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

Schallhart, Simon; Rantala, Pekka; Nemitz, Eiko; Taipale, Ditte; Tillmann, Ralf; Mentel, Ralf; Loubet, Benjamin; Gerosa, Giacomo; Finco, Angelo and Rinne, Janne LU , et al. (2016) In Atmospheric Chemistry and Physics 16(11). p.7171-7194
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 60 % of the total upward flux (on a molar basis). The daily average of the total VOC upward flux was 10.4 nmol m−2 s−1. Methanol had the highest concentration and accounted... (More)
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 60 % of the total upward flux (on a molar basis). The daily average of the total VOC upward flux was 10.4 nmol m−2 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 30 % 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. (Less)
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Atmospheric Chemistry and Physics
volume
16
issue
11
pages
24 pages
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • scopus:84974622386
  • wos:000378354600031
ISSN
1680-7324
DOI
10.5194/acp-16-7171-2016
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English
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yes
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30664d4b-f72c-455e-8955-ecf7786d8132
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2016-10-07 13:53:07
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2017-09-18 11:30:52
@article{30664d4b-f72c-455e-8955-ecf7786d8132,
  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 60 % of the total upward flux (on a molar basis). The daily average of the total VOC upward flux was 10.4 nmol m−2 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.<br/><br/>We estimated that up to 30 % 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.},
  author       = {Schallhart, Simon and Rantala, Pekka and Nemitz, Eiko and Taipale, Ditte and Tillmann, Ralf and Mentel, Ralf and Loubet, Benjamin and Gerosa, Giacomo and Finco, Angelo and Rinne, Janne and Ruuskanen, Taina},
  issn         = {1680-7324},
  language     = {eng},
  number       = {11},
  pages        = {7171--7194},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Characterization of total ecosystem-scale biogenic VOC exchange at a Mediterranean oak–hornbeam forest},
  url          = {http://dx.doi.org/10.5194/acp-16-7171-2016},
  volume       = {16},
  year         = {2016},
}