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@ARTICLE{Guglielmetti:59716,
      author       = {Guglielmetti, M. and Schwank, M. and Mätzler, C. and
                      Oberdörster, C. and Vanderborght, J. and Flühler, H.},
      title        = {{M}easured {M}icrowave {R}adiative {T}ransfer {P}roperties
                      of a {D}eciduous {F}orest {C}anopy},
      journal      = {Remote sensing of environment},
      volume       = {109},
      issn         = {0034-4257},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-59716},
      pages        = {523 - 532},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A field experiment was performed with an L- and X-band
                      radiometer operating at 1.4 GHz and 11.4 GHz in a deciduous
                      forest in Julich (Germany) from September to November 2004.
                      The radiometers were installed on the ground being directed
                      upwards through the canopy. In this position downwelling
                      microwave radiation was measured during the defoliation of
                      the forest with a time resolution of 4 h. Simultaneously we
                      measured the air and soil temperatures.Based on these data,
                      the transmissivities of the forest canopy were estimated at
                      different foliation states. Typical L-band transmissivities
                      determined for the foliated and the defoliated states were
                      0.41 and 0.46, confirming the semi-transparency of the
                      canopy at low microwave frequencies. Due to the anisotropic
                      crown structure the L-band brightness temperatures were
                      slightly horizontally polarized to the same degree for any
                      state of the vegetation. From this we conclude that branches
                      are the prevailing emitters of the canopy whereas leaves and
                      trunks are less relevant for L-band observations. In the
                      X-band, the canopy was opaque in the foliated state and
                      became semi-transparent in the course of defoliation
                      indicating that leaves are an important radiation source at
                      this wavelength.Our results provide the experimental
                      evidence to quantify the radiation properties of a deciduous
                      forest canopy. This is crucial for interpreting the
                      microwave radiation emitted from forested areas measured
                      from space-borne microwave sensing platforrns. (C) 2007
                      Elsevier Inc. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {050},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Remote Sensing / Imaging Science
                      $\&$ Photographic Technology},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000248293300012},
      doi          = {10.1016/j.rse.2007.02.003},
      url          = {https://juser.fz-juelich.de/record/59716},
}