都心の緑地が有する夏季における夜間の冷却能力に関する研究

抄録

Recently, because there has been increasing of people who get disturbed sleep and have heatstroke, urban heat island phenomenon has become a serious topic of public concern. At the same time, it sometimes brings about disaster that is caused by localized torrential downpour into urban area that is covered with asphalt or concrete. This paper aims to clarify the cooling potential of urban green spaces during the night in summer. Specifically, we showed that green spaces and anthropogenic heat emission affect the temperature in urban downtown areas clearly. We obtained them by calculating the multiple regression analysis applying various types of data that were collected from 27 observation points of Tokyo's Minato-Ku. As a result, we found out that the cooling potential by green spaces of 150 square meters would offset the increasing of temperature by the anthropogenic heat released from 87 offices of the average size in Minato-Ku, having a total floor area of about 259,900 square meters. Finally, we compared result data of this research with daytime data of which we got one year ago. Based on this background, we obtained that green spaces in urban downtown areas have the function of natural air-conditioner working through day and night.