IEECAS OpenIR
Brownness of Organic Aerosol over the United States: Evidence for Seasonal Biomass Burning and Photobleaching Effects
Chen, Lung-Wen Antony1,5; Chow, Judith C.1,2; Wang, Xiaoliang1; Cao, Junji2,3; Mao, Jingqiu4; Watson, John G.1,2
Corresponding AuthorChen, Lung-Wen Antony(antony.chen@unlv.edu)
2021-07-06
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume55Issue:13Pages:8561-8572
AbstractLight-absorptivity of organic aerosol may play an important role in visibility and climate forcing, but it has not been assessed as extensively as black carbon (BC) aerosol. Based on multiwavelength thermal/optical analysis and spectral mass balance, this study quantifies BC for the U.S. Interagency Monitoring of Protected Visual Environments (IMPROVE) network while developing a brownness index (gamma(Br)) for non-BC organic carbon (OC*) to illustrate the spatiotemporal trends of light-absorbing brown carbon (BrC) content. OC* light absorption efficiencies range from 0 to 3.1 m(2) gC(-1) at 405 nm, corresponding to the lowest and highest BrC content of 0 and 100%, respectively. BC, OC*, and gamma(Br) explain >97% of the variability of measured spectral light absorption (405-980 nm) across 158 IMPROVE sites. Network-average OC* light absorptions at 405 nm are 50 and 28% those for BC over rural and urban areas, respectively. Larger organic fractions of light absorption occur in winter, partially due to higher organic brownness. Winter gamma(Br) exhibits a dramatic regional/urban-rural contrast consistent with anthropogenic BrC emissions from residential wood combustion. The spatial differences diminish to uniformly low gamma(Br) in summer, suggesting effective BrC photobleaching over the midlatitudes. An empirical relationship between BC, ambient temperature, and gamma(Br) is established, which can facilitate the incorporation of organic aerosol absorptivity into climate and visibility models that currently assume either zero or static organic light absorption efficiencies.
Keywordbrown carbon black carbon white carbon aerosol aging IMPROVE network hybrid environmental receptor model
DOI10.1021/acs.est.0c08706
WOS KeywordELEMENTAL CARBON ; BLACK CARBON ; SOURCE APPORTIONMENT ; LIGHT-ABSORPTION ; IMPROVE ; PM2.5 ; MASS ; TEMPERATURE ; AETHALOMETER ; EVOLUTION
Indexed BySCI ; SCI
Language英语
Funding ProjectU.S. National Park Service IMPROVE Carbon Analysis Contract[P16PC0022] ; National Science Foundation[AGS 2026821/2026824] ; University of Nevada, Las Vegas[2018001P] ; Institute of Earth Environment, Chinese Academy of Sciences[2018001P]
WOS Research AreaEngineering ; Environmental Sciences & Ecology
Funding OrganizationU.S. National Park Service IMPROVE Carbon Analysis Contract ; National Science Foundation ; University of Nevada, Las Vegas ; Institute of Earth Environment, Chinese Academy of Sciences
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000671872100011
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/16829
Collection中国科学院地球环境研究所
Corresponding AuthorChen, Lung-Wen Antony
Affiliation1.Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA
2.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China
3.Chinese Acad Sci, Inst Atmospher Phys, Beijing 100029, Peoples R China
4.Univ Alaska, Dept Chem & Biochem, Fairbanks, AK 99775 USA
5.Univ Nevada, Dept Environm & Occupat Hlth, Sch Publ Hlth, Las Vegas, NV 89154 USA
Recommended Citation
GB/T 7714
Chen, Lung-Wen Antony,Chow, Judith C.,Wang, Xiaoliang,et al. Brownness of Organic Aerosol over the United States: Evidence for Seasonal Biomass Burning and Photobleaching Effects[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2021,55(13):8561-8572.
APA Chen, Lung-Wen Antony,Chow, Judith C.,Wang, Xiaoliang,Cao, Junji,Mao, Jingqiu,&Watson, John G..(2021).Brownness of Organic Aerosol over the United States: Evidence for Seasonal Biomass Burning and Photobleaching Effects.ENVIRONMENTAL SCIENCE & TECHNOLOGY,55(13),8561-8572.
MLA Chen, Lung-Wen Antony,et al."Brownness of Organic Aerosol over the United States: Evidence for Seasonal Biomass Burning and Photobleaching Effects".ENVIRONMENTAL SCIENCE & TECHNOLOGY 55.13(2021):8561-8572.
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