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@INPROCEEDINGS{Siegmann:890120,
      author       = {Siegmann, Bastian and Herrera, David and Junker-Frohn,
                      Laura and Muller, Onno and Rademske, Patrick and Quiros,
                      Juan and Rascher, Uwe and Cogliati, Sergio and Damm,
                      Alexander and Kraska, Thorsten and Schüttemeyer, Dirk},
      title        = {{D}ownscaling of far-red solar-induced chlorophyll
                      fluorescence from canopy to leaf scale using data from the
                      airborne imaging spectrometer {H}y{P}lant},
      reportid     = {FZJ-2021-00709},
      year         = {2020},
      abstract     = {The FLuorescence EXplorer (FLEX) of the European Space
                      Agency (ESA) will be the first hyperspectral mission
                      especially designed to monitor the photosynthetic activity
                      of the terrestrial vegetation layer by using a completely
                      novel technique measuring the sun-induced chlorophyll
                      fluorescence (SIF) signal that originates from the core of
                      the photosynthetic machinery. In preparation of the upcoming
                      FLEX satellite mission, large campaigns, namely FLEXSense I
                      and II, were conducted in 2018 and 2019 including
                      representative study sites at several locations in middle
                      and southern Europe.As an example of the numerous FLEXSense
                      campaign activities, the results of a field study are
                      presented, which took place at the agricultural research
                      station Campus Klein-Altendorf in Germany in the end of June
                      2018. In a period of four consecutive days from 26 to 29
                      June, the test site was recorded six times by the airborne
                      imaging spectrometer HyPlant, with each three overflights
                      before and three after local solar noon. The two sensor
                      modules of HyPlant measure contiguous spectral information
                      from 370 to 2500 nm, as well as highly-resolved spectral
                      data in the O2-A and B absorption features which allows
                      retrieving SIF at 760 and 687 nm. The availability of such a
                      unique dataset makes it possible for the first time to
                      investigate the spatial differences in SIF of different
                      crops (sugar beet, winter wheat and fruit trees) in the
                      course of the day. Furthermore, the recently developed
                      fluorescence correction vegetation index (FCVI) (Yang et al.
                      2020, RSE 240:111676) was applied to the HyPlant image data
                      to correct for photosynthetic active radiation (PAR)
                      absorption and scattering effects, which makes it possible
                      to determine the SIF escape fraction (fesc) and thus to
                      scale SIF760 from canopy to leaf level. Applying this
                      approach reduces the influence of physical processes on
                      far-red SIF and helps to better understand and interpret the
                      physiological information content of the SIF signal.},
      month         = {Dec},
      date          = {2020-12-01},
      organization  = {AGU Fall Meeting 2020, Online (USA), 1
                       Dec 2020 - 17 Dec 2020},
      subtyp        = {After Call},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/890120},
}