气候变化领域集成服务门户(CCPortal): Sesquiterpenes dominate monoterpenes in northern wetland emissions

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DOI	10.5194/acp-20-7021-2020
	Sesquiterpenes dominate monoterpenes in northern wetland emissions
	Hellén H.; Schallhart S.; Praplan A.P.; Tykkä T.; Aurela M.; Lohila A.; Lohila A.; Hakola H.
发表日期	2020
ISSN	1680-7316
起始页码	7021
结束页码	7034
卷号	20 期号:11
英文摘要	We have studied biogenic volatile organic compound (BVOC) emissions and their ambient concentrations at a sub-Arctic wetland (Lompolojänkkä, Finland), which is an open, nutrient-rich sedge fen and a part of the Pallas-Sodankylä Global Atmosphere Watch (GAW) station. Measurements were conducted during the growing season in 2018 using an in situ thermal-desorption-gaschromatograph-mass-spectrometer (TD-GC-MS). Earlier studies have shown that isoprene is emitted from boreal wetlands, and it also turned out to be the most abundant compound in the current study. Monoterpene (MT) emissions were generally less than 10 % of the isoprene emissions (mean isoprene emission over the growing season, 44 μg m-2 h-1), but sesquiterpene (SQT) emissions were higher than MT emissions all the time. The main MTs emitted were α-pinene, 1,8-cineol, myrcene, limonene and 3Δ-carene. Of SQTs cadinene, β-cadinene and α-farnesene had the major contribution. During early growing season the SQT=MT emission rate ratio was ~ 10, but it became smaller as summer proceeded, being only ~ 3 in July. Isoprene, MT and SQT emissions were exponentially dependent on temperature (correlation coefficients (R2) 0.75, 0.66 and 0.52, respectively). Isoprene emission rates were also found to be exponentially correlated with the gross primary production of CO2 (R2 D 0:85 in July). Even with the higher emissions from the wetland, ambient air concentrations of isoprene were on average > 100, > 10 and > 6 times lower than MT concentrations in May, June and July, respectively. This indicates that wetland was not the only source affecting atmospheric concentrations at the site, but surrounding coniferous forests, which are high MT emitters, contribute as well. Daily mean MT concentrations had high negative exponential correlation (R2 D 0:96) with daily mean ozone concentrations indicating that vegetation emissions can be a significant chemical sink of ozone in this sub-Arctic area. © Author(s) 2020.
语种	英语
scopus关键词	atmospheric chemistry; biogenic emission; concentration (composition); fen; isoprene; terpene; volatile organic compound; wetland; Finland
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/247715
作者单位	Atmospheric Composition Unit, Finnish Meteorological Institute, P.O. Box 503, Helsinki, 00101, Finland; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Finland
推荐引用方式 GB/T 7714	Hellén H.,Schallhart S.,Praplan A.P.,et al. Sesquiterpenes dominate monoterpenes in northern wetland emissions[J],2020,20(11).
APA	Hellén H..,Schallhart S..,Praplan A.P..,Tykkä T..,Aurela M..,...&Hakola H..(2020).Sesquiterpenes dominate monoterpenes in northern wetland emissions.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(11).
MLA	Hellén H.,et al."Sesquiterpenes dominate monoterpenes in northern wetland emissions".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.11(2020).