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Methanol Exchange Between Grassland and the Atmosphere : Volume 4, Issue 3 (26/06/2007)

By Brunner, A.

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Book Id: WPLBN0003992745
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Methanol Exchange Between Grassland and the Atmosphere : Volume 4, Issue 3 (26/06/2007)  
Author: Brunner, A.
Volume: Vol. 4, Issue 3
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description: Agroscope Reckenholz-Tänikon Research Station ART, Reckenholzstrasse 191, 8037 Zürich, Switzerland. Concentrations and fluxes of methanol were measured above two differently managed grassland fields (intensive and extensive) in central Switzerland during summer 2004. The measurements were performed with a proton-transfer-reaction mass-spectrometer and fluxes were determined by the eddy covariance method. The observed methanol emission showed a distinct diurnal cycle and was strongly correlated with global radiation and water vapour flux. Mean and maximum daily emissions were found to depend on grassland species composition and, for the intensive field, also on the growing state. The extensive field with a more complex species composition had higher emissions than the graminoid-dominated intensive field, both on an area and on a biomass basis. A simple parameterisation depending on the water vapour flux and the leaf area index allowed a satisfying simulation of the temporal variation of methanol emissions over the growing phase. Accumulated carbon losses due to methanol emissions accounted for 0.024 and 0.048% of net primary productivity for the intensive and extensive field, respectively. The integral methanol emissions over the growing periods were more than one order of magnitude higher than the emissions related to cut and drying events.

Methanol exchange between grassland and the atmosphere

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