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@ARTICLE{Schallhart:278669,
      author       = {Schallhart, S. and Rantala, P. and Nemitz, E. and Mogensen,
                      D. and Tillmann, R. and Mentel, T. F. and Rinne, J. and
                      Ruuskanen, T. M.},
      title        = {{C}haracterization of total ecosystem scale biogenic {VOC}
                      exchange at a {M}editerranean oak-hornbeam forest},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {15},
      number       = {19},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-06994},
      pages        = {27627 - 27673},
      year         = {2015},
      abstract     = {Recently, the number and amount of biogenically emitted
                      volatile organic compounds (VOCs) has been discussed
                      vigorously. 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 by the eddy covariance (EC)
                      method. Detectable fluxes were observed for twelve
                      compounds, dominated by isoprene, which comprised over 65
                      $\%$ of the total flux emission. The daily average of the
                      total VOC emission was 9.5 nmol m-2 s-1. Methanol had the
                      highest concentration and accounted for the largest
                      deposition. Methanol seemed to be deposited to dew, as the
                      deposition happened in the early morning, right after the
                      calculated surface temperature came closest to the
                      calculated dew point temperature.We estimated that up to 27
                      $\%$ of the upward flux of methyl vinyl ketone (MVK) and
                      methacrolein (MACR) originated from atmospheric oxidation of
                      isoprene. A comparison between two flux detection methods
                      (classical/visual and automated) was made. Their respective
                      advantages and disadvantages were discussed and the
                      differences in their results shown. Both provide comparable
                      results; however we recommend the automated method with a
                      compound filter, which combines the fast analysis and better
                      flux detection, without the overestimation due to double
                      counting.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-15-27627-2015},
      url          = {https://juser.fz-juelich.de/record/278669},
}