Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 10, 4705-4719, 2013
http://www.biogeosciences.net/10/4705/2013/
doi:10.5194/bg-10-4705-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Jul 2013
Terpenoid emissions from fully grown east Siberian Larix cajanderi trees
M. K. Kajos1, H. Hakola2, T. Holst3, T. Nieminen1,4, V. Tarvainen2, T. Maximov5,6, T. Petäjä1, A. Arneth7, and J. Rinne1 1Department of Physics, University of Helsinki, P.O. Box 64, 00014 University of Helsinki, Finland
2Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
3Department of Physical Geography and Ecosystem Science, Lund University, Sölvegatan 12, 22362 Lund, Sweden
4Helsinki Institute of Physics, University of Helsinki, P. O. Box 64, 00014 University of Helsinki, Finland
5Institute for Biological Problems of Cryolithozone SB RAS, 41 Lenin Ave., 677980 Yakutsk, Russia
6North-Eastern Federal University, 58 Belinskogo st., 677000, Yakutsk, Russia
7Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research/Atmospheric Environmental Research, Kreuzeckbahn Str. 19, 82467 Garmisch-Partenkirchen, Germany
Abstract. While emissions of many biogenic volatile organic compounds (BVOCs), such as terpenoids, have been studied quite intensively in North American and Scandinavian boreal forests, the vast Siberian boreal forests have remained largely unexplored by experimental emission studies. In this study the shoot-scale terpenoid emission rates from two mature Larix cajanderi trees growing in their natural habitat in eastern Siberia were measured at the Spasskaya Pad flux measurement site (62°15´18.4" N, 129°37´07.9" E) located on the western bank of the Lena river. The measurements were conducted during three campaigns: 3–24 June, 8–26 July, and 14–30 August, in the summer of 2009. A dynamic flow-through enclosure technique was applied for adsorbent sampling, and the samples were analysed offline with a gas chromatograph. Between 29 and 45 samples were taken from each shoot during all three campaigns. Seven different monoterpenes, six different sesquiterpenes, linalool isoprene, and 2-methyl-3-buten-2-ol (MBO) were identified. The monthly median value of the total terpenoid emissions varied between 0.006 and 10.6 μg gdw−1 h−1. The emissions were dominated by monoterpenes, which constituted between 61 and 92% of the total emissions. About half of the monoterpene emissions were comprised of Δ 3-carene; α- and β-pinene had significant emissions as well. Linalool emissions were also substantial, comprising 3–37% of the total emissions, especially in June. Sesquiterpenes accounted for less than 3% and isoprene less than 1% of the total emissions. Based on the measured emission rates, the relative atmospheric concentration of each compound was estimated. Monoterpenes were the species with the highest relative concentration, while linalool and sesquiterpenes had a notably smaller contribution to the estimated atmospheric concentration than to the emission rates. A temperature-dependent pool algorithm with a constant β (0.09 °C−1 for monoterpenes and 0.143 °C−1 for sesquiterpenes) was used to normalize the measured emission data. For monoterpenes the emission potential varied between 0.5 and 18.5 μg gdw−1 h−1 and for sesquiterpenes between 0.02 and 0.4 μg gdw−1 h−1.

Citation: Kajos, M. K., Hakola, H., Holst, T., Nieminen, T., Tarvainen, V., Maximov, T., Petäjä, T., Arneth, A., and Rinne, J.: Terpenoid emissions from fully grown east Siberian Larix cajanderi trees, Biogeosciences, 10, 4705-4719, doi:10.5194/bg-10-4705-2013, 2013.
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