气候变化领域集成服务门户(CCPortal): Pyruvic acid in the boreal forest: Gas-phase mixing ratios and impact on radical chemistry

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DOI	10.5194/acp-20-3697-2020
	Pyruvic acid in the boreal forest: Gas-phase mixing ratios and impact on radical chemistry
	Eger P.G.; Schuladen J.; Sobanski N.; Fischer H.; Karu E.; Williams J.; Riva M.; Zha Q.; Ehn M.; Quéléver L.L.J.; Schallhart S.; Lelieveld J.; Crowley J.N.
发表日期	2020
ISSN	16807316
起始页码	3697
结束页码	3711
卷号	20 期号:6
英文摘要	Pyruvic acid (CH3C(O)C(O)OH, 2-oxopropanoic acid) is an organic acid of biogenic origin that plays a crucial role in plant metabolism, is present in tropospheric air in both gas-phase and aerosol-phase, and is implicated in the formation of secondary organic aerosols (SOAs). Up to now, only a few field studies have reported mixing ratios of gas-phase pyruvic acid, and its tropospheric sources and sinks are poorly constrained. We present the first measurements of gas-phase pyruvic acid in the boreal forest as part of the IBAIRN (Influence of Biosphere-Atmosphere Interactions on the Reactive Nitrogen budget) field campaign in Hyytiälä, Finland, in September 2016. The mean pyruvic acid mixing ratio during IBAIRN was 96pptv, with a maximum value of 327pptv. From our measurements we estimated the overall pyruvic acid source strength and quantified the contributions of isoprene oxidation and direct emissions from vegetation in this monoterpene-dominated forested environment. Further, we discuss the relevance of gas-phase pyruvic acid for atmospheric chemistry by investigating the impact of its photolysis on acetaldehyde and peroxy radical production rates. Our results show that, based on our present understanding of its photochemistry, pyruvic acid is an important source of acetaldehyde in the boreal environment, exceeding ethane and propane oxidation by factors of ∼10∼20. © 2020 Author(s).
关键词	aerosol atmospheric chemistry biogenic emission boreal forest gas flow isoprene mixing ratio organic acid oxidation photolysis radical troposphere Finland
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132138
推荐引用方式 GB/T 7714	Eger P.G.,Schuladen J.,Sobanski N.,et al. Pyruvic acid in the boreal forest: Gas-phase mixing ratios and impact on radical chemistry[J]. Atmospheric Chemistry and Physics,2020,20(6).
APA	Eger P.G..,Schuladen J..,Sobanski N..,Fischer H..,Karu E..,...&Crowley J.N..(2020).Pyruvic acid in the boreal forest: Gas-phase mixing ratios and impact on radical chemistry.,20(6).
MLA	Eger P.G.,et al."Pyruvic acid in the boreal forest: Gas-phase mixing ratios and impact on radical chemistry".20.6(2020).