Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 11 2 2007 10.5194/hess-11-769-2007 http://www.hydrol-earth-syst-sci.net/11/769/2007/ http://www.hydrol-earth-syst-sci.net/11/769/2007/hess-11-769-2007.html http://www.hydrol-earth-syst-sci.net/11/769/2007/hess-11-769-2007.pdf 769 783 2007-01-24 Evaluating parameterizations of aerodynamic resistance to heat transfer using field measurements Shaomin Liu smliu@bnu.edu.cn L. Lu D. Mao L. Jia State key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, China Alterra Green World Research Institute, Wageningen University and Research Centre, The Netherlands Parameterizations of aerodynamic resistance to heat and water transfer have a significant impact on the accuracy of models of land – atmosphere interactions and of estimated surface fluxes using spectro-radiometric data collected from aircrafts and satellites. We have used measurements from an eddy correlation system to derive the aerodynamic resistance to heat transfer over a bare soil surface as well as over a maize canopy. Diurnal variations of aerodynamic resistance have been analyzed. The results showed that the diurnal variation of aerodynamic resistance during daytime (07:00 h–18:00 h) was significant for both the bare soil surface and the maize canopy although the range of variation was limited. Based on the measurements made by the eddy correlation system, a comprehensive evaluation of eight popularly used parameterization schemes of aerodynamic resistance was carried out. The roughness length for heat transfer is a crucial parameter in the estimation of aerodynamic resistance to heat transfer and can neither be taken as a constant nor be neglected. Comparing with the measurements, the parameterizations by Choudhury et al. (1986), Viney (1991), Yang et al. (2001) and the modified forms of Verma et al. 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