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European VOC Emission Estimates Evaluated by Measurements and Model Calculations |
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| Authors: | øystein Hov Asgeir Sorteberg Norbert Schmidbauer Sverre Solberg Frode Stordal David Simpson Anne Lindskog Hans Areskoug Pedro Oyola Heikki Lättilä Niels Z Heidam |
| Institution: | (1) Geophysical Institute, University of Bergen, N-5007 Bergen, Norway;(2) NILU, PO Box 100, N-2007 Kjeller, Norway;(3) DNMI, PO Box 43, N-0113 Oslo, Norway;(4) IVL, Box 47086, S-40258 Gøteborg, Sweden;(5) ITM1, University of Stockholm, S-10691 Stockholm, Sweden;(6) FMI, Sahaajankatu 22E, SF-00810 Helsinki, Finland;(7) DMU, FOLU, Frederiksborgvej 399, DK-4000 Roskilde, Denmark |
| Abstract: | Observations and model calculations of the concentration of hydrocarbonsat five Scandinavian rural sites during March–June 1993are reported.Decreasing concentrations from March to June are observedat all sites. The highest concentrations of hydrocarbons were found in air massescoming in from the southwest to southeast, indicating that long rangetransport fromcontinental Europe and the U.K. is important in pollution episodes. An episode of elevated concentrations of hydrocarbons observed at three of the sites in the middle of Marchis described and discussed in relation to the synoptic situation and thepresenceof other chemical compounds (NO2, PAN, total nitrate andozone).A Lagrangian numerical model is used to calculate the concentrations of theindividual hydrocarbons at the fivesites and comparison with observations is made.The calculated concentrations for nonmethane hydrocarbons with quite longchemicallifetimes agree well with the observations.For the sum of observed and calculated hydrocarbons the correlationcoefficientsare in the range of 0.65–0.88 for the five sitesand the ratio between calculated and measured concentrations was0.72–0.97, indicating thatthe European VOC emission inventory is quite well estimated. |
| Keywords: | volatile hydrocarbons observations and computer modelling tropospheric concentrations long range transport emission validation |
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