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Terpenes and their oxidation products in the French Landes forest: insights from Vocus PTR-TOF measurements

dc.rights.licenseopenen_US
dc.contributor.authorLI, Haiyan
hal.structure.identifierIRCELYON-Catalytic and Atmospheric Reactivity for the Environment [CARE]
dc.contributor.authorRIVA, M.
dc.contributor.authorRANTALA, Pekka
dc.contributor.authorHEIKKINEN, Liine
dc.contributor.authorDAELLENBACH, Kaspar
dc.contributor.authorKRECHMER, Jordan
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorFLAUD, Pierre Marie
dc.contributor.authorWORSNOP, Douglas
dc.contributor.authorKULMALA, Markku
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorVILLENAVE, Eric
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPERRAUDIN, Emilie
dc.contributor.authorEHN, Mikael
dc.contributor.authorBIANCHI, Federico
dc.date.accessioned2024-04-10T09:01:48Z
dc.date.available2024-04-10T09:01:48Z
dc.date.issued2020-02-21
dc.identifier.issn1680-7316en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/197399
dc.description.abstractEnThe capabilities of the recently developed Vocus proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF) are reported for the first time based on ambient measurements. With the deployment of the Vocus PTRTOF, we present an overview of the observed gas-phase (oxygenated) molecules in the French Landes forest during summertime 2018 and gain insights into the atmospheric oxidation of terpenes, which are emitted in large quantities in the atmosphere and play important roles in secondary organic aerosol production. Due to the greatly improved detection efficiency compared to conventional PTR instruments, the Vocus PTR-TOF identifies a large number of gas-phase signals with elemental composition categories including CH, CHO, CHN, CHS, CHON, CHOS, and others. Multiple hydrocarbons are detected, with carbon numbers up to 20. Particularly, we report the first direct observations of low-volatility diterpenes in the ambient air. The diurnal cycle of diterpenes is similar to that of monoterpenes and sesquiterpenes but contrary to that of isoprene. Various types of terpene reaction products and intermediates are also characterized. Generally, the more oxidized products from terpene oxidations show a broad peak in the day due to the strong photochemical effects, while the less oxygenated products peak in the early morning and/or in the evening. To evaluate the importance of different formation pathways in terpene chemistry, the reaction rates of terpenes with main oxidants (i.e., hydroxyl radical, OH; ozone, O3; and nitrate radical, NO3) are calculated. For the less oxidized non-nitrate monoterpene oxidation products, their morning and evening peaks have contributions from both O3- and OH-initiated monoterpene oxidation. For the monoterpene-derived organic nitrates, oxidations by O3, OH, and NO3 radicals all contribute to their formation, with their relative roles varying considerably over the course of the day. Through a detailed analysis of terpene chemistry, this study demonstrates the capability of the Vocus PTR-TOF in the detection of a wide range of oxidized reaction products in ambient and remote conditions, which highlights its importance in investigating atmospheric oxidation processes.
dc.description.sponsorshipCOntinental To coastal Ecosystems: evolution, adaptability and governance - ANR-10-LABX-0045en_US
dc.language.isoENen_US
dc.title.enTerpenes and their oxidation products in the French Landes forest: insights from Vocus PTR-TOF measurements
dc.typeArticle de revueen_US
dc.identifier.doi10.5194/acp-20-1941-2020en_US
dc.subject.halChimie/Catalyseen_US
dc.subject.halSciences de l'environnement/Environnement et Sociétéen_US
bordeaux.journalAtmospheric Chemistry and Physicsen_US
bordeaux.page1941-1959en_US
bordeaux.volume20en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue4en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamLPTCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02510668
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BYen_US
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