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Volatile organic compound emissions from Siberian larch
AbstractWe determined hourly emissions of isoprene, monoterpenes and sesquiterpenes from Siberian larch, one of the major tree species in Siberian forests. Summer volatile organic compounds (VOCs) emission from Siberian larch consisted mainly of monoterpenes (about 90%). The monoterpene emission spectrum remained constant during the measurement period, almost half was sabinene and other major monoterpenes were Δ3-carene, β- and α-pinene. During spring and summer, about 10% of the VOCs were sesquiterpenes, mainly α-farnesene. The sesquiterpene emissions declined to 3% in the fall. Isoprene, 2-methyl-3-buten-2-ol (MBO) and 1,8-cineole contributed to less than 3% of the VOC emission during the whole period. The diurnal variation of the emissions could be explained using a temperature-dependent parameterization. Emission potentials normalized to 30°C were 5.2–21μggdw−1h−1 (using β-value of 0.09°C−1) for monoterpenes and 0.4–1.8μggdw−1h−1 (using β-value of 0.143°C−1, mean of determined values) for sesquiterpenes. Normalized monoterpene emission potentials were highest in late summer and elevated again in late fall. Sesquiterpene emission potentials were also highest in late summer, but decreased towards fall.
Volatile organic compound emissions from Siberian larch
AbstractWe determined hourly emissions of isoprene, monoterpenes and sesquiterpenes from Siberian larch, one of the major tree species in Siberian forests. Summer volatile organic compounds (VOCs) emission from Siberian larch consisted mainly of monoterpenes (about 90%). The monoterpene emission spectrum remained constant during the measurement period, almost half was sabinene and other major monoterpenes were Δ3-carene, β- and α-pinene. During spring and summer, about 10% of the VOCs were sesquiterpenes, mainly α-farnesene. The sesquiterpene emissions declined to 3% in the fall. Isoprene, 2-methyl-3-buten-2-ol (MBO) and 1,8-cineole contributed to less than 3% of the VOC emission during the whole period. The diurnal variation of the emissions could be explained using a temperature-dependent parameterization. Emission potentials normalized to 30°C were 5.2–21μggdw−1h−1 (using β-value of 0.09°C−1) for monoterpenes and 0.4–1.8μggdw−1h−1 (using β-value of 0.143°C−1, mean of determined values) for sesquiterpenes. Normalized monoterpene emission potentials were highest in late summer and elevated again in late fall. Sesquiterpene emission potentials were also highest in late summer, but decreased towards fall.
Volatile organic compound emissions from Siberian larch
Ruuskanen, T.M. (author) / Hakola, H. (author) / Kajos, M.K. (author) / Hellén, H. (author) / Tarvainen, V. (author) / Rinne, J. (author)
Atmospheric Environment ; 41 ; 5807-5812
2007-05-22
6 pages
Article (Journal)
Electronic Resource
English
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