Radiative surface temperature and energy balance of a wheat canopy |
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| Authors: | N D S Huband J L Monteith |
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| Institution: | (1) Department of Physiology and Environmental Science, University of Nottingham, School of Agriculture, LE12 5RD Sutton Bonington, Loughborough, UK;(2) Present address: Crop Protection Division, Univ. of Bristol, Dept. of Agricultural Sciences, Long Ashton Research Station, BS18 9AE Bristol, UK;(3) Laboratory for Terrestrial Physics, NASA/Goddard Space Flight Center, 20771 Greenbelt, MD, USA |
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| Abstract: | The sensible heat loss from a stand of winter wheat was calculated from radiometric measurements of crop surface temperature, measurements of air temperature, and an atmospheric resistance to momentum transfer; corresponding latent heat flux was obtained through the energy balance equation. These estimates of sensible and latent heat were compared with fluxes from the Bowen Ratio method. When radiative temperature was derived using a measured canopy emissivity of 0.98, calculations of sensible heat flux were systematically 50–100 W m-2 less than Bowen Ratio values. The two techniques agreed more closely when an apparent emissivity of 0.96 was used with an apparent reflectivity of 0.03. The mean difference between the estimates of latent heat flux was then -16 ± 32 W m-2.The surface temperature method showed less systematic error in comparison with the Bowen Ratio values than did estimates using the aerodynamic method.On leave from: University of Nottingham, School of Agriculture, Loughborough LE12 5RD. |
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