Modeling speciated terpenoid emissions from the European boreal forest

We present the first estimates of speciated monoterpene emissions from the North European coniferous forests. Measured emission factors and emission p rofiles of boreal tree species (Picea abies, Pinus sylvestris, Betula pendu la, Salix phylicifolia, Populus tremula and Alnus incana) were used togethe r with detailed satellite land cover information and meteorological data in an emission model based on the Guenther emission algorithms. The variation of the coniferous biomass within the boreal region (60 degreesN to 70 degr eesN) was obtained from forest inventory data, and the seasonal variability of the deciduous biomass was taken into account through simple boreal clim atology parameterisation. The annual biogenic emissions in the boreal zone are dominated by coniferous species, but in the summer months, the deciduou s contribution to the monoterpene and isoprene emissions is considerable. N orway spruce (Picea abies) is the most important isoprene emitter in the no rth European boreal forests. The biogenic emission fluxes in the South bore al zone are approximately twice as high as fluxes in the North boreal zone. alpha- and beta -pinene, carene, and cineole are the most abundant emitted terpenes. with a strong contribution of isoprene and linalool during the s ummer months. (C) 2000 Elsevier Science Ltd. All rights reserved.