日本ヒートアイランド学会

横山 仁　Hitoshi YOKOYAMA*1 長谷川 薫　Kaoru HASEGAWA*1,2 日下 博幸　Hiroyuki KUSAKA*3 　

*1 防災科学技術研究所 National Research Institute for Earth Science and Disaster Resilience

*2 現所属 ESRI ジャパン株式会社 Esri Japan Corporation

*3 筑波大学計算科学研究センター Center for Computational Sciences, University of Tsukuba

概要

We installed thermometers in instrument shelters at elementary schools in Tsukuba City, Ibaraki Prefecture, and conducted mobile observations using a car to investigate nighttime air temperature distribution in the city. Nighttime air temperatures were high in Kasuga and Midori-no-chuo districts, and low in Yoshinuma district. These results differed from the 2008 observations by Kusaka et al. (2012), who reported that the highest air temperatures were near Tsukuba Station. When we investigated the relationship between nighttime temperatures and green coverage ratio of the area, we found higher negative correlation (R=-0.67), meaning that even in the city center, air temperature was lower if green coverage ratio was higher. Since nighttime air temperatures are said to be closely related to heatstroke and sleep disorders, it is also important for Tsukuba City to maintain and increase green coverage ratio.