On Surface Air Temperature Sections in Osaka City

In order to investigate the geographical distribution of surface air temperatures in Osaka City, moving observations by two automobiles with thermister electric thermometers were made from 20:00 on to 22:00 on Feb. 14, 1958. Two observation routes crossing each other at the heart of the city were taken : route A (north-south route, 20km) and the route B (east-west route, 18km). The temperatures at each observation point along the route were measured twice both on the way forth and back. The observed temperatures at different times were adjusted to those at 21:00 on each observation point, referring to the temperature records of continuous observation at the Osaka University of Liberal Arts Education, located almost at the center of the City. Using the arithmetical means of the two adjusted values for each point, the author made profiles of the temperature along the routes. During the observation period the north wind was blowing with the velocity ranging from 0.9 to 4.2msec. The following were concluded ; 1) High temperatures (about 5.0℃) were observed at Sennichimae, an amusement center in the South, and at Umeda, a bustling terminal in the North. These areas are densely builtup and have the heaviest motor traffic. 2) Low temperatures (about 2.0℃) were observed at the northern and the eastern extremities of the routes. These areas show typical rural landscapes and are far from the seacoast. 3) The western part of the route B shows higher temperatures (about 4.0℃ or more) influenced by the neighbouring sea. 4) The southern part of the route A shows less temperature than the northern and the eastern suburbs, because this area has less rural landscapes and is fairly influenced by the sea lying sea lying near to the west