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@ARTICLE{Spirig:44372,
      author       = {Spirig, C. and Neftel, A. and Ammann, C. and Dommen, G. Di.
                      and Grabmer, W. and Thielmann, A. and Schaub, A. and
                      Beauchamp, J. and Wisthaler, A. and Hansel, A.},
      title        = {{E}ddy covariance flux measurements of biogenic {VOC}s
                      during {ECHO} 2003 using proton transfer reaction mass
                      spectrometry},
      journal      = {Atmospheric chemistry and physics},
      volume       = {5},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-44372},
      pages        = {465 - 481},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Within the framework of the AFO 2000 project ECHO, two
                      PTR-MS instruments were operated in combination with sonic
                      anemometers to determine biogenic VOC fluxes from a mixed
                      deciduous forest site in North-Western Germany. The
                      measurement site was characterised by a forest of
                      inhomogeneous composition, complex canopy structure, limited
                      extension in certain wind directions and frequent calm wind
                      conditions during night time. The eddy covariance (EC)
                      technique was applied since it represents the most direct
                      flux measurement approach on the canopy scale and is,
                      therefore, least susceptible to these non-ideal conditions.
                      A specific flux calculation method was used to account for
                      the sequential multi-component PTR-MS measurements and
                      allowing an individual delay time adjustment as well as a
                      rigorous quality control based on cospectral analysis. The
                      validated flux results are consistent with light and
                      temperature dependent emissions of isoprene and monoterpenes
                      from this forest, with average daytime emissions of 0.94 and
                      0.3 mug m(-2) s(-1), respectively. Emissions of methanol
                      reached on average 0.087 mug m(-2) s(-1) during daytime, but
                      fluxes were too small to be detected during night time.
                      Upward fluxes of the isoprene oxidation products methyl
                      vinyl ketone (MVK) and methacrolein (MACR) were also found,
                      being two orders of magnitude lower than those of isoprene.
                      Calculations with an analytical footprint model indicate
                      that the observed isoprene fluxes correlate with the
                      fraction of oaks within the footprints of the flux
                      measurement.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000226995100001},
      url          = {https://juser.fz-juelich.de/record/44372},
}