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@ARTICLE{vanderTol:826626,
      author       = {van der Tol, Christiaan and Rossini, Micol and Cogliati,
                      Sergio and Verhoef, Wouter and Colombo, Roberto and Rascher,
                      Uwe and Mohammed, Gina},
      title        = {{A} model and measurement comparison of diurnal cycles of
                      sun-induced chlorophyll fluorescence of crops},
      journal      = {Remote sensing of environment},
      volume       = {186},
      issn         = {0034-4257},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-00845},
      pages        = {663 - 677},
      year         = {2016},
      abstract     = {In this study, measurements of solar induced chlorophyll
                      fluorescence (SIF) at 760 nm (F760) are combined with
                      hyperspectral reflectance (R) measurements collected in the
                      field over agricultural crops in order to better understand
                      the fluorescence (ChlF) signal of the vegetation. The
                      ‘Soil-Canopy Observation Photosynthesis and Energy fluxes'
                      (SCOPE) model, which combines radiative transfer and enzyme
                      kinetics of photosynthesis with turbulent heat exchange in
                      vegetation canopies, was partly inverted to obtain model
                      parameters from R taken over healthy (unstressed) crops
                      during the growing season. Reflectance spectra between 400
                      and 900 nm obtained at midday on different days in the
                      growing season were used to obtain pigment concentrations,
                      leaf area index and leaf inclination. These parameters were
                      then used to simulate diurnal cycles of half-hourly ChlF
                      spectra, using measured weather variables as input. Three
                      scenarios were simulated: (i) a constant emission efficiency
                      of ChlF (at the photosystem level), (ii) a variable emission
                      efficiency calculated per half hour with an electron
                      transport, photosynthesis and ChlF model for the
                      photosystem, and (iii) a constant emission efficiency that
                      was set to a theoretical maximum value for fully blocked
                      photochemical electron transport of photosystem II and
                      minimal non-photochemical quenching. The simulations of the
                      first two scenarios were compared to ChlF retrieved from
                      field measurements in the O2-A band with the spectral
                      fitting method in unstressed rice and alfalfa. This
                      comparison and a sensitivity analysis showed that SCOPE
                      reproduces most of the seasonal variability of SIF after
                      tuning to R even if the ChlF emission efficiency is kept
                      constant, and F760 values are mostly determined by
                      chlorophyll content, dry matter, senescent material and leaf
                      area and leaf inclination, whereas leaf water and carotenoid
                      content had small effects. Diurnal variations in the ChlF
                      emission efficiency at photosystem level were small in these
                      crops. The simulations of the third scenario were compared
                      to measurements of grass that was treated chemically to
                      block electron transport and to provoke maximum ChlF. This
                      comparison showed that the observed increase in F760 can
                      indeed be explained by a change in the ChlF emission
                      efficiency at the photosystem level. It is concluded that
                      hyperspectral reflectance and the ChlF signal together can
                      reveal both the dynamics of vegetation structure and
                      functioning.},
      cin          = {IBG-2},
      ddc          = {050},
      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:000396382500050},
      doi          = {10.1016/j.rse.2016.09.021},
      url          = {https://juser.fz-juelich.de/record/826626},
}