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Abiotic and biotic control of methanol exchanges in a temperate mixed forest

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Abstract
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 mu g m(-2) s(-1) to 0.6 mu g m(-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 mu g m(-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 mu g m(-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.
Keywords
EDDY COVARIANCE MEASUREMENTS, FLUX MEASUREMENTS, REACTION MASS-SPECTROMETRY, VOLATILE ORGANIC-COMPOUNDS, ATMOSPHERIC METHANOL, PTR-MS, METHYLOBACTERIUM STRAINS, COMPOUND FLUXES, OXYGENATED VOCS, WATER FILMS

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Citation

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MLA
Laffineur, Q., et al. “Abiotic and Biotic Control of Methanol Exchanges in a Temperate Mixed Forest.” ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 12, no. 1, 2012, pp. 577–90.
APA
Laffineur, Q., Aubinet, M., Schoon, N., Amelynck, C., Müller, J.-F., Dewulf, J., … Heinesch, B. (2012). Abiotic and biotic control of methanol exchanges in a temperate mixed forest. ATMOSPHERIC CHEMISTRY AND PHYSICS, 12(1), 577–590.
Chicago author-date
Laffineur, Q, M Aubinet, N Schoon, C Amelynck, J-F Müller, Jo Dewulf, Herman Van Langenhove, Kathy Steppe, and B Heinesch. 2012. “Abiotic and Biotic Control of Methanol Exchanges in a Temperate Mixed Forest.” ATMOSPHERIC CHEMISTRY AND PHYSICS 12 (1): 577–90.
Chicago author-date (all authors)
Laffineur, Q, M Aubinet, N Schoon, C Amelynck, J-F Müller, Jo Dewulf, Herman Van Langenhove, Kathy Steppe, and B Heinesch. 2012. “Abiotic and Biotic Control of Methanol Exchanges in a Temperate Mixed Forest.” ATMOSPHERIC CHEMISTRY AND PHYSICS 12 (1): 577–590.
Vancouver
1.
Laffineur Q, Aubinet M, Schoon N, Amelynck C, Müller J-F, Dewulf J, et al. Abiotic and biotic control of methanol exchanges in a temperate mixed forest. ATMOSPHERIC CHEMISTRY AND PHYSICS. 2012;12(1):577–90.
IEEE
[1]
Q. Laffineur et al., “Abiotic and biotic control of methanol exchanges in a temperate mixed forest,” ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 12, no. 1, pp. 577–590, 2012.
@article{2915198,
  abstract     = {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 mu g m(-2) s(-1) to 0.6 mu g m(-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 mu g m(-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 mu g m(-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.},
  author       = {Laffineur, Q and Aubinet, M and Schoon, N and Amelynck, C and Müller, J-F and Dewulf, Jo and Van Langenhove, Herman and Steppe, Kathy and Heinesch, B},
  issn         = {1680-7316},
  journal      = {ATMOSPHERIC CHEMISTRY AND PHYSICS},
  keywords     = {EDDY COVARIANCE MEASUREMENTS,FLUX MEASUREMENTS,REACTION MASS-SPECTROMETRY,VOLATILE ORGANIC-COMPOUNDS,ATMOSPHERIC METHANOL,PTR-MS,METHYLOBACTERIUM STRAINS,COMPOUND FLUXES,OXYGENATED VOCS,WATER FILMS},
  language     = {eng},
  number       = {1},
  pages        = {577--590},
  title        = {Abiotic and biotic control of methanol exchanges in a temperate mixed forest},
  url          = {http://dx.doi.org/10.5194/acp-12-577-2012},
  volume       = {12},
  year         = {2012},
}

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