The Observation of Diurnal Variation of Wind in Spring over Urban Area of Tokyo

Abstract

The purpose of this study is to elucidate the wind field at the time of fine weather in Kanto Plain. We have observed the wind profile in the surface boundary layer using Doppler Sodar. It is located in the Tokyo bay coast since August, 2003. When the migratory anticyclone covered Japan, and the temperature difference in the daytime and nighttime was remarkable, two types of wind profile, sea breeze, land breeze was measured. And, these wind profiles showed daily variation. During the transition from the land breeze to the sea breeze, the wind direction changed from northerly to southerly. And during the transition from the sea breeze to the land breeze, the wind direction changed from southerly to northerly. In this paper, the relationship between sea breeze and land breeze is discussed.