Abstract
To promote ventilation in the street canyon is one of the effective heat island measures. Some large cities in Japan are located in the coastal area, so it is thought that the benefit of air temperature reduction is provided by strong sea breeze in those cities. The analysis on air temperature reduction by sea breeze is carried out based on upper weather data, which is observed by the sensors set on the 4 steel towers in Osaka area. The observation height of upper weather data are from 42 to 84 m. The actual condition of land and sea breezes, the difference of air temperature and wind velocity between on the neighborhood of shore and the inland, air temperature difference between upper and ground level and the diurnal change of air temperature and wind velocity are considered based on observed data in summer season.
