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www.biogeosciences-discuss.net/6/2183/2009/
doi:10.5194/bgd-6-2183-2009
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Concentrations and fluxes of biogenic volatile organic compounds above a Mediterranean macchia ecosystem in Western Italy
1Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
2University of Helsinki, Department of Physics, P.O. Box 68, 00014 Helsinki, Finland
3Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK
4School of Chemistry, University of Edinburgh, Edinburgh EH9 3JJ, UK
5National Research Council, Institute of Agro-environmental and Forest Biology, Via Salaria km. 29 300, 00016 Monterotondo Scalo (Rome), Italy
*now at: University of California, Department of Environmental Science, Policy, and Management, 137 Mulford Hall, Berkeley, CA 94720, USA
Abstract. Emission rates and concentrations of biogenic volatile organic compounds (BVOCs) were measured at a Mediterranean coastal site at Castelporziano, approximately 25 km south-west of Rome, between 7 May and 3 June 2007, as part of the ACCENT-VOCBAS field campaign on biosphere-atmosphere interactions. Concentrations and emission rates were measured using the disjunct eddy covariance method utilizing three different proton transfer reaction mass spectrometers (PTR-MS) for BVOC mixing ratio measurements and sonic anemometers for three-dimensional high-frequency wind measurements. Depending on the measurement period and the instrument, the median volume mixing ratios were 1.6–3.5 ppbv for methanol, 0.4–1.5 ppbv for acetaldehyde, 1.0–2.5 ppbv for acetone, 0.10–0.17 ppbv for isoprene, and 0.18–0.30 ppbv for monoterpenes. A diurnal cycle in mixing ratios was apparent with daytime maxima for methanol, acetaldehyde, acetone, and isoprene. The median fluxes were 370–440 μg m−2 h−1 for methanol, 180–360 μg m−2 h−1 for acetaldehyde, 180–450 μg m−2 h−1 for acetone, 71–290 μg m−2 h−1 for isoprene, and 240–860 μg m−2 h−1 for monoterpenes.
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Citation: Davison, B., Taipale, R., Langford, B., Misztal, P., Fares, S., Matteucci, G., Loreto, F., Cape, J. N., Rinne, J., and Hewitt, C. N.: Concentrations and fluxes of biogenic volatile organic compounds above a Mediterranean macchia ecosystem in Western Italy, Biogeosciences Discuss., 6, 2183-2216, doi:10.5194/bgd-6-2183-2009, 2009. Bibtex EndNote Reference Manager XML
