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000059716 084__ $$2WoS$$aEnvironmental Sciences
000059716 084__ $$2WoS$$aRemote Sensing
000059716 084__ $$2WoS$$aImaging Science & Photographic Technology
000059716 1001_ $$0P:(DE-HGF)0$$aGuglielmetti, M.$$b0
000059716 245__ $$aMeasured Microwave Radiative Transfer Properties of a Deciduous Forest Canopy
000059716 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2007
000059716 300__ $$a523 - 532
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000059716 440_0 $$012722$$aRemote Sensing of Environment$$v109$$x0034-4257
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000059716 520__ $$aA field experiment was performed with an L- and X-band radiometer operating at 1.4 GHz and 11.4 GHz in a deciduous forest in Julich (Germany) from September to November 2004. The radiometers were installed on the ground being directed upwards through the canopy. In this position downwelling microwave radiation was measured during the defoliation of the forest with a time resolution of 4 h. Simultaneously we measured the air and soil temperatures.Based on these data, the transmissivities of the forest canopy were estimated at different foliation states. Typical L-band transmissivities determined for the foliated and the defoliated states were 0.41 and 0.46, confirming the semi-transparency of the canopy at low microwave frequencies. Due to the anisotropic crown structure the L-band brightness temperatures were slightly horizontally polarized to the same degree for any state of the vegetation. From this we conclude that branches are the prevailing emitters of the canopy whereas leaves and trunks are less relevant for L-band observations. In the X-band, the canopy was opaque in the foliated state and became semi-transparent in the course of defoliation indicating that leaves are an important radiation source at this wavelength.Our results provide the experimental evidence to quantify the radiation properties of a deciduous forest canopy. This is crucial for interpreting the microwave radiation emitted from forested areas measured from space-borne microwave sensing platforrns. (C) 2007 Elsevier Inc. All rights reserved.
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000059716 65320 $$2Author$$amicrowave radiometry
000059716 65320 $$2Author$$apassive microwave remote sensing
000059716 65320 $$2Author$$asoil moisture
000059716 65320 $$2Author$$adeciduous forest
000059716 65320 $$2Author$$acanopy transmissivity
000059716 7001_ $$0P:(DE-HGF)0$$aSchwank, M.$$b1
000059716 7001_ $$0P:(DE-HGF)0$$aMätzler, C.$$b2
000059716 7001_ $$0P:(DE-Juel1)VDB35190$$aOberdörster, C.$$b3$$uFZJ
000059716 7001_ $$0P:(DE-Juel1)129548$$aVanderborght, J.$$b4$$uFZJ
000059716 7001_ $$0P:(DE-HGF)0$$aFlühler, H.$$b5
000059716 773__ $$0PERI:(DE-600)1498713-2$$a10.1016/j.rse.2007.02.003$$gVol. 109, p. 523 - 532$$p523 - 532$$q109<523 - 532$$tRemote sensing of environment$$v109$$x0034-4257$$y2007
000059716 8567_ $$uhttp://dx.doi.org/10.1016/j.rse.2007.02.003
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