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@ARTICLE{Middleton:837196,
      author       = {Middleton, Elizabeth and Rascher, Uwe and Corp, Lawrence
                      and Huemmrich, K. and Cook, Bruce and Noormets, Asko and
                      Schickling, Anke and Pinto, Francisco and Alonso, Luis and
                      Damm, Alexander and Guanter, Luis and Colombo, Roberto and
                      Campbell, Petya and Landis, David and Zhang, Qingyuan and
                      Rossini, Micol and Schuettemeyer, Dirk and Bianchi, Remo},
      title        = {{T}he 2013 {FLEX}—{US} {A}irborne {C}ampaign at the
                      {P}arker {T}ract {L}oblolly {P}ine {P}lantation in {N}orth
                      {C}arolina, {USA}82},
      journal      = {Remote sensing},
      volume       = {9},
      number       = {6},
      issn         = {2072-4292},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2017-06175},
      pages        = {612 -},
      year         = {2017},
      abstract     = {The first European Space Agency (ESA) and NASA
                      collaboration in an airborne campaign to support ESA’s
                      FLuorescence EXplorer (FLEX) mission was conducted in North
                      Carolina, USA during September–October 2013 (FLEX-US 2013)
                      at the Parker Tract Loblolly Pine (LP) Plantation (Plymouth,
                      NC, USA). This campaign combined two unique airborne
                      instrument packages to obtain simultaneous observations of
                      solar-induced fluorescence (SIF), LiDAR-based canopy
                      structural information, visible through shortwave infrared
                      (VSWIR) reflectance spectra, and surface temperature, to
                      advance vegetation studies of carbon cycle dynamics and
                      ecosystem health. We obtained statistically significant
                      results for fluorescence, canopy temperature, and tower
                      fluxes from data collected at four times of day over two
                      consecutive autumn days across an age class chronosequence.
                      Both the red fluorescence (F685) and far-red fluorescence
                      (F740) radiances had highest values at mid-day, but their
                      fluorescence yields exhibited different diurnal responses
                      across LP age classes. The diurnal trends for F685 varied
                      with forest canopy temperature difference (canopy minus
                      air), having a stronger daily amplitude change for young vs.
                      old canopies. The Photochemical Reflectance Index (PRI) was
                      positively correlated with this temperature variable over
                      the diurnal cycle. Tower measurements from mature loblolly
                      stand showed the red/far-red fluorescence ratio was linearly
                      related to canopy light use efficiency (LUE) over the
                      diurnal cycle, but performed even better for the combined
                      morning/afternoon (without midday) observations. This study
                      demonstrates the importance of diurnal observations for
                      interpretation of fluorescence dynamics, the need for red
                      fluorescence to understand canopy physiological processes,
                      and the benefits of combining fluorescence, reflectance, and
                      structure information to clarify canopy function versus
                      structure characteristics for a coniferous forest},
      cin          = {IBG-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000404623900103},
      doi          = {10.3390/rs9060612},
      url          = {https://juser.fz-juelich.de/record/837196},
}