On the Mountain and Valley Breeges (II)

[摘要] (a) The valley breeze at the foot of Mt. Tukuba begins from 8h-9h, a. m. and it reaches the maximum at 11h a. m.; from 4h p. m. the mountain breeze blows and the maximum occurs at 6h p. m. From midnight to morning it is calm. The valley breeze blows off fog near the top of the mountain. The frequency of fog is large at 9h a. m. and has minimum at noon and again at 3h-4h p. m. shows maximum. This is the time of the beginning of the mountain breeze.(b) When it is fair the diurnal variation of the wind-vector at the foot of the mountain describes an ellipse. Its major axis and the hangdirection of mountain are perpendicular to each other. This coincides with the law which has been found by T. Okada and T. Yamada as to the effect of topography on the diurnal variation of wind direction.

[学科分类] 大气科学