Abstract
AbstractIn surface flux parametrizations, aerodynamic roughness length zm0, and thermal roughness length zh0, are used to account for different resistances for momentum transfer and heat transfer. This paper introduces a turbulence‐related length hT and parametrizes the quantity kA−1=ln(hT/zh0) in order to estimate zh0. Based on data at three sites on the Tibetan Plateau, a general formula for kA−1 is obtained for the surfaces covered by bare soil or partially covered by very short vegetation. A surface flux parametrization with this formula provides better estimates of heat flux than either profile flux parametrization or surface flux parametrization with kB−1 (i.e. ln(zm0/zh0)). Therefore, the use of a reasonable length to scale zh0 can contribute to the improvement of surface flux parametrizations. Copyright © 2002 Royal Meteorological Society
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