Article (Scientific journals)
Abiotic and biotic control of methanol exchanges in a temperate mixed forest
Laffineur, Quentin; Aubinet, Marc; Schoon, N. et al.
2012In Atmospheric Chemistry and Physics, 12, p. 577-590
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Keywords :
Methanol; Forest; Eddy-covariance
Abstract :
[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
Publication date :
11 January 2012
Journal title :
Atmospheric Chemistry and Physics
ISSN :
1680-7316
eISSN :
1680-7324
Publisher :
Copernicus Publications, Katlenburg-Lindau, Germany
Volume :
12
Pages :
577-590
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO, IMPECVOC, F.R.S.-FNRS
Available on ORBi :
since 27 April 2012

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