The drag coefficient ( π΄π΄ π΄π΄ππ ) is an important parameter of the land surface layer that represents the efficiency of momentum exchange between the Earth's surface and is thus important in numerical models for the climate simulation and weather forecasting, such as the prediction of typhoons (Emanuel, 1995) and sandstorms (Okin, 2005). Previous studies documented that π΄π΄ π΄π΄ππ levels off over land (Raupach & Thom, 1981;Wieringa, 1993
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