京都盆地の局地気象

Abstract

Wind data at Ujigawa Meteorological Tower at 50m height and over Yonago at 900mbsurface are analysed from April 1976 to April 1977. The detailed investigations of the diurnaland seasonal variations in the wind speed and direction are made. At daytime, in the periodof the strongest vertical mixing, wind speed at the 50m height attains a maximum, at the900mb surface a minimum and the wind direction controlled by synoptic weather conditionsis not so different between them. At night time, wind speed is a reverse and the wind directiondifference between at 5Om height and at 900mb surface is very large.Besides the strong wind, from night to early morning at the lower layer over the Kyotobasin, the wind speed deceases less than 2m/s and wind direction which differs from theuper layer is northward or southward. The mechanism of local winds is discussed con-sidering the distribution of temperature field associate with local topography over the Kyotobasin.