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日本ヒートアイランド学会論文集 Vol.16 (2021)

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Long-term trends of newspaper coverage on climate change and summer heat

藤部文昭 Fumiaki Fujibe*1 松本 淳 Jun Matsumoto *1 

*1 東京都立大学都市環境学部 Faculty of Urban Environmental Sciences, Tokyo Metropolitan University


Online search systems of four major newspapers in Japan were used to find long-term changes in the coverage of key words related to climate change and summer heat for the period 1990 to 2019. It is shown that the coverage of "global warming" has an interannual variation with maxima corresponding to the publication of IPCC reports, with a distinct surge from 2007 to 2010. On the other hand, the coverage of "heat island" decreased markedly and that of "heat stroke" increased rapidly in the 2010s.

Practical measurement method for the effect of wind speed reduction by trees in green space on temperature field

北原俊史 Toshifumi Kitahara*1 高木直樹 Naoki Takagi *2 浅輪貴史 Takashi Asawa *1 円井 基史 Motofumi Marui *3

*1 東京工業大学 Tokyo Institute of Technology
*2 信州大学 Shinshu University
*3 金沢工業大学 Kanazawa Institute of Technology


Green spaces are considered to be an effective way of mitigating the urban heat island effect. The reduction in wind speed behind trees and buildings modifies the environmental conditions or microclimate. This phenomenon is known as the Hidamari effect. In this study, we developed the practical measurement method, and we applied it for understanding the effect of wind speed reduction by trees in green space on the temperature field.