气候变化领域集成服务门户(CCPortal): Source apportionment of VOCs, IVOCs and SVOCs by positive matrixfactorization in suburban Livermore, California

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DOI	10.5194/acp-22-14987-2022
	Source apportionment of VOCs, IVOCs and SVOCs by positive matrixfactorization in suburban Livermore, California
	Wernis, Rebecca A.; Kreisberg, Nathan M.; Weber, Robert J.; Drozd, Greg T.; Goldstein, Allen H.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	14987
结束页码	15019
卷号	22 期号:22 页码:33
英文摘要	Gas- and particle-phase molecular markers provide highly specific information about the sources and atmospheric processes that contribute to air pollution. In urban areas, major sources of pollution are changing as regulation selectively mitigates some pollution sources and climate change impacts the surrounding environment. In this study, a comprehensive thermal desorption aerosol gas chromatograph (cTAG) was used to measure volatile, intermediate-volatility and semivolatile molecular markers every other hour over a 10 d period from 11 to 21 April 2018 in suburban Livermore, California. Source apportionment via positive matrix factorization (PMF) was performed to identify major sources of pollution. The PMF analysis identified 13 components, including emissions from gasoline, consumer products, biomass burning, secondary oxidation, aged regional transport and several factors associated with single compounds or specific events with unique compositions. The gasoline factor had a distinct morning peak in concentration but lacked a corresponding evening peak, suggesting commute-related traffic emissions are dominated by cold starts in residential areas. More monoterpene and monoterpenoid mass was assigned to consumer product emissions than biogenic sources, underscoring the increasing importance of volatile chemical products to urban emissions. Daytime isoprene concentrations were controlled by biogenic sunlight- and temperature-dependent processes, mediated by strong midday mixing, but gasoline was found to be the dominant and likely only source of isoprene at night. Biomass burning markers indicated residential wood burning activity remained an important pollution source even in the springtime. This study demonstrates that specific high-time-resolution molecular marker measurements across a wide range of volatility enable more comprehensive pollution source profiles than a narrower volatility range would allow.
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:000890104300001
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/273288
作者单位	University of California System; University of California Berkeley; University of California System; University of California Berkeley; Colby College
推荐引用方式 GB/T 7714	Wernis, Rebecca A.,Kreisberg, Nathan M.,Weber, Robert J.,et al. Source apportionment of VOCs, IVOCs and SVOCs by positive matrixfactorization in suburban Livermore, California[J],2022,22(22):33.
APA	Wernis, Rebecca A.,Kreisberg, Nathan M.,Weber, Robert J.,Drozd, Greg T.,&Goldstein, Allen H..(2022).Source apportionment of VOCs, IVOCs and SVOCs by positive matrixfactorization in suburban Livermore, California.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(22),33.
MLA	Wernis, Rebecca A.,et al."Source apportionment of VOCs, IVOCs and SVOCs by positive matrixfactorization in suburban Livermore, California".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.22(2022):33.