Characterization of total ecosystem-scale biogenic VOC exchange at a Mediterranean oak–hornbeam forest

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Schallhart , S , Rantala , P A I , Nemitz , E , Taipale , D , Tillmann , R , Mentel , T F , Loubet , B , Gerosa , G , Finco , A , Rinne , H J I & Ruuskanen , T M 2016 , ' Characterization of total ecosystem-scale biogenic VOC exchange at a Mediterranean oak–hornbeam forest ' , Atmospheric Chemistry and Physics , vol. 16 , pp. 7171-7194 . https://doi.org/10.5194/acpd-15-27627-2015

Title: Characterization of total ecosystem-scale biogenic VOC exchange at a Mediterranean oak–hornbeam forest
Author: Schallhart, Simon; Rantala, Pekka Antti Ilmari; Nemitz, Eiko; Taipale, Ditte; Tillmann, Ralf; Mentel, Thomas F.; Loubet, Benjamin; Gerosa, Giacomo; Finco, Angelo; Rinne, Heikki Janne Ilmari; Ruuskanen, Taina Maria
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Physics
Date: 2016-06-10
Language: eng
Number of pages: 24
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/165000
Abstract: Recently, the number and amount of biogenically emitted volatile organic compounds (VOCs) has been discussed in great detail. Depending on the ecosystem, the published number varies between a dozen and several hundred compounds. We present ecosystem exchange fluxes from a mixed oak-hornbeam forest in the Po Valley, Italy. The fluxes were measured by a proton transfer reaction-time-of-flight (PTR-ToF) mass spectrometer and calculated using the eddy covariance (EC) method. Detectable fluxes were observed for up to 29 compounds, dominated by isoprene, which comprised over 60aEuro-% of the total upward flux (on a molar basis). The daily average of the total VOC upward flux was 10.4aEuro-nmolaEuro-m(-2)aEuro-s(-1). Methanol had the highest concentration and accounted for the largest downward flux. Methanol seemed to be deposited to dew, as the downward flux happened in the early morning, right after the calculated surface temperature came closest to the calculated dew point temperature. We estimated that up to 30aEuro-% of the upward flux of methyl vinyl ketone (MVK) and methacrolein (MACR) originated from atmospheric oxidation of isoprene. A comparison between two methods for the flux detection (manual and automated) was made. Their respective advantages and disadvantages were discussed and the differences in their results shown. Both provide comparable results.
Subject: 114 Physical sciences
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