沿岸都市域の熱環境におよぼす局地風の影響

抄録

The numerical experiment using a three-dimensional non-hydrostatic model (ARPS) was performed to examine the basic characteristics of the local wind on the Fukuoka Plains in Japan. The result shows a clear local wind circulation. The nocturnal local wind consisting of land breeze and mountain wind blows on the coastal area, t from 23:00 to 7:00. The diurnal local wind consisting of sea breeze and valley wind is induced from 8:30 to past 21:00. The horizontal air temperature distribution shows that the advection of mountain wind reduces inland temperatureat night and the advection of cold sea breeze in the daytime causes a temperature difference of 2°C between the coastal and inland areas. The heat budget ofthe atmospheric boundary layer was estimated using the calculation results. The local heat advection due to the nocturnal wind is about -60 W m^-2 over the plain. On the other hand, the local heat advection due to the diurnal windis -250 W m^-2 on the coastal area. This value is more than the half of the surface sensible heat flux. This shows that the cold air advection due to the sea breeze suppresses considerably the heating of the atmospheric boundary layer.