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@ARTICLE{Acton:811182,
      author       = {Acton, W. Joe F. and Schallhart, Simon and Langford, Ben
                      and Valach, Amy and Rantala, Pekka and Fares, Silvano and
                      Carriero, Giulia and Tillmann, Ralf and Tomlinson, Sam J.
                      and Dragosits, Ulrike and Gianelle, Damiano and Hewitt, C.
                      Nicholas and Nemitz, Eiko},
      title        = {{C}anopy-scale flux measurements and bottom-up emission
                      estimates of volatile organic compounds from a mixed oak and
                      hornbeam forest in northern {I}taly},
      journal      = {Atmospheric chemistry and physics},
      volume       = {16},
      number       = {11},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-03691},
      pages        = {7149 - 7170},
      year         = {2016},
      abstract     = {This paper reports the fluxes and mixing ratios of
                      biogenically emitted volatile organic compounds (BVOCs)
                      4 m above a mixed oak and hornbeam forest in northern
                      Italy. Fluxes of methanol, acetaldehyde, isoprene, methyl
                      vinyl ketone + methacrolein, methyl ethyl ketone and
                      monoterpenes were obtained using both a
                      proton-transfer-reaction mass spectrometer (PTR-MS) and a
                      proton-transfer-reaction time-of-flight mass spectrometer
                      (PTR-ToF-MS) together with the methods of virtual disjunct
                      eddy covariance (using PTR-MS) and eddy covariance (using
                      PTR-ToF-MS). Isoprene was the dominant emitted compound with
                      a mean daytime flux of 1.9 mg m−2 h−1. Mixing
                      ratios, recorded 4 m above the canopy, were dominated by
                      methanol with a mean value of 6.2 ppbv over the 28-day
                      measurement period. Comparison of isoprene fluxes calculated
                      using the PTR-MS and PTR-ToF-MS showed very good agreement
                      while comparison of the monoterpene fluxes suggested a
                      slight over estimation of the flux by the PTR-MS. A basal
                      isoprene emission rate for the forest of
                      1.7 mg m−2 h−1 was calculated using the Model of
                      Emissions of Gases and Aerosols from Nature (MEGAN) isoprene
                      emission algorithms (Guenther et al., 2006). A detailed
                      tree-species distribution map for the site enabled the
                      leaf-level emission of isoprene and monoterpenes recorded
                      using gas-chromatography mass spectrometry (GC–MS) to be
                      scaled up to produce a bottom-up canopy-scale flux. This was
                      compared with the top-down canopy-scale flux obtained by
                      measurements. For monoterpenes, the two estimates were
                      closely correlated and this correlation improved when the
                      plant-species composition in the individual flux footprint
                      was taken into account. However, the bottom-up approach
                      significantly underestimated the isoprene flux, compared
                      with the top-down measurements, suggesting that the
                      leaf-level measurements were not representative of actual
                      emission rates.},
      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},
      UT           = {WOS:000378354600030},
      doi          = {10.5194/acp-16-7149-2016},
      url          = {https://juser.fz-juelich.de/record/811182},
}