1997 Volume 52 Issue 4 Pages 207-221
In order to clarify the relationship between air temperature distribution and house density, for the late evening, early morning and daytime, mobile observation using car installed thermistor thermometer was carried out 20 times from January 1 to August 29 in 1994. The results obtained are summarized as follows: (1) The area of the highest temperature was found in the vicinity of Toyohashi Station, the central part of Toyohashi City. The area of cool temperature was distributed outside the city except the western suburbs facing the Mikawa Bay coast. (2) The heat island was formed more strikingly under the condition with strong surface inversion than without inversion. (3) When the prevailing wind velocity was 1.1 to 3.0 m/sec, the warmest part in the temperature distribution sifted slightly leeward. With the wind velocity of more than 6.1 m/sec, there was no temperature difference in and outside the city. (4) The relationship between the city temperature and the house density, an indicator of human activity, was examined in accordance with the prevailing wind. It was made clear that regional differences in the temperature distribution were mainly caused by the prevailing wind direction; namely the region is located whether the windward or leeward sector of the central part of the city. The regression equations between the house density and the temperature anomaly from areal average at every observation point are similar in early morning and late evening.