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小氷期における東アジアの強風災害とその変動

Japanese (日本語)

地学雑誌

127(4)

513-529

東京地学協会

2018

2019-03-12

Climate variations in East Asia during the Little Ice Age are reconstructed using windrecords together with chronicles of weather disasters in Japan and China, as well as weatherobservations from Okinawa in the 1850s. The results of analyses are as follows: （1） On thebasis of numerous records that remain for the southern coast of Japan and the south-easterncoast of China, it appears that many rainstorm disasters occurred during the summer periodin both Japan and China. They usually took place one or two months later in Japan than inChina; （2） Observations in Naha show that, when air pressure drops considerably, wind speedis very high and its direction rotates. Following unusual air pressure falls in Naha, strong windscaused disasters in China or in Japan. It is thought that these events are linked to movementsof typhoons; （3） Increases in windstorm damage occurred during different periods in Japanand China. This may be related to changes in atmospheric circulation. Cool summer periods areobserved around 1705, 1740, 1765, 1785, 1830, and 1845. The year 1855 marks a turning pointbetween periods with prevailing cool states and periods with prevailing warm states.

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