THE CHANGE OF THE LOCAL TEMPERATURE DISTRIBUTION CAUSED BY THE PASSING OF COLD FRONT

Abstract

We observed the local temperature distribution on June 29 and 30, 1951 at some points of Kata-machi, Kakizaki-machi, Asahimura and Yoshika-wa-mura, Niigata Prefecture. The observed area is on the sand-dune which runs along the Japan Sea Coast, Its surface is almost covered by pine-groves and some parts are cleared or cultivated. Fig. 1, 2 and 3 are the temperature distribution maps. When we compare these maps with each other, we can find a similar type of isotherms between Fig. 1 and Fig. 2, especially at the area near the coast line. It is also approved by the statistical tests. So, we can conclude that the local temperature distribution after the passing of cold front resembles to that of the morning when the minium temperature occurs. After the passing of cold front, the temperature falls about 1°C on the coast, and about 2°C at the inland station on the sand-dune with the distance of 1 km from the coast (See Fig.4). It is considered to be the effect of the distribution of land and sea.