Abstract
In this study, the fixed point observation of surface air temperature was carried out during the summer in Kumagaya City, Saitama Prefecture. Furthermore, diurnal variation patterns of the heat island intensity were extracted from observed data by a multivariate analysis. As a result, the daily maximum of heat island intensity appeared in the daytime (about 4℃) when suburban stations were selected in the paddy field, but in the nighttime (about 3℃)in the case of the forest area. This suggests that the selection of suburb stations can have a strong influence on the interpretation of heat island intensity. In addition, the component referred to the inhomogeneity of diurnal temperature variation in the suburbs was obtained by principal component analysis. Therefore, it became clear that the diurnal variation of the heat island intensity in Kumagaya City greatly depends on the land cover status.
