气候变化领域集成服务门户(CCPortal): Measurement report: Molecular composition and volatility of gaseous organic compounds in a boreal forest - From volatile organic compounds to highly oxygenated organic molecules

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DOI	10.5194/acp-21-8961-2021
	Measurement report: Molecular composition and volatility of gaseous organic compounds in a boreal forest - From volatile organic compounds to highly oxygenated organic molecules
	Huang W.; Li H.; Sarnela N.; Heikkinen L.; Tham Y.J.; Mikkilä J.; Thomas S.J.; Donahue N.M.; Kulmala M.; Bianchi F.
发表日期	2021
ISSN	1680-7316
起始页码	8961
结束页码	8977
卷号	21 期号:11
英文摘要	The molecular composition and volatility of gaseous organic compounds were investigated during April-July 2019 at the Station for Measuring Ecosystem - Atmosphere Relations (SMEAR) II situated in a boreal forest in Hyytiälä, southern Finland. In order to obtain a more complete picture and full understanding of the molecular composition and volatility of ambient gaseous organic compounds (from volatile organic compounds, VOCs, to highly oxygenated organic molecules, HOMs), two different instruments were used. A Vocus proton-transfer-reaction time-of-flight mass spectrometer (Vocus PTR-ToF; hereafter Vocus) was deployed to measure VOCs and less oxygenated VOCs (i.e., OVOCs). In addition, a multi-scheme chemical ionization inlet coupled to an atmospheric pressure interface time-of-flight mass spectrometer (MION API-ToF) was used to detect less oxygenated VOCs (using Br- as the reagent ion; hereafter MION-Br) and more oxygenated VOCs (including HOMs; using NO3- as the reagent ion; hereafter MION-NO3). The comparison among different measurement techniques revealed that the highest elemental oxygen-to-carbon ratios (Oĝ:ĝC) of organic compounds were observed by the MION-NO3 (0.9ĝ±ĝ0.1, averageĝ±ĝ1 standard deviation), followed by the MION-Br (0.8ĝ±ĝ0.1); lowest Oĝ:ĝC ratios were observed by Vocus (0.2ĝ±ĝ0.1). Diurnal patterns of the measured organic compounds were found to vary among different measurement techniques, even for compounds with the same molecular formula, suggesting contributions of different isomers detected by the different techniques and/or fragmentation from different parent compounds inside the instruments. Based on the complementary molecular information obtained from Vocus, MION-Br, and MION-NO3, a more complete picture of the bulk volatility of all measured organic compounds in this boreal forest was obtained. As expected, the VOC class was the most abundant (about 53.2ĝ%), followed by intermediate-volatility organic compounds (IVOCs, about 45.9ĝ%). Although condensable organic compounds (low-volatility organic compounds, LVOCs; extremely low volatility organic compounds, ELVOCs; and ultralow-volatility organic compounds, ULVOCs) only comprised about 0.2ĝ% of the total gaseous organic compounds, they play an important role in new particle formation as shown in previous studies in this boreal forest. Our study shows the full characterization of the gaseous organic compounds in the boreal forest and the advantages of combining Vocus and MION API-ToF for measuring ambient organic compounds with different oxidation extents (from VOCs to HOMs). The results therefore provide a more comprehensive understanding of the molecular composition and volatility of atmospheric organic compounds as well as new insights into interpreting ambient measurements or testing/improving parameterizations in transport and climate models. © Copyright:
语种	英语
scopus关键词	atmospheric chemistry; atmospheric pressure; boreal forest; climate modeling; fragmentation; mass spectrometry; organic compound; oxidation; parameterization; volatile organic compound; Finland; Hyytiala; Pirkanmaa
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/246812
作者单位	Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland; School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, 518055, China; Karsa Oy., A. I. Virtasen aukio 1, Helsinki, 00560, Finland; Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, United States
推荐引用方式 GB/T 7714	Huang W.,Li H.,Sarnela N.,et al. Measurement report: Molecular composition and volatility of gaseous organic compounds in a boreal forest - From volatile organic compounds to highly oxygenated organic molecules[J],2021,21(11).
APA	Huang W..,Li H..,Sarnela N..,Heikkinen L..,Tham Y.J..,...&Bianchi F..(2021).Measurement report: Molecular composition and volatility of gaseous organic compounds in a boreal forest - From volatile organic compounds to highly oxygenated organic molecules.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Huang W.,et al."Measurement report: Molecular composition and volatility of gaseous organic compounds in a boreal forest - From volatile organic compounds to highly oxygenated organic molecules".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).