盆地上空の安定層と局地風の形成-京都盆地-

Abstract

The purpose of the paper is to understand the thermal and dynamical effects of the topo-graphy to the lower atmosphere over the Basin. Variations with time and height of wind speedand potential temperature observed at the central part of the Kyoto Basin and hourly variationsof wind speed and direction at the surface of the Kyoto Basin are analyzed.In the afternoon, the stability of the lower atmosphere is a near neutral and wind directionof the lower atmosphere is almost same as a general flow, however wind speed is about a half.In the early morning, stable layer and local wind are formed over the Kyoto Basin.Transfer mechanism of the energy from a general flow to the lower atmosphere are inves-tigated by consideration of the instability in the relative motion of the different layers. Mecha-nism of the southerly local wind in the early morning, over the Kyoto Basin 10 km in horizontalscale, 300 m in vertical, 6 hours in duration, is a thermal convection in a stratified fluid causedby the horizontal temperature difference between north and south.