Changes in meteorological environment by development of motooka, fukuoka pref. (2) - Original situation before development -

Motooka district is scheduled to be a new campus for Kyushu University. We have been conducting meteorological observations to obtain the data that evaluate the environmental change over the future development since June 1994. In the present study, we compared meteorological data of Motooka (from June 1994 to December 1999) obtained with those of urban area to clarify the differences of climates between both areas. The original condition before the urbanization in Motooka was approximately 1.5°C lower than Fukuoka the year round. While the maximum air temperature in Motooka was nearly equal to Fukuoka in winter and lower about 1°C in summer, the minimum air temperature in Motooka was 2-4°C lower than Fukuoka both in summer and winter. The trend of the absolute humidity in Motooka increased every year. In last 3 years, it exceeded about 4g/m³ than Fukuoka in summer season. This difference of humid condition between Motooka and Fukuoka should be brought by the differences of ground surface between both areas. The data suggests that the less conversion of solar radiation into latent heat in urban area causes the high temperature in summer daytime.