Brownness of Organic Aerosol over the United States: Evidence for Seasonal Biomass Burning and Photobleaching Effects

doi:10.1021/acs.est.0c08706

IEECAS OpenIR

	Brownness of Organic Aerosol over the United States: Evidence for Seasonal Biomass Burning and Photobleaching Effects
	Chen, Lung-Wen Antony 1,5; Chow, Judith C.1,2; Wang, Xiaoliang 1; Cao, Junji 2,3; Mao, Jingqiu 4; Watson, John G.1,2
通讯作者	Chen, Lung-Wen Antony(antony.chen@unlv.edu)
	2021-07-06
发表期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN	0013-936X
卷号	55 期号:13 页码:8561-8572
摘要	Light-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.
关键词	brown carbon black carbon white carbon aerosol aging IMPROVE network hybrid environmental receptor model
DOI	10.1021/acs.est.0c08706
关键词[WOS]	ELEMENTAL CARBON ; BLACK CARBON ; SOURCE APPORTIONMENT ; LIGHT-ABSORPTION ; IMPROVE ; PM2.5 ; MASS ; TEMPERATURE ; AETHALOMETER ; EVOLUTION
收录类别	SCI ; SCI
语种	英语
资助项目	U.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研究方向	Engineering ; Environmental Sciences & Ecology
项目资助者	U.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类目	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:000671872100011
出版者	AMER CHEMICAL SOC
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/16829
专题	中国科学院地球环境研究所
通讯作者	Chen, Lung-Wen Antony
作者单位	1.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
推荐引用方式 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.