DOI: 10.1016/j.atmosres.2017.12.002
Scopus记录号: 2-s2.0-85037699339
论文题名: Optical absorption characteristics of brown carbon aerosols during the KORUS-AQ campaign at an urban site
作者: Park S. ; Yu G.-H. ; Lee S.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 203 起始页码: 16
结束页码: 27
语种: 英语
英文关键词: Absorption Ångstrӧm exponent
; Brown carbon
; HULIS
; Light absorption coefficient
; Mass absorption efficiency
; Methanol and water extracts
Scopus关键词: Aerosols
; Air quality
; Efficiency
; Electromagnetic wave absorption
; Extraction
; Light absorption
; Linear regression
; Methanol
; Organic carbon
; Particulate emissions
; Urban growth
; Water absorption
; Brown carbons
; HULIS
; Light absorption coefficients
; Mass absorption
; Water extracts
; Bromine compounds
; absorption efficiency
; aerosol
; air quality
; brown carbon
; humic substance
; optical property
; organic carbon
; urban site
; Kwangju [Kwangju (ADS)]
; Kwangju [South Korea]
; South Korea
英文摘要: This study investigates the absorption characteristics of brown carbon (BrC) obtained from water and methanol extracts of fine particulate matter measured at an urban site in Gwangju, Korea during the KOREA U.S. – Air Quality campaign (May 2–June 11, 2016). The measurement period was classified into two intervals: biomass burning (BB) and non-BB periods. During the non-BB period, water-soluble organic carbon (WSOC) and humic-like substances (HULIS) primarily resulted from secondary organic aerosol (SOA) formation and primary vehicle emissions. Water-soluble organic aerosols during the BB period, meanwhile, were closely related to SOA formation and regionally transported BB emissions. The light absorption coefficient measured at 365 nm (babs,365) by methanol extracts was 2.6 and 6.1 times higher than the coefficients from the water and HULIS extracts, respectively, indicating the importance of BrC absorption by water-insoluble organic carbon. This was demonstrated by a good correlation between the water-insoluble BrC absorption and the elemental carbon concentration. A comparison of babs,365 between the methanol- and water-extracted BrC indicated that water-insoluble BrC accounted for approximately 61% (33–86%) of the total BrC absorption. The contributions of SOA, primary BB emissions, and traffic emissions to the water extract babs,365 were estimated using a stepwise multiple linear regression (MLR) analysis and found to be 1.17 ± 0.55, 0.65 ± 0.62, and 0.25 ± 0.09 Mm− 1, respectively, accounting for 59.6, 26.1, and 14.3% of the absorption coefficient by the water-soluble BrC. Further, it was determined that the contribution of the BB emissions to the water-soluble BrC absorption was approximately two times higher in the BB period than in the non-BB period. The average absorption Ångstrӧm exponent was 4.8 ± 0.3, 5.3 ± 0.7, and 6.8 ± 0.8 for the methanol, water, and HULIS extracts, respectively. The average mass absorption efficiency (MAE365) of methanol extracted BrC was 1.3 ± 0.4 m2/g·C. Water- and HULIS-extracted BrC had a MAE365 of 1.0 ± 0.3 and 0.8 ± 0.3 m2/g·C, respectively. These results suggest that methanol-extracted BrC could provide a better estimation of BrC absorption compared to WSOC and HULIS. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108942
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, Buk-ku, 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.,Yu G.-H.,Lee S.. Optical absorption characteristics of brown carbon aerosols during the KORUS-AQ campaign at an urban site[J]. Atmospheric Research,2018-01-01,203