Yoshiki Yokawa

Spacial and temporal change of climatic zones in Chubu region

Toshiro Kumakura

Generally, climate is defined as "average atmospheric conditions over a sufficiently long period of time".(Ministry of Education,2013) As for the current status of the mid-climate classification, research on climate change has been reported by many researchers, and a new classification method called cluster analysis has been implemented. However, No authentic reserch has been conducted on the changes in the mid-climate classification of the target area or how the regional climate changes. And it is thought that they can be easily evaluated in the process of classifying climatic regions used in Takeshi Sekiguchi's climate classification.
For the analysis, we used the latest data from 1989 to 2018 to calculate climate categories, and used them to consider regional and temporal climate. Regional considerations used a 30-year average climate classification. For the data used for analysis, six types (average temperature, average daily maximum temperature, average daily minimum temperature, total prepicitation, daily precipitation 1mm or more, sunshine duration) of items were downloaded monthly from the Japan Meteorological Agency.
As a result, it was classified into two types in the annual variation type of the daily range of temperature, the number of days of precipitation, and the sunshine rate. However, the excess water content was classified into seven types by being classified into plural types in the Central Highlands and the Pacific Ocean side. According to the annual variation classification of each element, 151 weather stations can be classified into 63 types of climatic patterns, and it is found that various features appear at the granularity of moderate climate.
As for the transition of the 10-year average, which is the temporal climate, the transition of the monthly average temperature in January and August indicates that the temperature is low in winter in 2009-2018 and high in summer in 2009-2018, and the annual temperature difference is large. In addition, the area where the temperature is relatively high in the entire target area is increasing from the average temperature every 10 years. The average temperature at all points was found to be rising, especially from 1989-1998 to 1999-2008.