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@ARTICLE{Reitz:907699,
      author       = {Reitz, Oliver and Graf, Alexander and Schmidt, Marius and
                      Ketzler, Gunnar and Leuchner, Michael},
      title        = {{E}ffects of {M}easurement {H}eight and
                      {L}ow-{P}ass-{F}iltering {C}orrections on
                      {E}ddy-{C}ovariance {F}lux {M}easurements {O}ver a {F}orest
                      {C}learing with {C}omplex {V}egetation},
      journal      = {Boundary layer meteorology},
      volume       = {184},
      issn         = {0006-8314},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {FZJ-2022-02167},
      pages        = {277-299},
      year         = {2022},
      abstract     = {Flux measurements over heterogeneous surfaces with growing
                      vegetation and a limited fetch are a difficult task, as
                      measurement heights that are too high or too low above the
                      canopy adversely affect results. The aim of this study is to
                      assess implications from measurement height in regard to
                      low-pass filtering, footprint representativeness, and energy
                      balance closure for a clear-cut site with regrowing
                      vegetation of varying height. For this, measurements from
                      two open-path eddy-covariance systems at different heights
                      are compared over the course of one growing season.
                      Particular attention is paid to low-pass-filtering
                      corrections, for which five different methods are compared.
                      Results indicate significant differences between fluxes from
                      the upper and lower systems, which likely result from
                      footprint differences and an insufficient spectral
                      correction for the lower system. Different
                      low-pass-filtering corrections add an uncertainty of $3.4\%$
                      $(7.0\%)$ to CO2 fluxes and $1.4\%$ $(3.0\%)$ to H2O fluxes
                      for the upper (lower) system, also leading to considerable
                      differences in cumulative fluxes. Despite limitations in the
                      analysis, which include the difficulty of applying a
                      footprint model at this study site and the likely influence
                      of advection on the total exchange, the analysis confirms
                      that information about the choice of spectral correction
                      method and measurement-height changes are critical for
                      interpreting data at complex sites.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / TERENO - Terrestrial Environmental
                      Observatories (TERENO-2008)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(DE-HGF)TERENO-2008},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000793635600001},
      doi          = {10.1007/s10546-022-00700-1},
      url          = {https://juser.fz-juelich.de/record/907699},
}