Local Similarity Relationships of Non-Dimensional Wind and Temperature Gradient in the Tower-Layer Atmosphere over Beijing City

摘要

Micrometeorological data for wind and temperature from a 325 m high tower in Beijing City are analyzed by use of local similarity theory. Non-dimensional wind and temperature gradients. Ф_m and Ф_h,. are determined by three techniques called, respectively. eddy-correlation. mean profiles and inertia-subrange cospectra (ISC) method for a wide range of atmospheric stratification from unstable to stable conditions. Average dissipation rate Ф_ε. of turbulent kinetic energy (TKE) is evaluated from u-spectrum. as a quantity required in the last technique. Ratio of the eddy transfer coefficients.α(= K_h / K_m). is calculated from Ф_m and Ф_h estimations. The results from various techniques are compared with each other and with some available empirical results in the tower-layer. It is shown that the empirical relationships determined by mean profiles and ISC methods in the tower-layer turbulence are in agreement with each other and with some other results.