Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 13 2009 10.5194/acp-9-4207-2009 http://www.atmos-chem-phys.net/9/4207/2009/ http://www.atmos-chem-phys.net/9/4207/2009/acp-9-4207-2009.html http://www.atmos-chem-phys.net/9/4207/2009/acp-9-4207-2009.pdf 4207 4227 2009-07-01 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, Joh.-Joachim-Becher-Weg 27, 55128 Mainz, Germany Research Group Plant and Vegetation Ecology, Department of Biology, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium Department of Environmental Sciences, Wageningen University and Research Centre, Droevendaalsesteeg 4, 6708 PB, Wageningen, The Netherlands Faculty of Chemistry, Houari Boumediene University of Science and Technology, BP 32 El-Alia, Bab-Ezzouar 16111, Algiers Tropical forests are a strong source of biogenic volatile organic compounds (BVOCs) to the atmosphere which can potentially impact the atmospheric oxidation capacity. Here we present airborne and ground-based BVOC measurements representative for the long dry season covering a large area of the northern Amazonian rainforest (6–3° N, 50–59° W). The measurements were conducted during the October 2005 GABRIEL (Guyanas Atmosphere-Biosphere exchange and Radicals Intensive Experiment with the Learjet) campaign. The vertical (35 m to 10 km) and diurnal (09:00–16:00) profiles of isoprene, its oxidation products methacrolein and methyl vinyl ketone and methanol and acetone, measured by PTR-MS (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 5.7 mg isoprene m^−2 h^−1 after compensating for chemistry and ~6.9 mg isoprene m^−2 h^−1 taking detrainment into account. This surface flux is in general agreement with previous tropical forest studies. Inferred methanol and acetone emission fluxes are 0.5 mg methanol m^−2 h^−1 and 0.35 mg acetone m^−2 h^−1, respectively. 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