气候变化领域集成服务门户(CCPortal): Contributions to local- and regional-scale formaldehyde concentrations

CCPortal

DOI	10.5194/acp-19-8363-2019
	Contributions to local- and regional-scale formaldehyde concentrations
	Bastien L.A.J.; Brown N.J.; Harley R.A.
发表日期	2019
ISSN	16807316
起始页码	8363
结束页码	8381
卷号	19 期号:13
英文摘要	Reducing ambient formaldehyde concentrations is a complex task because formaldehyde is both a primary and a secondary air pollutant, with significant anthropogenic and biogenic sources of volatile organic compound (VOC) precursor emissions. This work uses adjoint sensitivity analysis in a chemical transport model to identify emission sources and chemical reactions that influence formaldehyde mixing ratios in the San Francisco Bay Area and within three urbanized sub-areas. For each of these receptors, the use of the adjoint technique allows for efficient calculation of the sensitivity of formaldehyde to emissions of NOx, formaldehyde, and VOC precursors occurring at any location and time. Formaldehyde mixing ratios are found to be generally higher in summer than in winter. The opposite seasonal trend is observed for the sensitivities of these mixing ratios to formaldehyde emissions. In other words, even though formaldehyde is higher in summer, reducing formaldehyde emissions has a greater impact in winter. In winter, 85 %-90 % of the sensitivity to emissions is attributed to direct formaldehyde emissions. In summer, this contribution is smaller and more variable, ranging from 27 % to 75 % among the receptor areas investigated in this study. Higher relative contributions of secondary formation versus direct emissions are associated with receptors located farther away from heavily urbanized and emission-rich areas. In particular, the relative contribution of biogenic VOC emissions (15 %-43 % in summer) is largest for these receptors. Ethene and other alkenes are the most influential anthropogenic precursors to secondary formaldehyde. Isoprene is the most influential biogenic precursor. Sensitivities of formaldehyde to NOx emissions are generally negative but relatively small in magnitude compared to sensitivities to VOC emissions. The magnitude of anthropogenic emissions of organic compounds other than formaldehyde is found to correlate reasonably well with their influence on population-weighted formaldehyde mixing ratios at the air-basin scale. This correlation does not hold for ambient formaldehyde in smaller urbanized sub-areas. The magnitude of biogenic emissions does not correlate with their influence in either case. © 2019 Author(s).
语种	英语
scopus关键词	anthropogenic source; atmospheric pollution; atmospheric transport; biogenic emission; chemical reaction; concentration (composition); formaldehyde; mixing ratio; nitrogen oxides; seasonal variation; sensitivity analysis; volatile organic compound; 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/144313
作者单位	Department of Civil and Environmental Engineering, University of California at Berkeley, Davis Hall, Berkeley, CA 94720, United States; Energy Analysis and Environmental Impacts Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Bastien L.A.J.,Brown N.J.,Harley R.A.. Contributions to local- and regional-scale formaldehyde concentrations[J],2019,19(13).
APA	Bastien L.A.J.,Brown N.J.,&Harley R.A..(2019).Contributions to local- and regional-scale formaldehyde concentrations.Atmospheric Chemistry and Physics,19(13).
MLA	Bastien L.A.J.,et al."Contributions to local- and regional-scale formaldehyde concentrations".Atmospheric Chemistry and Physics 19.13(2019).