气候变化领域集成服务门户(CCPortal): Sources and characteristics of light-absorbing fine particulates over Delhi through the synergy of real-time optical and chemical measurements

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DOI	10.1016/j.atmosenv.2021.118338
	Sources and characteristics of light-absorbing fine particulates over Delhi through the synergy of real-time optical and chemical measurements
	Singh A.; Rastogi N.; Kumar V.; Slowik J.G.; Satish R.; Lalchandani V.; Thamban N.M.; Rai P.; Bhattu D.; Vats P.; Ganguly D.; Tripathi S.N.; Prévôt A.S.H.
发表日期	2021
ISSN	1352-2310
卷号	252
英文摘要	This study examines the light absorption characteristics of fine atmospheric particulates using the co-located real-time measurements of chemical and optical aerosol characteristics at a site located in Delhi during winter. The contribution of absorption by black carbon and brown carbon (BC and BrC) to the total absorption (babs) is computed using the absorption Ångström exponent (AAE) method. The period average contribution of BrC absorption (babs_BrC) to babs is found to be highest at 370 nm (23%) that decreased exponentially with increasing wavelengths, i.e.,18, 12, 10, and 4% at 470, 520, 590, and 660 nm, respectively. The absorption spectrum of BrC is used to study the bulk composition of BrC, which indicates that primary BrC was dominant during morning and night time, whereas secondary BrC was significant during the rest of the time. Further, organic aerosols (OA) were divided into different factors using positive-matrix factorization (PMF) analysis, and the mass absorption efficiency (Eabs) of each factor was assessed through multivariate linear regression of babs_BrC with OA factors. The biomass burning OA (BBOA) exhibited the highest Eabs at 370 nm (0.86 m2 g−1), followed by semi-volatile oxygenated OA (SVOOA; 0.67 m2 g−1) and hydrocarbon-like OA (HOA; 0.42 m2 g−1). Further, although the composition of OA was dominated by LVOOA (32%) and BBOA (32%), followed by SVOOA (22%), and HOA (14%), their contribution to bBrC followed different order due to differences in their mass absorption efficiencies. The BBOA contributed almost half (48%) of babs_BrC followed by SVOOA (26%), and HOA (10%). This study provides quantitative information on the sources of BrC and their relative contribution to BrC absorption over a heavily polluted region, which is still lacking in the literature. These results have implications in understanding the source-specific BrC absorption. © 2021 Elsevier Ltd
关键词	Absorption Black carbon Brown carbon Carbonaceous aerosol India Megacity PMF
语种	英语
scopus关键词	Absorption; Absorption spectroscopy; Aerosols; Bromine compounds; Carbon; Efficiency; Light absorption; Absorption efficiency; Biomass-burning; Black carbon; Brown carbons; Carbonaceous aerosol; India; Mass absorption; Megacities; Organic aerosol; Positive Matrix Factorization; Factorization; black carbon; carbon; hydrocarbon; absorption spectrum; aerosol; biomass burning; black carbon; brown carbon; measurement method; particulate matter; pollutant source; real time; seasonal variation; absorption; absorption spectroscopy; aerosol; Article; biomass; chemical analysis; controlled study; India; light absorption; optics; oxygenation; particulate matter; priority journal; time; Delhi; India
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248511
作者单位	Geosciences Division, Physical Research Laboratory, Ahmedabad, 380009, India; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen PSI, 5232, Switzerland; Department of Civil Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India; Centre for Atmospheric Sciences, Indian Institute of Technology, New Delhi, 110016, India
推荐引用方式 GB/T 7714	Singh A.,Rastogi N.,Kumar V.,et al. Sources and characteristics of light-absorbing fine particulates over Delhi through the synergy of real-time optical and chemical measurements[J],2021,252.
APA	Singh A..,Rastogi N..,Kumar V..,Slowik J.G..,Satish R..,...&Prévôt A.S.H..(2021).Sources and characteristics of light-absorbing fine particulates over Delhi through the synergy of real-time optical and chemical measurements.ATMOSPHERIC ENVIRONMENT,252.
MLA	Singh A.,et al."Sources and characteristics of light-absorbing fine particulates over Delhi through the synergy of real-time optical and chemical measurements".ATMOSPHERIC ENVIRONMENT 252(2021).