气候变化领域集成服务门户(CCPortal): Emissions of organic compounds from western US wildfires and their near-fire transformations

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DOI	10.5194/acp-22-9877-2022
	Emissions of organic compounds from western US wildfires and their near-fire transformations
	Liang, Yutong; Stamatis, Christos; Fortner, Edward C.; Wernis, Rebecca A.; Van Rooy, Paul; Majluf, Francesca; Yacovitch, Tara, I; Daube, Conner; Herndon, Scott C.; Kreisberg, Nathan M.; Barsanti, Kelley C.; Goldstein, Allen H.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9877
结束页码	9893
卷号	22 期号:15 页码:17
英文摘要	The size and frequency of wildfires in the western United States have been increasing, and this trend is projected to continue, with increasing adverse consequences for human health. Gas- and particle-phase organic compounds are the main components of wildfire emissions. Some of the directly emitted compounds are hazardous air pollutants, while others can react with oxidants to form secondary air pollutants such as ozone and secondary organic aerosol (SOA). Further, compounds emitted in the particle phase can volatize during smoke transport and can then serve as precursors for SOA. The extent of pollutant formation from wildfire emissions is dependent in part on the speciation of organic compounds. The most detailed speciation of organic compounds has been achieved in laboratory studies, though recent field campaigns are leading to an increase in such measurements in the field. In this study, we identified and quantified hundreds of gas- and particle-phase organic compounds emitted from conifer-dominated wildfires in the western US, using two two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC x GC ToF-MS) instruments. Observed emission factors (EFs) and emission ratios are reported for four wildfires. As has been demonstrated previously, modified combustion efficiency (MCE) was a good predictor of particle-phase EFs (e.g., R-2=0.78 and 0.84 for sugars and terpenoids, respectively), except for elemental carbon. Higher emissions of diterpenoids, resin acids, and monoterpenes were observed in the field relative to laboratory studies, likely due to distillation from unburned heated vegetation, which may be underrepresented in laboratory studies. These diterpenoids and resin acids accounted for up to 45 % of total quantified organic aerosol, higher than the contribution from sugar and sugar derivatives. The low volatility of resin acids makes them ideal markers for conifer fire smoke. The speciated measurements also show that evaporation of semi-volatile organic compounds took place in smoke plumes, which suggests that the evaporated primary organic aerosol can be a precursor of SOAs in wildfire smoke plumes.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000835273000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273523
作者单位	University of California System; University of California Berkeley; University of California System; University of California Riverside; University of California System; University of California Riverside; Aerodyne Research; University of California System; University of California Berkeley; Virginia Polytechnic Institute & State University
推荐引用方式 GB/T 7714	Liang, Yutong,Stamatis, Christos,Fortner, Edward C.,et al. Emissions of organic compounds from western US wildfires and their near-fire transformations[J],2022,22(15):17.
APA	Liang, Yutong.,Stamatis, Christos.,Fortner, Edward C..,Wernis, Rebecca A..,Van Rooy, Paul.,...&Goldstein, Allen H..(2022).Emissions of organic compounds from western US wildfires and their near-fire transformations.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(15),17.
MLA	Liang, Yutong,et al."Emissions of organic compounds from western US wildfires and their near-fire transformations".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.15(2022):17.