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@ARTICLE{Acton:278667,
      author       = {Acton, W. J. F. and Schallhart, S. and Langford, B. and
                      Valach, A. and Rantala, P. and Fares, S. and Carriero, G.
                      and Tillmann, R. and Tomlinson, S. J. and Dragosits, U. and
                      Gianelle, D. and Hewitt, C. N. and Nemitz, E.},
      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 / Discussions},
      volume       = {15},
      number       = {20},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-06992},
      pages        = {29213 - 29264},
      year         = {2015},
      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 (PTR-MS) and
                      eddy covariance (PTR-ToF-MS). Isoprene was the dominant
                      emitted compound with a mean day-time 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 MEGAN isoprene emissions
                      algorithms (Guenther et al., 2006). A detailed tree species
                      distribution map for the site enabled the leaf-level
                      emissions of isoprene and monoterpenes recorded using 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},
      doi          = {10.5194/acpd-15-29213-2015},
      url          = {https://juser.fz-juelich.de/record/278667},
}