中立に近い大気境界層での風速変動

Abstract

Wind variation in the near-neutral atmospheric boundary layer (ABL) observed by the wind profiler of the Japan Meteorological Agency were investigated. The measured data at Nagoya Local Meteorological Observatory were used for the study of ABL wind in the large plane. In the daytime, the decrease of wind speed in the morning and the subsequent increase of them in the afternoon were observed in the ABL. From the diurnal change of the wind profile, we infer that turbulent mixing and the resultant downward transfer of momentum in the daytime can reduce the vertical wind shear. Wind variation in the time scale of 30 to 60 min is also found in the period of wind intensification.