京都市近郊における大気境界層乱流 --2019年秋季における観測事例--

Abstract

Intensive observations of wind and turbulence in the atmospheric boundary layer (ABL) were conducted in the suburbs of Kyoto City during the autumn season of 2019. During the daytime in the afternoon, strong winds in the lower ABL were observed by a Doppler lidar and a sonic anemometer. Intermittent occurrence of the further intensification of wind speed was also observed. During the period of strong winds, large-scale areas of upward velocity or high speed with temporal scales of approximately 80 s or more were detected by the Doppler lidar and sonic anemometer observation. The wind pattern of a high-speed area and a low-speed area resembles that of the coherent structure, which consists of a weak ejection (region of upward motion) and a strong sweep (region of downward motion).