Spatial Average and Variation of Radiation and Temperature within a Street Canyon:

Case Study in the City Area around Shinjyuku Gyoen Park

Abstract

Urban aera is an aggregation of various sizes and shapes of buildings. So radiation and temperature fields within urban street canyon are very complicated. In this study, spatial average and variation of air temperature, road surface temperature, solar radiation and downward long wave radiation were measured around Shinjyuku Gyoen Park by automobile moving observations. The variation of air temperature along streets amounted to 1°C as a standard deviation, and its average is largely different from rooftop temperature and nearest routine observation data. And surface temperature of automobile was also analyzed. The engine room has extremely high temperature even during night, while roof surface was getting cold rapidly than road surface in the evening because of its small thermal capacity.