Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 6 2009 10.5194/acpd-9-24423-2009 http://www.atmos-chem-phys-discuss.net/9/24423/2009/ http://www.atmos-chem-phys-discuss.net/9/24423/2009/acpd-9-24423-2009.html http://www.atmos-chem-phys-discuss.net/9/24423/2009/acpd-9-24423-2009.pdf 24423 24476 2009-11-16 Turbulent exchange and segregation of HO_x radicals and volatile organic compounds above a deciduous forest R. Dlugi rdlugi@gmx.de M. Berger M. Zelger A. Hofzumahaus M. Siese F. Holland A. Wisthaler W. Grabmer A. Hansel R. Koppmann G. Kramm M. Möllmann-Coers A. Knaps Arbeitsgruppe Atmosphärische Prozesse (AGAP), München, Germany Institut für Chemie und Dynamik der Geosphäre 2 (ICG-2): Troposphäre, Forschungszentrum Jülich, Jülich, Germany Leopold Franzens – Universität, Institut für Ionenphysik und Angewandte Physik (IAP), Innsbruck, Austria Fachgruppe Physik, Fachbereich Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Wuppertal, Germany Geophysical Institute, University of Alaska, Fairbanks, USA Geschäftsbereich Sicherheit, Forschungszentrum Jülich, Jülich, Germany The eddy covariance method was applied for the first time to estimate fluxes of OH and HO₂ together with fluxes of isoprene, the sum of methyl vinyl ketone (MVK) and methacrolein (MACR) and the sum of monoterpenes above a mixed deciduous forest. Highly sensitive measurements of OH and HO₂ were performed by laser induced fluorescence (LIF), and biogenic volatile organic compounds (BVOCs) were measured by Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) at a time resolution of 5 s, each. Wind speed was measured by a sonic anemometer at 10 Hz. The one-day feasibility study was conducted at a total height of 37 m, about 7 m above forest canopy, during the ECHO 2003 intensive field study in July 2003. The daytime measurements yielded statistically significant OH fluxes that indicate downward transport of OH into the direction of the canopy and HO₂ fluxes mainly upward out of the canopy. This hints towards a significant chemical sink of OH by reaction with BVOCs and conversion of OH to HO₂ at the canopy. 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