近世以降の土地利用変化に起因するローカルな気候変動

数値シミュレーションによるアプローチ

抄録

LUIS (Land Use Information System) is a digital land use data set covering all Japan with 2 km grid. The land use on each grid point in circa 1850, circa 1900, circa 1955 and circa 1985 were compiled in LUIS. By the numerical simulations with a mesoscale model referring to LUIS, the author attempted to pick up the influence on near surface air temperature by regional warming related with land use change during around 135 years.
During 4 periods, the area showing the regional warming related with land use change has expanded. This feature was significant around Tokyo and Osaka. The maximum difference between circa 1850 and circa 1985 emerged at 9PM and the minimum emerged at 6AM. The former was 1.8 Celsius degrees in Tokyo (Otemachi).
Urbanization during 4 periods weakened the daytime penetration of sea breeze in south Kanto and it brought a regional warming. The warming area moved to north with expanding on the Kanto Plain by sea breeze since daytime to mid-night. But an effect of recovery of forest in the mountainous area in central Japan was not clear. In Osaka Plain the movement of warming area by sea breeze was smaller than in Kanto Plain.