气候变化领域集成服务门户(CCPortal): Chemical composition of PM2.5 in October 2017 Northern California wildfire plumes

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DOI	10.5194/acp-21-5719-2021
	Chemical composition of PM2.5 in October 2017 Northern California wildfire plumes
	Liang Y.; Jen C.N.; Weber R.J.; Misztal P.K.; Goldstein A.H.
发表日期	2021
ISSN	1680-7316
起始页码	5719
结束页码	5737
卷号	21 期号:7
英文摘要	Wildfires have become more common and intense in the western US over recent decades due to a combination of historical land management practices and warming climate. Emissions from large-scale fires now frequently affect populated regions such as the San Francisco Bay Area during the fall wildfire season, with documented impacts of the resulting particulate matter on human health. Health impacts of exposure to wildfire emissions depend on the chemical composition of particulate matter, but the molecular composition of the real biomass burning organic aerosol (BBOA) that reaches large population centers remains insufficiently characterized. We took PM2:5 (particles having aerodynamic diameters less than or equal to 2.5 μm) samples at the University of California, Berkeley campus (~60 km downwind of the fires) during the October 2017 Northern California wildfires period and analyzed molecular composition of OA using a two-dimensional gas chromatography coupled with highresolution time-of-flight mass spectrometry (GC-GC HRToF- MS). Sugar-like compounds were the most abundant component of BBOA, followed by mono-carboxylic acids, aromatic compounds, other oxygenated compounds, and terpenoids. The vast majority of compounds detected in smoke have unknown health impacts. Regression models were trained to predict the saturation vapor pressure and averaged carbon oxidation state (OSc) of detected compounds. The compounds speciated have a wide volatility distribution and most of them are highly oxygenated. In addition, time series of primary BBOA tracers observed in Berkeley were found to be indicative of the types of plants in the ecosystems burned in Napa and Sonoma, and could be used to differentiate the regions from which the smoke must have originated. Commonly used secondary BBOA markers like 4-nitrocatechol were enhanced when plumes aged, but their very fast formation caused them to have similar temporal variation as primary BBOA tracers. Using hierarchical clustering analysis, we classified compounds into seven factors indicative of their sources andtransformation processes, identifying a unique daytime secondary BBOA factor. Chemicals associated with this factor include multifunctional acids and oxygenated aromatic compounds. These compounds have high OSc, and they are also semi-volatile.We observed no net particle-phase organic carbon formation, which indicates an approximate balance between the mass of evaporated organic carbonaceous compounds and the addition of secondary organic carbonaceous compounds. © 2021 EDP Sciences. All rights reserved.
语种	英语
scopus关键词	atmospheric plume; biomass burning; chemical composition; global warming; health impact; molecular analysis; particulate matter; smoke; wildfire; Berkeley; California; San Francisco Bay; United States
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/246974
作者单位	Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, CA 94720, United States; Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States; Department of Civil Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78712, United States; Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Liang Y.,Jen C.N.,Weber R.J.,et al. Chemical composition of PM2.5 in October 2017 Northern California wildfire plumes[J],2021,21(7).
APA	Liang Y.,Jen C.N.,Weber R.J.,Misztal P.K.,&Goldstein A.H..(2021).Chemical composition of PM2.5 in October 2017 Northern California wildfire plumes.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(7).
MLA	Liang Y.,et al."Chemical composition of PM2.5 in October 2017 Northern California wildfire plumes".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.7(2021).