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DOI	10.1016/j.atmosenv.2020.117803
	Yearlong measurements of monoterpenes and isoprene in a Mediterranean city (Athens): Natural vs anthropogenic origin
	Panopoulou A.; Liakakou E.; Sauvage S.; Gros V.; Locoge N.; Stavroulas I.; Bonsang B.; Gerasopoulos E.; Mihalopoulos N.
发表日期	2020
ISSN	13522310
卷号	243
英文摘要	Monoterpenes and isoprene are important constituents of the volatile organic compounds (VOCs) due to their high reactivity and participation in ozone and secondary aerosol formation. The current work focuses on the results of a 13-month intensive campaign of high resolution time-resolved measurements of these compounds, at an urban background site in Athens, Greece. On an annual basis, monoterpenes (α-pinene and limonene) surpass the isoprene levels presenting mean values of 0.70 ± 0.83 μg m−3, 0.33 ± 0.78 μg m−3 and 0.19 ± 0.36 μg m−3, respectively. The large standard deviation highlights the significant diurnal and day-to-day variability. Isoprene presents a typical seasonal cycle, with a photochemically induced summer-time maximum. Enhanced noon levels are observed during summer, whereas a morning peak in the autumn and winter profiles occurs, despite the generally low levels encountered during these seasons. The monoterpenes deviate from the expected biogenic pattern, presenting higher mean levels during the cold period and a night-to-early morning enhancement strongly related to local anthropogenic tracers such as BC, CO, NO or toluene, as well as increased levels under wind speeds lower than 3 m s−1. Estimations of the anthropogenic and biogenic fractions based on the enhancement ratios of α-pinene versus a variety of anthropogenic tracers, demonstrate a clear dominance of the anthropogenic sources in all studied seasons. Simultaneously, the biogenic fraction increased during summer relative to winter by more than 10 times. Both α-pinene and limonene significantly contribute to locally formed secondary organic aerosol (SOA), determined by means of an ACSM, accounting for at least 22% and 13% of their levels in summer and winter respectively. Additionally, monoterpenes and isoprene contribute 6% to the observed oxidants levels (O3 + NOx) during summer. © 2020 Elsevier Ltd
英文关键词	Athens; Biogenic compounds; Isoprene; Monoterpenes; Volatile organic compounds
语种	英语
scopus关键词	Aerosols; Isoprene; Olefins; Tracers; Urban growth; Volatile organic compounds; Anthropogenic origin; Anthropogenic sources; Day-to-day variability; Enhancement ratios; Mediterranean cities; Secondary aerosols; Secondary organic aerosols; Standard deviation; Monoterpenes; carbon monoxide; isoprene; limonene; monoterpene; nitric oxide; ozone; pinene; toluene; volatile organic compound; aerosol; anthropogenic source; concentration (composition); isoprene; photochemistry; seasonal variation; terpene; tracer; Article; autumn; city; Greece; measurement; meteorology; priority journal; seasonal variation; secondary organic aerosol; summer; wind speed; winter; Greece
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144916
作者单位	University of Crete, Department of Chemistry, Environmental Chemical Processes Laboratory (ECPL), Heraklion, Crete 71003, Greece; IMT Lille Douai, Univ. Lille, SAGE – Département Sciences de L'Atmosphère et Génie de L'Environnement, Lille, 59000, France; National Observatory of Athens, Institute for Environmental Research and Sustainable Development, P. Penteli, Athens, 15236, Greece; LSCE, Laboratoire des Sciences Du Climat et de L'Environnement, Unité Mixte CNRS-CEA-UVSQ, CEA/Orme des Merisiers, Gif-sur-Yvette Cedex, 91191, France
推荐引用方式 GB/T 7714	Panopoulou A.,Liakakou E.,Sauvage S.,et al. Yearlong measurements of monoterpenes and isoprene in a Mediterranean city (Athens): Natural vs anthropogenic origin[J],2020,243.
APA	Panopoulou A..,Liakakou E..,Sauvage S..,Gros V..,Locoge N..,...&Mihalopoulos N..(2020).Yearlong measurements of monoterpenes and isoprene in a Mediterranean city (Athens): Natural vs anthropogenic origin.Atmospheric Environment,243.
MLA	Panopoulou A.,et al."Yearlong measurements of monoterpenes and isoprene in a Mediterranean city (Athens): Natural vs anthropogenic origin".Atmospheric Environment 243(2020).