[en] Methanol exchanges over a mixed temperate forest in the Belgian Ardennes were measured for more than one vegetation season using disjunct eddy-covariance by a mass scanning technique and Proton Transfer Reaction Mass Spectrometry (PTR-MS). Half-hourly methanol fluxes were measured in the range of −0.6 μgm−2 s−1 to 0.6 μgm−2 s−1, and net daily methanol fluxes were generally negative in summer and autumn and positive in spring. On average, the negative fluxes dominated (i.e. the site behaved as a net sink), in contrast to what had been found in previous studies.
An original model describing the adsorption/desorption of methanol in water films present in the forest ecosystem and the methanol degradation process was developed. Its calibration, based on field measurements, predicted a mean methanol degradation rate of −0.0074 μgm−2 s−1 and a half lifetime for methanol in water films of 57.4 h. Biogenic emissions dominated the exchange only in spring, with a standard emission factor of 0.76 μgm−2 s−1.
The great ability of the model to reproduce the long-term evolution, as well as the diurnal variation of the fluxes, suggests that the adsorption/desorption and degradation processes
play an important role in the global methanol budget. This result underlines the need to conduct long-term measurements in order to accurately capture these processes and to better estimate methanol fluxes at the ecosystem scale.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Laffineur, Quentin ; Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Aubinet, Marc ; Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Schoon, N.; Belgian Institute for Space Aeronomy
Amelynck, C.; Belgian Institute for Space Aeronomy
Müller, J.-F.; Belgian Institute for Space Aeronomy
Dewulf, J.; Faculty of Bioscience Engineering, Ghent Univeristy
Van Langenhove, H.; Faculty of Bioscience Engineering, Ghent Univeristy
Steppe, K.; Faculty of Bioscience Engineering, Ghent Univeristy > Laboratory of Plant Ecology
Heinesch, Bernard ; Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Language :
English
Title :
Abiotic and biotic control of methanol exchanges in a temperate mixed forest
BELSPO - Belgian Science Policy Office F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
This work was supported financially by the
Belgian Science Policy Office (BELSPO) (contract number
SD/TE/03A) for funding the IMPECVOC (Impact of Phenology
and Environmental Conditions on BVOC Emissions from Forest
Ecosystems) research project, and by the Fonds National de la
Recherche Scientifique (FNRS) (contract number 2.4.575.08F) for
the building of a new flux tower in Vielsalm.
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