Abstract
The importance of the energy exchange between the land surface and the atmosphere can be characterized by bulk transfer coefficients for momentum, Cd, and heat, Ch. The diurnal and monthly variations of both bulk transfer coefficients and lengths of surface roughness are analyzed. Based on observed data from January to December 2009 in hinterland of the Taklimakan Desert, the characteristics of aerodynamic roughness length, z0m, and thermal roughness length, z0h, are discussed. It should be noted that the diurnal and monthly variations of the parameters are fundamentally different from those reported in vegetated areas. Specifically, four unique features can be identified in the surface layer. First, in Taklimakan Desert, z0m does not vary with seasons; however, it significantly depends on wind speed. Second, z0h is higher in the daytime and lower at night, showing obvious diurnal characteristics. The high values appear at sunrise and sunset. Third, both Cd and Ch have two peaks, one peak at sunrise, and another one at noon. Fourth, both Cd and Ch have larger values in winter season and smaller values in summer season.
Highlights
The importance of the energy exchange between the land surface and the atmosphere can be characterized by bulk transfer coefficients for momentum, Cd, and heat, Ch
The energy exchange is dependent on several important parameters, including the surface albedo (α), the surface emissivity (ε), the aerodynamic and thermal roughness lengths (z0m and z0h), and the bulk transfer coefficients for momentum Cd and heat Ch
We examined the seasonal variations of Cd and Ch, and their relationships with the atmospheric stability
Summary
The importance of the energy exchange between the land surface and the atmosphere can be characterized by bulk transfer coefficients for momentum, Cd, and heat, Ch. Their peaks do not match closely to the atmospheric stability, because the values are influenced by surface aerodynamic and thermal roughness lengths.
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