Reference : Abiotic and biotic control of methanol exchanges in a temperate mixed forest
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/118051
Abiotic and biotic control of methanol exchanges in a temperate mixed forest
English
Laffineur, Quentin mailto [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
Aubinet, Marc mailto [Université de Liège - ULg > 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 mailto [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
11-Jan-2012
Atmospheric Chemistry and Physics
Copernicus Publications
12
577-590
Yes (verified by ORBi)
International
1680-7316
1680-7324
Katlenburg-Lindau
Germany
[en] Methanol ; Forest ; Eddy-covariance
[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.
BELSPO, IMPECVOC, F.R.S.-FNRS
Researchers ; Professionals
http://hdl.handle.net/2268/118051
10.5194/acp-12-577-2012

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