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Brown Carbon Aerosol in Urban Xi'an, Northwest China: The Composition and Light Absorption Properties
Huang, Ru-Jin; Yang, Lu; Cao, Junji; Chen, Yang; Chen, Qi; Li, Yongjie; Duan, Jing; Zhu, Chongshu; Dai, Wenting; Wang, Kai; Lin, Chunshui; Ni, Haiyan; Corbin, Joel C.; Wu, Yunfei; Zhang, Renjian; Tie, Xuexi; Hoffmann, Thorsten; O'Dowd, Colin; Dusek, Uli
2018-06-19
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume52Issue:12Pages:6825-6833
AbstractLight-absorbing organic carbon (i.e., brown carbon or BrC) in the atmospheric aerosol has significant contribution to light absorption and radiative forcing. However, the link between BrC optical properties and chemical composition remains poorly constrained. In this study, we combine spectrophotometric measurements and chemical analyses of BrC samples collected from July 2008 to June 2009 in urban Xi'an, Northwest China. Elevated BrC was observed in winter (5 times higher than in summer), largely due to increased emissions from wintertime domestic biomass burning. The light absorption coefficient of methanol-soluble BrC at 365 nm (on average approximately twice that of water-soluble BrC) was found to correlate strongly with both parent polycyclic aromatic hydrocarbons (parent-PAHs, 27 species) and their carbonyl oxygenated derivatives (carbonyl-OPAHs, 15 species) in all seasons (r(2) > 0.61). These measured parent-PAHs and carbonyl-OPAHs account for on average similar to 1.7% of the overall absorption of methanol-soluble BrC, about 5 times higher than their mass fraction in total organic carbon (OC, similar to 0.35%). The fractional solar absorption by BrC relative to element carbon (EC) in the ultraviolet range (300-400 nm) is significant during winter (42 +/- 18% for water-soluble BrC and 76 +/- 29% for methanol-soluble BrC), which may greatly affect the radiative balance and tropospheric photochemistry and therefore the climate and air quality.
DOI10.1021/acs.est.8b02386
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000436018900013
PublisherAMER CHEMICAL SOC
The Source to ArticleWOS
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被引频次[WOS]:9   [WOS记录]     [WOS相关记录]
Document TypeJournal article
专题University of Macau
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GB/T 7714
Huang, Ru-Jin,Yang, Lu,Cao, Junji,et al. Brown Carbon Aerosol in Urban Xi'an, Northwest China: The Composition and Light Absorption Properties[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(12):6825-6833.
APA Huang, Ru-Jin.,Yang, Lu.,Cao, Junji.,Chen, Yang.,Chen, Qi.,...&Dusek, Uli.(2018).Brown Carbon Aerosol in Urban Xi'an, Northwest China: The Composition and Light Absorption Properties.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(12),6825-6833.
MLA Huang, Ru-Jin,et al."Brown Carbon Aerosol in Urban Xi'an, Northwest China: The Composition and Light Absorption Properties".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.12(2018):6825-6833.
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