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Carbonaceous aerosols in megacity Xi'an, China: Implications of thermal/optical protocols comparison
Han, Y. M.1,2,3; Chen, L. -W. A.4,5; Huang, R. -J.1,2,6; Chow, J. C.1,2,5; Watson, J. G.1,2,5; Ni, H. Y.1,2; Liu, S. X.1,2; Fung, K. K.7; Shen, Z. X.3; Wei, C.1,2,8; Wang, Q. Y.1,2; Tian, J.1,2; Zhao, Z. Z.1,2; Prevot, Andre S. H.1,2,6; Cao, J. J.1,2
AbstractCarbonaceous aerosol is an important component that influences the environment, climate, and human health. Organic and elemental carbon (OC and EC) are the two main constituents of carbonaceous aerosols that have opposite, i.e., cooling versus warming, effects on the Earth's radiation balance. Knowledge on the variability of OC/EC splits measured by different thermal/optical protocols is useful for understanding the uncertainty in the climate models. This study shows good correlations within OC or EC (r(2) > 0.83, P < 0.001) across the IMPROVE, IMPROVE_A, and EUSAAR_2 protocols for both ambient aerosol samples and biomass burning samples. However, EC concentrations differ by more than two folds, and OC/EC ratios differ up to a factor of 2.7. The discrepancies were attributed to the selection between the reflectance and transmittance corrections and the different peak inert-atmosphere temperature. The IMPROVE and IMPROVE_A protocols also quantified different char and soot concentrations, two subtypes of EC with distinct chemical and optical properties. Char, but not soot, was found to correlate with the humic-like substances (HULIS) content in the samples, suggesting that both char and HULLS originate mainly from biomass burning. A one-year (2012-2013) ambient aerosol monitoring in Xi'an, China, shows that OC, EC, and char displayed winter highs and summer lows, while soot had no seasonal trend. The char/soot ratios showed a "single peak" in winter, while OC/EC ratios exhibited "dual peak" feature due to the influence of secondary organic aerosol formation. In addition to commonly measured OC and EC, we recommend both char and soot from a common reference method to be considered in the chemical transport and climate models. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordThermal/optical Protocols Carbonaceous Aerosols Organic And Elemental Carbon Measurement Char And Soot Biomass Burning Emissions Temporal Variations Climatic Implications
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000374614500007
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, SKLLQG, Xian 710061, Peoples R China
2.Chinese Acad Sci, Key Lab Aerosol Chem & Phys, Inst Earth Environm, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China
4.Univ Nevada, Dept Environm & Occupat Hlth, Las Vegas, NV 89154 USA
5.Desert Res Inst, Div Atmospher Sci, 2215 Raggio Pkwy, Reno, NV 89512 USA
6.Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland
7.AtmAA Inc, 23917 Craftsman Rd, Calabasas, CA 91302 USA
8.Chinese Acad Sci, Shanghai Adv Res Inst, SCDRC, Shanghai 201210, Peoples R China
Recommended Citation
GB/T 7714
Han, Y. M.,Chen, L. -W. A.,Huang, R. -J.,et al. Carbonaceous aerosols in megacity Xi'an, China: Implications of thermal/optical protocols comparison[J]. ATMOSPHERIC ENVIRONMENT,2016,132(2016):58-68.
APA Han, Y. M..,Chen, L. -W. A..,Huang, R. -J..,Chow, J. C..,Watson, J. G..,...&Cao, J. J..(2016).Carbonaceous aerosols in megacity Xi'an, China: Implications of thermal/optical protocols comparison.ATMOSPHERIC ENVIRONMENT,132(2016),58-68.
MLA Han, Y. M.,et al."Carbonaceous aerosols in megacity Xi'an, China: Implications of thermal/optical protocols comparison".ATMOSPHERIC ENVIRONMENT 132.2016(2016):58-68.
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