气候变化领域集成服务门户(CCPortal): Measurement report: Variability in the composition of biogenic volatile organic compounds in a Southeastern US forest and their role in atmospheric reactivity

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DOI	10.5194/acp-21-15755-2021
	Measurement report: Variability in the composition of biogenic volatile organic compounds in a Southeastern US forest and their role in atmospheric reactivity
	Mcglynn D.F.; Barry L.E.R.; Lerdau M.T.; Pusede S.E.; Isaacman-Vanwertz G.
发表日期	2021
ISSN	1680-7316
起始页码	15755
结束页码	15770
卷号	21 期号:20
英文摘要	Despite the significant contribution of biogenic volatile organic compounds (BVOCs) to organic aerosol formation and ozone production and loss, there are few long-term, year-round, ongoing measurements of their volume mixing ratios and quantification of their impacts on atmospheric reactivity. To address this gap, we present 1 year of hourly measurements of chemically resolved BVOCs between 15 September 2019 and 15 September 2020, collected at a research tower in Central Virginia in a mixed forest representative of ecosystems in the Southeastern US. Mixing ratios of isoprene, isoprene oxidation products, monoterpenes, and sesquiterpenes are described and examined for their impact on the hydroxy radical (OH), ozone, and nitrate reactivity. Mixing ratios of isoprene range from negligible in the winter to typical summertime 24gh averages of 4-6gppb, while monoterpenes have more stable mixing ratios in the range of tenths of a part per billion up to g1/42gppb year-round. Sesquiterpenes are typically observed at mixing ratios of <10gppt, but this represents a lower bound in their abundance. In the growing season, isoprene dominates OH reactivity but is less important for ozone and nitrate reactivity. Monoterpenes are the most important BVOCs for ozone and nitrate reactivity throughout the year and for OH reactivity outside of the growing season. To better understand the impact of this compound class on OH, ozone, and nitrate reactivity, the role of individual monoterpenes is examined. Despite the dominant contribution of α-pinene to total monoterpene mass, the average reaction rate of the monoterpene mixture with atmospheric oxidants is between 25g% and 30g% faster than α-pinene due to the contribution of more reactive but less abundant compounds. A majority of reactivity comes from α-pinene and limonene (the most significant low-mixing-ratio, high-reactivity isomer), highlighting the importance of both mixing ratio and structure in assessing atmospheric impacts of emissions. © 2021 Deborah F. McGlynn et al.
语种	英语
scopus关键词	atmospheric chemistry; biogenic emission; forest cover; growing season; measurement method; mixing ratio; monoterpene; nitrate; ozone; reaction rate; volatile organic compound; United States; Virginia; Virginia
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/246480
作者单位	Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, United States; Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, United States; Department of Biology, University of Virginia, Charlottesville, VA 22904, United States
推荐引用方式 GB/T 7714	Mcglynn D.F.,Barry L.E.R.,Lerdau M.T.,et al. Measurement report: Variability in the composition of biogenic volatile organic compounds in a Southeastern US forest and their role in atmospheric reactivity[J],2021,21(20).
APA	Mcglynn D.F.,Barry L.E.R.,Lerdau M.T.,Pusede S.E.,&Isaacman-Vanwertz G..(2021).Measurement report: Variability in the composition of biogenic volatile organic compounds in a Southeastern US forest and their role in atmospheric reactivity.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(20).
MLA	Mcglynn D.F.,et al."Measurement report: Variability in the composition of biogenic volatile organic compounds in a Southeastern US forest and their role in atmospheric reactivity".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.20(2021).