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Parameterization of exchange processes over a barley field |
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| Authors: | Meelis Mölder |
| Institution: | (1) Institute of Astrophysics and Atmospheric Physics, Estonian Academy of Sciences, EE-2444 Tõravere, Tartumaa, Estonia;(2) Present address: Department of Hydrology, Uppsala University, Norbyvägen 18B, 752 36 Uppsala, Sweden |
| Abstract: | Wind and temperature profiles and surface radiation temperature were measured over barley during two observation periods in Estonia. The calculated displacement height (d) could be taken as 3/4 and 2/3 of the canopy height (h) for a dense and a moderate canopy respectively. The roughness length for wind speed was best approximated with the relation z0u = 0.3(h - d). The excess resistance to heat exchange kB-1 was the most doubtful parameter, but it was concluded that kB-1 = 2 is a good estimate for the time being. |
| Keywords: | Atmospheric surface layer Similarity theory Displacement height Roughness length Excess resistance Surface radiation temperature |
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