Author/Authors :
Martin Graus، نويسنده , , Armin Hansel، نويسنده , , Armin Wisthaler، نويسنده , , Christian Lindinger، نويسنده , , RENATE FORKEL، نويسنده , , Karin Hauff، نويسنده , , Matthias Klauer، نويسنده , , Andreas Pfichner، نويسنده , , Bernhard Rappengluck، نويسنده , , Dominik Steigner، نويسنده , , Rainer Steinbrecher، نويسنده ,
Abstract :
A relaxed-eddy-accumulation set-up using an online gas-chromatographic technique and proton-transfer-reaction mass spectrometry was applied to determine isoprenoid fluxes above a Norway spruce forest in July 2001/2002. The system was quality assured and its suitability for determination of canopy fluxes of isoprenoids was demonstrated. Flux measurements of oxygenated hydrocarbons failed the data quality check due to artefacts presumably arising from line and ozone-scrubber effects. Observations of turbulent fluxes of isoprenoids during the two field experiments show good agreements with primary flux data derived from enclosure measurements and modelling results using a canopy-chemistry emission model (CACHE). For monoterpenes maximum daytime fluxes of more than were observed, isoprene fluxes reached 1– .
Keywords :
Norway spruce , Biogenic volatile organic compounds (BVOC) , Proton-transfer-reaction-mass spectrometry (PTR-MS) , Relaxed-eddyaccumulation(REA) , Fluxes
