Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere

Show simple item record Rantala, P. Aalto, J. Taipale, R. Ruuskanen, T. M. Rinne, J. 2016-05-11T12:07:01Z 2016-05-11T12:07:01Z 2015
dc.identifier.citation Rantala , P , Aalto , J , Taipale , R , Ruuskanen , T M & Rinne , J 2015 , ' Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere ' , Biogeosciences , vol. 12 , no. 19 , pp. 5753-5770 .
dc.identifier.other PURE: 55052874
dc.identifier.other PURE UUID: 5a0e731c-6cbe-4ef0-9bab-74ed1536bb00
dc.identifier.other WOS: 000362972200013
dc.identifier.other Scopus: 84944044808
dc.identifier.other ORCID: /0000-0002-7243-0611/work/38179331
dc.description.abstract Long-term flux measurements of volatile organic compounds (VOC) over boreal forests are rare, although the forests are known to emit considerable amounts of VOCs into the atmosphere. Thus, we measured fluxes of several VOCs and oxygenated VOCs over a Scots-pine-dominated boreal forest semi-continuously between May 2010 and December 2013. The VOC profiles were obtained with a proton transfer reaction mass spectrometry, and the fluxes were calculated using vertical concentration profiles and the surface layer profile method connected to the Monin-Obukhov similarity theory. In total fluxes that differed significantly from zero on a monthly basis were observed for 13 out of 27 measured masses. Monoterpenes had the highest net emission in all seasons and statistically significant positive fluxes were detected from March until October. Other important compounds emitted were methanol, ethanol+ formic acid, acetone and isoprene+ methylbutenol. Oxygenated VOCs showed also deposition fluxes that were statistically different from zero. Isoprene+ methylbutenol and monoterpene fluxes followed well the traditional isoprene algorithm and the hybrid algorithm, respectively. Emission potentials of monoterpenes were largest in late spring and autumn which was possibly driven by growth processes and decaying of soil litter, respectively. Conversely, largest emission potentials of isoprene+ methylbutenol were found in July. Thus, we concluded that most of the emissions of m/z 69 at the site consisted of isoprene that originated from broadleaved trees. Methanol had deposition fluxes especially before sunrise. This can be connected to water films on surfaces. Based on this assumption, we were able to build an empirical algorithm for bi-directional methanol exchange that described both emission term and deposition term. Methanol emissions were highest in May and June and deposition level increased towards autumn, probably as a result of increasing relative humidity levels leading to predominance of deposition. en
dc.format.extent 18
dc.language.iso eng
dc.relation.ispartof Biogeosciences
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject PTR-MS
dc.subject SCOTS PINE
dc.subject VOC EMISSIONS
dc.subject 114 Physical sciences
dc.subject 1172 Environmental sciences
dc.title Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization INAR Physics
dc.contributor.organization Department of Forest Sciences
dc.contributor.organization The University of Helsinki Centre for Continuing Education
dc.contributor.organization Department of Geosciences and Geography
dc.contributor.organization Ecosystem processes (INAR Forest Sciences)
dc.description.reviewstatus Peer reviewed
dc.relation.issn 1726-4170
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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