Relationships between Evaporative Fraction and Remotely Sensed Vegetation Index and Microwave Brightness Temperature for Semiarid Rangelands
作者： W. P. Kustas , T. J. Schmugge , K. S. Humes , T. J. Jackson , R. Parry
DOI: 10.1175/1520-0450(1993)032<1781:RBEFAR>2.0.CO;2
关键词: Microwave 、 Available energy 、 Latent heat 、 Heat flux 、 Water content 、 Remote sensing 、 Environmental science 、 Evapotranspiration 、 Microwave radiometer 、 Brightness temperature
摘要: Abstract Measurements of the microwave brightness temperature (TB) with Pushbroom Microwave Radiometer (PBMR) over Walnut Gulch Experimental Watershed were made on selected days during MONSOON 90 field campaign. The PBMR is an L-band instrument (21-cm wavelength) that can provide estimates near-surface soil moisture a variety surfaces. Aircraft observations in visible and near-infrared wavelengths collected also used to compute vegetation index. Continuous micrometeorological measurements daily samples obtained at eight locations experimental period. Two sites instrumented time domain reflectometry probes monitor profile. fraction available energy for evapotranspiration was computed by taking ratio latent heat flux (LE) sum net radiation (Rn) (G). This commonly called evaporative (EF) normally varies between 0 1 un...
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