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@ARTICLE{Dimitrov:150362,
      author       = {Dimitrov, M. and Vanderborght, J. and Kostov, K. G. and
                      Jadoon, K. Z. and Weihermüller, L. and Jackson, T. J. and
                      Bindlish, R. and Pachepsky, Y. and Schwank, M. and
                      Vereecken, H.},
      title        = {{S}oil {H}ydraulic {P}arameters and {S}urface {S}oil
                      {M}oisture of a {T}illed {B}are {S}oil {P}lot {I}nversely
                      {D}erived from {L}-{B}and {B}rightness {T}emperatures},
      journal      = {Vadose zone journal},
      volume       = {13},
      number       = {1},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {FZJ-2014-00432},
      pages        = {1-18},
      year         = {2014},
      abstract     = {L-band radiometers can be used to remotely monitor the
                      microwave brightness temperature of land surfaces. We
                      investigated how soil hydraulic properties and soil moisture
                      contents of a bare soil plot can be inferred from L-band
                      brightness temperatures using a coupled inversion
                      approach.We coupled a radiative transfer model and a soil
                      hydrologic model (HYDRUS 1D) with an optimization routine to
                      derive soil hydraulic parameters, surface roughness, and
                      soil moisture of a tilled bare soil plot using measured
                      brightness temperatures at 1.4 GHz (L-band), rainfall, and
                      potential soil evaporation. The robustness of the approach
                      was evaluated using five 28-d data sets representing
                      different meteorological conditions. We considered two soil
                      hydraulic property models: the unimodal Mualem–van
                      Genuchten and the bimodal model of Durner. Microwave
                      radiative transfer was modeled by three different
                      approaches: the Fresnel equation with depth-averaged
                      dielectric permittivity of either 2- or 5-cm-thick surface
                      layers and a coherent radiative transfer model (CRTM) that
                      accounts for vertical gradients in dielectric permittivity.
                      Brightness temperatures simulated by the CRTM and the
                      2-cm-layer Fresnel model fitted well to the measured ones.
                      L-band brightness temperatures are therefore related to the
                      dielectric permittivity and soil moisture in a 2-cm-thick
                      surface layer. The surface roughness parameter that was
                      derived from brightness temperatures using inverse modeling
                      was similar to direct estimates from laser profiler
                      measurements. The laboratory-derived water retention curve
                      was bimodal and could be retrieved consistently for the
                      different periods from brightness temperatures using inverse
                      modeling. A unimodal soil hydraulic property function
                      underestimated the hydraulic conductivity near saturation.
                      Surface soil moisture contents simulated using retrieved
                      soil hydraulic parameters were compared with in situ
                      measurements. Depth-specific calibration relations were
                      essential to derive soil moisture from near-surface
                      installed sensors.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000330971700007},
      doi          = {10.2136/vzj2013.04.0075},
      url          = {https://juser.fz-juelich.de/record/150362},
}