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

Hiroyuki KUSAKA, Kosuke IGARI, Reiko KOKUBO, Takuto SATO, Quang Van DOAN

doi:10.4157/ejgeo.14.180

<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>

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

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