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|Title:||Intra- and Inter-Annual Variability of VOC Emissions From Natural and Semi-natural Vegetation in Europe and Neighbouring Countries|
|Authors:||STEINBRECHER Rainer; SMIATEK Gerhard; SEUFERT GUENTHER; THELOKE Jochen; HAUFF Karin; CICCIOLI Paolo; VAUTARD Robert; CURCI Gabriele; KOEBLE R.|
|Citation:||ATMOSPHERIC ENVIRONMENT vol. 43 no. 7 p. 1380-1391|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Articles in periodicals and books|
|Abstract:||Biogenic VOC emission estimates from the earth surface are a crucial input parameter in air quality models but are still associated with great uncertainties. Increased knowledge accumulated in the last years about BVOC source distribution and chemical compound split of BVOC in Europe combined with a required finer resolution in space and time for predicting regional air pollutant levels forced the set up of a new emission-modelling systems. BVOC emission estimates for the years 1997, 2000, 2001 and 2003 were calculated for EU15, EU27 and all NatAir domain countries with a spatial resolution of 10 by 10 km2 and a temporal resolution of 1 hour. A database was compiled containing latest land and forest distributions, foliar biomass densities, leaf area index (LAI) and plant as well as chemical compound specific emission potentials where available. Meteorological input parameters were obtained using the non-hydrostatic meteorological model MM5. The semi-empirical BVOC model (seBVOC) used considers in addition seasonality of the emission potentials and forest canopy effects. For the Eu27 area BVOC emission amounts to about 12 Mt per year dominated by forest sources with one third coming from other land use. The inter-annual variability is about + 10% considering cold as well as hot years serving as an example for a potential temperature effect on BVOC emissions in the years around 2050. Highest BVOC emissions were observed in July with isoprene, monoterpenes and oxyVOC being emitted in almost equal amounts, with a small fraction of sesquiterpenes (1 to 2%). Highest BVOC flux densities with up to 8 t per km2 and year were reported for Mediterranean countries and Portugal. The new BVOC estimate for Europe and neighbouring countries considerable reduces the bias present in older inventories but overall uncertainty is still a factor of two or larger in particular resulting from not sufficient detailed land cover data and lacking plant species specific emission information in particular for sesquiterpenes and other VOC.|
|JRC Institute:||Sustainable Resources|
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