BEHAVIORS OF SEA BREEZE ABOVE FUKUOKA CITY

Abstract

Behaviors of sea breeze above Fukuoka City have been investigated on the basis of AMeDAS data and field observations. The land and sea breeze is influenced strongly by the topography near Fukuoka City and blows steady along the northwest-southeast line. Sea breeze observations performed by using a doppler sodar have revealed the existence of a coherent structure consisted of a pair of ascending and descending currents. The cross-correlation coefficients between horizontal andvertical velocities vary with 30 min period and take a value nearly equal to zero when the time lag is 0. Therefore, it is concluded that the coherent structuremay be due to the internal wave motion induced by the shear instability.