Temporal variation of VOC fluxes measured with PTR-TOF above a boreal forest

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http://hdl.handle.net/10138/232122

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Schallhart , S , Rantala , P A I , Kajos , M K , Aalto , J A , Mammarella , I , Ruuskanen , T M & Kulmala , M T 2018 , ' Temporal variation of VOC fluxes measured with PTR-TOF above a boreal forest ' , Atmospheric Chemistry and Physics , vol. 18 , no. 2 , pp. 815-832 . https://doi.org/10.5194/acp-18-815-2018

Title: Temporal variation of VOC fluxes measured with PTR-TOF above a boreal forest
Author: Schallhart, Simon; Rantala, Pekka Antti Ilmari; Kajos, Maija Karoliina; Aalto, Juho Antton; Mammarella, Ivan; Ruuskanen, Taina Maria; Kulmala, Markku Tapio
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-01-23
Language: eng
Number of pages: 18
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/232122
Abstract: Between April and June 2013 fluxes of volatile organic compounds (VOCs) were measured in a Scots pine and Norway spruce forest using the eddy covariance (EC) method with a proton transfer reaction time-of-flight (PTR-TOF) mass spectrometer. The observations were performed above a boreal forest at the SMEAR II site in southern Finland. We found a total of 25 different compounds with exchange and investigated their seasonal variations from spring to summer. The majority of the net VOC flux was comprised of methanol, monoterpenes, acetone and butene + butanol. The butene + butanol emissions were concluded to not originate from the forest and, therefore, be anthropogenic. The VOC exchange followed a seasonal trend and the emissions increased from spring to summer. Only three compounds were emitted during the snowmelt while in summer emissions of some 19 VOCs were observed. During the measurement period in April, the emissions were dominated by butene + butanol, while during the start of the growing season and in summer, methanol was the most emitted compound. The main source of methanol was likely the growth of new biomass. During a 21-day period in June, the net VOC flux was 2.1 nmolm 2 s(-1). This is on the lower end of PTR-TOF flux measurements from other ecosystems, which range from 2 to 10 nmolm 2 s(-1). The EC flux results were compared with surface layer profile measurements, using a proton transfer reaction quadrupole mass spectrometer, which is perman
Subject: 114 Physical sciences
4112 Forestry
VOLATILE ORGANIC-COMPOUNDS
PROTON-TRANSFER-REACTION
SCOTS PINE FOREST
SCALE MONOTERPENE EMISSIONS
EDDY-COVARIANCE
SEASONAL-VARIATION
MS MEASUREMENTS
DE-NOVO
GC-MS
ATMOSPHERE
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