Impacts of Land Use and Human Activity on Spatial-Pattern Characteristics of Temperature and the Heat Index in the Central City Area

  • Hiroyuki KUSAKA
    筑波大学計算科学研究センター教授
  • Kosuke IGARI
    パシフィックコンサルタンツ株式会社
  • Reiko KOKUBO
    現在株式会社電通
  • Takuto SATO
    筑波大学大学院生命環境科学研究科博士後期課程
  • Quang Van DOAN
    The Centre for Climate Research Singapore(a research division of the Meteorological Service Singapore)

Bibliographic Information

Other Title
  • 土地利用と人間活動が都市中心部の気温と暑さ指数の分布特性に及ぼす影響

Abstract

<p>This study revealed the impacts of land use and anthropogenic heat on the heterogeneous spatial patterns of temperature and the thermal index in Shibuya ward in Tokyo, which contains a commercial area, residential area, and park within 1–2 km2. Observations revealed that temperature in the residential area was slightly higher than that in the commercial area during the daytime. The park had the lowest temperature of the three. At night, temperature in the commercial area was the highest and that in the park was the lowest. Additionally, observations showed that a surface inversion layer developed over the park at night, whereas a surface unstable layer occurred during the nighttime from the ground level to a height of at least 33 m over the commercial area. Measurement with a thermal camera showed that there were almost no differences in the surface skin temperature between the commercial and residential areas during the day and night. It is considered that these results are caused by the large thermal inertial associated with the large urban surface area, large building volume, and large heat capacity. These results were supported by numerical experiments with a multilayer urban canopy model. Unlike the temperature, there was almost no difference in the wet-bulb globe temperature between the commercial area and the park, resulting from higher humidity in the park.</p>

Journal

  • E-journal GEO

    E-journal GEO 14 (1), 180-196, 2019

    The Association of Japanese Geographers

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