Volatile organic compound emissions from Siberian larch |
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| Institution: | 1. Department of Physical Sciences, University of Helsinki, P.O. Box 68, FIN-00014 University of Helsinki, Finland;2. Finnish Meteorological Institute, P.O. Box 503, FIN-00101 Helsinki, Finland;1. School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan;2. Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan;3. Silviculture and Forest Ecological Studies, Hokkaido University, Sapporo, Hokkaido 060-8589, Japan;1. Imec, Kapeldreef 75, B-3001 Leuven, Belgium;2. ESAT-ELECTA, KU-Leuven, Kasteelpark Arenberg 10, B-3001 Leuven, Belgium;3. Kuwait University, College of Engineering and Petroleum, Electrical Engineering Department, Safat 13060, Kuwait;4. University of Debrecen, Faculty of Science and Technology (TTK), Institue of Physics, 4026, Bem square 18/b, Hungary;1. Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, China;2. Dept. of Geological and Mining Engineering and Sciences, Dept. of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI, USA;3. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA;4. School of Environment, Tsinghua University, Beijing 100084, China;1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA;2. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA;2. Forest Science and Technology Center of Catalonia, Ctra. de St. Llorenç de Morunys, km 2, 25280, Solsona, Spain;3. Geography Department, Autonomous University of Barcelona (UAB), B building, UAB Campus 08193, Bellaterra (Cerdanyola del Vallès), Barcelona, Spain;4. Hospital of St. Celoni, St. Celoni, 08470, Barcelona, Spain;5. CREAF, Cerdanyola del Vallès 08193, Barcelona, Catalonia, Spain;6. CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra 08193, Barcelona Catalonia, Spain;7. Chemical Analysis Service, Faculty of Science, Autonomous University of Barcelona (UAB), 08193 Bellaterra (Cerdanyola del Vallès), Barcelona, Spain;8. Institute of Environmental Science and Technology (ICTA), Autonomous University of Barcelona (UAB), Z building, ICTA-ICP, Carrer de les columnes, UAB Campus, 08193, Bellaterra (Cerdanyola del Vallès), Barcelona, Spain |
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| Abstract: | We 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 5.2–21 μg gdw?1 h?1 (using β-value of 0.09 °C?1) for monoterpenes and 0.4–1.8 μg gdw?1 h?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. |
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