Abstract
We observed the turbulence and vertical profile of temperature in and above the roughness sublayer (RS) using a tower, a tethered balloon and a Doppler sodar in Himeji City. A 3-D ultrasonic anemometer-thermometer was sited at a height of 54 m on the tower. The present results showed that in the RS, the ratio of friction velocity to wind speed, u*/u, observed under unstable conditions of − 4.2 < z′/L < −0.5 were close to those under neutral conditions, where z´ = z – d; the displacement height d = 2 m; L is the Monin-Obkhov stability length. In addition, σw/u* were lower than the universal function presented by Panofsky et al. (1977). The cross correlation coefficients for u′w′ and T′w′ under neutral and unstable conditions were also studied.
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