1986 Fiscal Year Final Research Report Summary

Regionality of weather distribution in Japan

Research Project

Project/Area Number	60580196
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	自然地理学
Research Institution	Institute of Geoscience, University of Tsukuba
Principal Investigator	KAWAMURA Takeshi Institute of Geoscience, University of Tsukuba, 地球科学系, 教授 (20111362)
Project Period (FY)	1985 – 1986
Keywords	climate of Japan / Dynamic climatology / synoptic climatology / 天気の局地性 / 気候区分
Research Abstract	Winter climate of Japan is strongly affected by winter monsoon. It results the cold temperature and heavy snow on the Japan Sea side and the cold dry and fine weather on the Pacific Ocean Side of Japanese Islands. Location af weather divide has changed by the direction of air flow and effect of topography. Then the purpose of this study is to make the regional division of weather and local winds related to the winter monsoon. Firstly, the distribution maps of the percentage frequency of precipitation amount over 1mm/day, 5mm/day, 10mm/day and 20mm/day were made for each flow type decided by gradient wind direction at 850mb level. In order to subdivide the climatic region with regard to weather, the following isolines of percentage frequency were noted; 10% and 90% in maps over 1mm/day and 5mm/day and so on. On the other hand regional division by local wind was attempted. Especially, air shed of the local winds and the location of the area of strong and calm winds were clearly divided.

(4 results)