Abstract
The present work, carried out as part of the European fiEld experimentS to COnstrain Models of atmospheric Pollution and Transport of Emissions project (ESCOMPTE), brings a new contribution to the inventory of the main natural hydrocarbons sources that are liable to participate in the production of ozone. The measurement campaign was conducted in Montmeyan, a site close to Marseilles (France), with the aim of quantifying the terpenic emission pattern and the behaviour of Quercus pubescens, an important Mediterranean tree species. Biogenic emissions by Q. pubescens were determined by the enclosure of an intact branch of this tree in a Teflon cuvette. The total monoterpenic emission rates thus recorded were found to reach maximum values ranged between 40 and 350 μg g Dry Weight −1 h −1. Emissions were correlated strongly with leaf temperature and Photosynthetic Active Radiation (PAR). The fluxes were also determined by extrapolating the results of the enclosure method and by using aerodynamic gradient method. They reach around 73 mg m −2 h −1 with the first method and 55 mg m −2 h −1 with the second one. The obtained values fit with a maximal ratio of 2.
Highlights
Many volatile organic compounds (VOCs) are emitted from vegetation
Emission rates measurements from cuvette Two cuvettes were mounted side by side at a height of 10 m on a scaffold erected in the vicinity of Q. pubescens
The main terpens emitted by Q. pubescens and identified in the cuvette are: isoprene, alpha-pinene, beta-pinene, sabinene, D3-carene, myrcene, limonene and 1.8-cineole
Summary
The nature and intensity of terpenic emissions vary according to the vegetal species. Such emissions depend on the vegetal physiological activity, leaves temperature and PAR (Yokouchi and Ambe, 1984; Steinbrecher et al, 1991; Simon et al, 1994; Staudt and Seufert, 1995; Kesselmeier et al, 1997; Schuh et al, 1997; Kim, 2001; Sabillon and Cremades, 2001; Shao et al, 2001). The aim of the project is the physicochemical modeling of the local tropospheric processes This point requires the establishment of emission inventories in particular concerning the biogenic emissions by the vegetable sources. Quercus pubescens was studied because of its large coverage (first for the forest occupation percentage) (www.ifn.fr) and its high isoprene emission potential
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