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| Titel |
Oxygenated VOC and monoterpene emissions from a boreal coniferous forest |
| VerfasserIn |
R. Taipale, P. Rantala, M. K. Kajos, J. Patokoski, T. M. Ruuskanen, J. Aalto, P. Kolari, J. Bäck, P. Hari, M. Kulmala  , J. Rinne |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067409
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| Zusammenfassung |
| Compared with terpenoids, emissions of oxygenated volatile organic compounds (VOCs)
from boreal ecosystems have been poorly characterized. We measured ecosystem scale
emissions of three oxygenated compounds (methanol, acetaldehyde, and acetone) and
monoterpenes from a Scots pine dominated forest in southern Finland during the summers
2006–2008. The measurements were conducted using the disjunct eddy covariance method
combined with proton transfer reaction mass spectrometry. The contribution of the three
oxygenated compounds to the measured total emissions was 40–60Â %. The highest
oxygenated VOC emissions were those of methanol, comprising 20–30Â % of the total,
followed by acetone with a share of 10–20 %. The acetaldehyde emissions were 5–10 % of
the total. This emission composition will be compared with that obtained from shoot
enclosure measurements. Methanol showed deposition during some periods although its
overall flux was towards the atmosphere. The monoterpene emissions had a light
dependent component, suggesting that part of the emissions originated directly
from monoterpene biosynthesis. Diurnal, seasonal, and inter-annual variations in
the emissions, along with temperature and light dependencies, will be discussed. |
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