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The Mediterranean region is now recognised as one of the major source areas of tropospheric ozone in Europe. The Biogenic Emissions in the Mediterranean Area (BEMA) project is a pan-European programme with the primary aim of quantifying the emission rates of selected reactive trace gases from the vegetation to the atmosphere in the Mediterranean Basin. Within this activity experiments were performed with Mediterranean plant species cultivated in the greenhouse to identify the type and amount of volatile compounds emitted from and stored in the plants. Volatile organics were analysed by gas-chromatographic/mass spectrometric methods. In the case of Quercus ilex it became evident that this evergreen Mediterranean oak is emitting large amounts of monoterpenes, besides isoprene, though having no detectable storage of monoterpenes in leaf or bark. Most abundant are alpha-pinene, sabinene and beta-pinene. Monoterpene emissions are controlled rather by light and physiological activity than by temperature, a pattern that has not yet been reported in literature. The implications of this finding for the calculation of regional or global biogenic emissions are discussed.

Additional information

Authors: STAUDT M, JRC Ispra (IT);SEUFERT G, JRC Ispra (IT);KOTZIAS D, JRC Ispra (IT);SPARTA C, JRC Ispra (IT);CICCIOLI P, CNR, Istituto sull'Inquinamento Atmosferico, Roma (IT)
Bibliographic Reference: Paper presented: 1 Simposio Nazionale sulle Strategie e Tecniche de Monitoraggio, Roma (IT), September 20-22, 1993
Availability: Available from (1) as Paper EN 37852 ORA
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