Journal article

Turbulent exchange and segregation of HOx radicals and volatile organic compounds above a deciduous forest

Dlugi R, Berger M, Zelger M, Hofzumahaus A, Siese M, Holland F, Wisthaler A, Grabmer W, Hansel A, Koppmann R, Kramm G, Möllmann-Coers M, Knaps A ...see all

Atmospheric Chemistry and Physics, vol. 10, issue 13 (2010) pp. 6215-6235

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Abstract

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 (Emission and CHemical transformation of biogenic volatile Organic compounds) intensive field study in July 2003. The daytime measurements yielded statistically significant OH fluxes directed downward into the direction of the canopy and HO2 fluxes mainly upward out of the canopy. This hints towards a significant local chemical sink of OH by reactions with BVOCs, other organic and inorganic compounds and conversion of OH to HO2 above the canopy. For OH the measured flux is locally balanced by chemical sources and sinks and direct transport of OH plays no important role for the local chemical OH budget at the measurement height, as expected from the short OH lifetime (

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Authors

  • R. Dlugi

  • M. Berger

  • M. Zelger

  • A. Hofzumahaus

  • M. Siese

  • F. Holland

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