气候变化领域集成服务门户(CCPortal): Wintertime Formaldehyde: Airborne Observations and Source Apportionment Over the Eastern United States

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DOI	10.1029/2020JD033518
	Wintertime Formaldehyde: Airborne Observations and Source Apportionment Over the Eastern United States
	Green J.R.; Fiddler M.N.; Fibiger D.L.; McDuffie E.E.; Aquino J.; Campos T.; Shah V.; Jaeglé L.; Thornton J.A.; DiGangi J.P.; Wolfe G.M.; Bililign S.; Brown S.S.
发表日期	2021
ISSN	2169897X
卷号	126 期号:5
英文摘要	Formaldehyde (HCHO) is generated from direct urban emission sources and secondary production from the photochemical reactions of urban smog. HCHO is linked to tropospheric ozone formation, and contributes to the photochemical reactions of other components of urban smog. In this study, pollution plume intercepts during the Wintertime INvestigation of Transport, Emissions, and Reactivity (WINTER) campaign were used to investigate and characterize the formation of HCHO in relation to several anthropogenic tracers. Analysis of aircraft intercepts combined with detailed chemical box modeling downwind of several cities suggests that the most important contribution to observed HCHO was primary emission. A box model analysis of a single plume suggested that secondary sources contribute to 21 ± 10% of the observed HCHO. Ratios of HCHO/CO observed in the northeast US, from Ohio to New York, ranging from 0.2% to 0.6%, are consistent with direct emissions combined with at most modest photochemical production. Analysis of the nocturnal boundary layer and residual layer from repeated vertical profiling over urban influenced areas indicate a direct HCHO emission flux of 1.3 × 1014 molecules cm−2 h−1. In a case study in Atlanta, GA, nighttime HCHO exhibited a ratio to CO (0.6%–1.8%) and was anti-correlated with O3. Observations were consistent with mixing between direct HCHO emissions in urban air masses with those influenced by more rapid HCHO photochemical production. The HCHO/CO emissions ratios determined from the measured data are 2.3–15 times greater than the NEI 2017 emissions database. The largest observed HCHO/CO was 1.7%–1.8%, located near co-generating power stations. © 2021. The Authors.
英文关键词	Airborne observations; formaldehyde; primary production; secondary production; urban emissions; WINTER
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185425
作者单位	Department of Physics & Applied Sciences and Technology, North Carolina A&T State University, Greensboro, NC, United States; Now at Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel HillNC, United States; NOAA Chemical Sciences Laboratory, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Now at California Air Resources Board, Sacramento, CA, United States; Now at Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, United States; National Center of Atmospheric Research, Boulder, CO, United States; University of Washington, Seattle, WA, United States; NASA Langley Research Center, Hampton, VA, United States; NASA Goddard Space Flight Center, Atmospheric Chemistry and Dynamics Lab, Greenbelt, MD, United States; Joint Center for Earth Systems Technology, University of Maryla...
推荐引用方式 GB/T 7714	Green J.R.,Fiddler M.N.,Fibiger D.L.,et al. Wintertime Formaldehyde: Airborne Observations and Source Apportionment Over the Eastern United States[J],2021,126(5).
APA	Green J.R..,Fiddler M.N..,Fibiger D.L..,McDuffie E.E..,Aquino J..,...&Brown S.S..(2021).Wintertime Formaldehyde: Airborne Observations and Source Apportionment Over the Eastern United States.Journal of Geophysical Research: Atmospheres,126(5).
MLA	Green J.R.,et al."Wintertime Formaldehyde: Airborne Observations and Source Apportionment Over the Eastern United States".Journal of Geophysical Research: Atmospheres 126.5(2021).