gwangju, 61186, South Korea; Center for Gas Analysis, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon, 34113, South Korea
Recommended Citation:
Park S.,Son S.-C.,Lee S.. Characterization, sources, and light absorption of fine organic aerosols during summer and winter at an urban site[J]. Atmospheric Research,2018-01-01,213