气候变化领域集成服务门户(CCPortal): Absorption and radiative characteristics of brown carbon aerosols during crop residue burning in the source region of Indo-Gangetic Plain

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DOI	10.1016/j.atmosres.2020.105285
	Absorption and radiative characteristics of brown carbon aerosols during crop residue burning in the source region of Indo-Gangetic Plain
	Choudhary V.; Singh G.K.; Gupta T.; Paul D.
发表日期	2021
ISSN	0169-8095
卷号	249
英文摘要	The north-western Indo-Gangetic Plain (IGP) experiences massive crop-residue burning (viz. paddy and wheat) on an annual and seasonal basis. The long-range transport of the particulates emitted from paddy- and wheat-residue burning (expressed as PRB and WRB, respectively) degrades the air quality, perturb the radiative budget, and alter the atmospheric chemistry of downwind IGP locations. Therefore, chemical, absorption and radiative characteristics of carbonaceous aerosols (total carbon; TC) were explored in this study. The fraction of TC in ambient PM2.5 (particulates with aerodynamic diameter ≤ 2.5 μm) was ~45% during PRB and ~24% during WRB. However, biomass burning emissions were the predominant source of TC during both PRB and WRB. The brown carbon (BrC) aerosols at Beas were ~2–3 times more abundant during PRB than in WRB. However, the absorption properties such as mass absorption efficiency and imaginary component of the refractive index for BrC at 405 nm (expressed as MAEBrC-405, kBrC-405, respectively) and radiative characteristics such as light absorption capacity were similar during both PRB and WRB. The similarity between these absorption and radiative characteristics indicate that BrC aerosols emitted during the burning of different biomass may depend only on their combustion condition. Further, the increased biomass burning emissions were linked with enhancement in the light absorption capacity of BrC during PRB. A similar light absorption capacity was observed (~30 W/g) for water-soluble BrC (WS-BrC) and total BrC during PRB. Moreover, the % contribution of BrC and EC to their total direct radiative forcing (DRFTC) during PRB and WRB (~40% and ~60% for BrC and EC, respectively) were also similar. The WS-BrC constitutes only ~15% of DRFTC during PRB. This difference signifies that non-WS-BrC aerosols were the predominant light-absorbing species during PRB (compared to WS-BrC), which needs to be factored into global climate models to mitigate uncertainties. © 2020 Elsevier B.V.
英文关键词	Biomass burning; Carbonaceous aerosols; Direct radiative forcing; Light absorption capacity; Mass absorption efficiency
语种	英语
scopus关键词	Aerosols; Agricultural wastes; Air quality; Atmospheric chemistry; Atmospheric movements; Atmospheric radiation; Biomass; Budget control; Carbon; Climate models; Crops; Light absorption; Particles (particulate matter); Refractive index; Water absorption; Aerodynamic diameters; Biomass burning emissions; Carbonaceous aerosol; Combustion condition; Direct radiative forcing; Indo-Gangetic Plains; Long range transport; Radiative characteristics; Bromine compounds; absorption; aerosol; biogenic emission; biomass burning; brown carbon; climate modeling; crop residue; long range transport; radiative forcing; Gangetic Plain; Triticum aestivum
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141662
作者单位	Department of Civil Engineering and APTL at Center for Environmental Science and Engineering (CESE), Indian Institute of Technology Kanpur, Kanpur, 208 016, India; Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur, 208 016, India
推荐引用方式 GB/T 7714	Choudhary V.,Singh G.K.,Gupta T.,et al. Absorption and radiative characteristics of brown carbon aerosols during crop residue burning in the source region of Indo-Gangetic Plain[J],2021,249.
APA	Choudhary V.,Singh G.K.,Gupta T.,&Paul D..(2021).Absorption and radiative characteristics of brown carbon aerosols during crop residue burning in the source region of Indo-Gangetic Plain.Atmospheric Research,249.
MLA	Choudhary V.,et al."Absorption and radiative characteristics of brown carbon aerosols during crop residue burning in the source region of Indo-Gangetic Plain".Atmospheric Research 249(2021).