gchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025784
A dual-chamber method for quantifying the effects of atmospheric perturbations on secondary organic aerosol formation from biomass burning emissions
Author: Tkacik D.S.; Robinson E.S.; Ahern A.; Saleh R.; Stockwell C.; Veres P.; Simpson I.J.; Meinardi S.; Blake D.R.; Yokelson R.J.; Presto A.A.; Sullivan R.C.; Donahue N.M.; Robinson A.L.
Source Publication: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
Indexed By: SCI ; SCI-E
Publishing Year: 2017
Volume: 122, Issue:11
pages begin: 6043
pages end: 6058
Language: 英语
Keyword: aerosol chemistry ; biomass burning ; combustion ; secondary organic aerosols
Subject in Chinese: 气溶胶 ; 排放物 ; 烟雾污染 ; 生物量 ; 生物质燃烧
English Abstract: Biomass burning (BB) is a major source of atmospheric pollutants. Field and laboratory studies indicate that secondary organic aerosol (SOA) formation from BB emissions is highly variable. We investigated sources of this variability using a novel dual-smog-chamber method that directly compares the SOA formation from the same BB emissions under two different atmospheric conditions. During each experiment, we filled two identical Teflon smog chambers simultaneously with BB emissions from the same fire. We then perturbed the smoke with UV lights, UV lights plus nitrous acid (HONO), or dark ozone in one or both chambers. These perturbations caused SOA formation in nearly every experiment with an average organic aerosol (OA) mass enhancement ratio of 1.78 ± 0.91 (mean ± 1σ). However, the effects of the perturbations were highly variable ranging with OA mass enhancement ratios ranging from 0.7 (30% loss of OA mass) to 4.4 across the set of perturbation experiments. There was no apparent relationship between OA enhancement and perturbation type, fuel type, and modified combustion efficiency. To better isolate the effects of different perturbations, we report dual-chamber enhancement (DUCE), which is the quantity of the effects of a perturbation relative to a reference condition. DUCE values were also highly variable, even for the same perturbation and fuel type. Gas measurements indicate substantial burn-to-burn variability in the magnitude and composition of SOA precursor emissions, even in repeated burns of the same fuel under nominally identical conditions. Therefore, the effects of different atmospheric perturbations on SOA formation from BB emissions appear to be less important than burn-to-burn variability. ©2017. American Geophysical Union. All Rights Reserved.
Funding Project: AGS-0936321 ; AGS-1256042
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被引频次[WOS]:14   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, United States; Department of Chemistry, University of Montana, Missoula, MT, United States; Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, United States; Department of Chemistry, University of California, Irvine, Irvine, CA, United States

Recommended Citation:
Tkacik D.S.,Robinson E.S.,Ahern A.,et al. A dual-chamber method for quantifying the effects of atmospheric perturbations on secondary organic aerosol formation from biomass burning emissions[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(11)
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