Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-12903-2008 http://www.atmos-chem-phys-discuss.net/8/12903/2008/ http://www.atmos-chem-phys-discuss.net/8/12903/2008/acpd-8-12903-2008.html http://www.atmos-chem-phys-discuss.net/8/12903/2008/acpd-8-12903-2008.pdf 12903 12969 2008-07-08 Flux estimates of isoprene, methanol and acetone from airborne PTR-MS measurements over the tropical rainforest during the GABRIEL 2005 campaign G. Eerdekens williams@mpch-mainz.mpg.de L. Ganzeveld J. Vilà-Guerau de Arellano T. Klüpfel V. Sinha N. Yassaa J. Williams H. Harder D. Kubistin M. Martinez J. Lelieveld Max Planck Institute for Chemistry, Air Chemistry, Mainz, Germany Research Group Plant and Vegetation Ecology, Dept. of Biology, Univ. of Antwerp, Belgium Dept. of Environmental Sciences, Wageningen UR, Wageningen, The Netherlands Faculty of Chemistry, Houari Boumediene Univ. of Science and Technology, Algiers Tropical forests are a strong source of biogenic volatile organic compounds (BVOCs) to the atmosphere and such emissions can impact the atmospheric oxidation capacity. Here we present airborne and ground-based BVOC measurements performed during the long dry season in October 2005 during the GABRIEL (Guyanas Atmosphere-Biosphere exchange and Radicals Intensive Experiment with the Learjet) project, which covered a large area of the northern Amazonian rainforest (6–3° N, 50–59° W). The vertical (35 m to 10 km) and diurnal (09:00–16:00) profiles of selected BVOCs like isoprene, its oxidation products methacrolein and methyl vinyl ketone, methanol and acetone, measured by PTRMS (Proton Transfer Reaction Mass Spectrometry), have been used to empirically estimate their emission fluxes from the forest canopy on a regional scale. The mixed layer isoprene emission flux, inferred from the airborne measurements above 300 m, is 4.1 mg isoprene m^−2 h^−1 whereas the surface flux is 7.3 mg isoprene m^−2 h^−1 after compensating for chemistry. This surface flux is in general agreement with previous tropical forest studies. Mixed layer fluxes of 0.8 mg methanol m^−2 h^−1 and 0.35 mg acetone m^−2 h^−1 were found. The BVOC measurements were compared with fluxes and mixing ratios simulated with a single-column model (SCM). 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