秋季における大気境界層での風速変動

Abstract

Wind speed in the atmospheric boundary layer (ABL) changes in a variety of time scales. During autumn season, stability of the ABL varies from near neutral to unstable conditions in the daytime. This certainly affects the wind near the surface. In this study, variation of the wind at two places was investigated. At the Ujigawa Open Laboratory in Kyoto City, intermittent events of large fluxes in the surface layer were observed by sonic anemometers at around midday and in the afternoon. On the other hand, at the Nagoya Local Meteorological Observatory in Nagoya City, a wind profiler shows that the difference of wind speeds at the observation levels becomes small in the morning and the wind speeds gradually increase in the afternoon.