Japan Geoscience Union Meeting 2022

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS27] Atmospheric electricity: Atmospheric electricity and climate change

Wed. May 25, 2022 1:45 PM - 3:15 PM 104 (International Conference Hall, Makuhari Messe)

convener:Yasuhide Hobara(Graduate School of Information and Engineering Department of Communication Engineering and Informatics, The University of Electro-Communications), convener:Kenkichi NAGATO(National Institute of Technology, Kochi College), Chairperson:Kenkichi NAGATO(National Institute of Technology, Kochi College), Yasuhide Hobara(Graduate School of Information and Engineering Department of Communication Engineering and Informatics, The University of Electro-Communications)

2:30 PM - 2:45 PM

[MIS27-04] Long-term increase of thunders in Tokyo and Kanazawa, Japan

*Masashi Kamogawa1, Suzuki Tomoyuki1, Masumi Zaiki2 (1.Global Center for Asian and Regional Research, University of Shizuoka, 2.Faculty of Economics, Seikei University)

Keywords:Thunder days, Temperature, lightning

The increase in temperature and lightning activity is widely known (Williams, Science, 1992). Therefore, long-term changes in the average temperature near the earth's surface and changes in lightning activity have become one of the topics of climate change research. The number of 'thunder days' (the total number of days of thunders detected by observers) observed by the Japan Meteorological Agency (Central Weather Bureau) at various weather stations has been recorded since the 1880s, and is still being observed (Kitagawa, JGR, 1989). Since the 1930s, the number of thunder days in the Hokuriku region has increased more than several times, which has been pointed out by many researchers. In this study, the number of thunder days in Tokyo (Edo) during the summer is investigated in order to examine the long-term variation in the number of thunder days for summer lightning in Japan. In order to investigate the cause of the long-term variation, we compared the temperature with the temperature of July in Edo reconstructed from the old diary (Zaijo & Mikami, Chigaku Zasshi, 2013) and the temperature measured by the instruments provided by the Japan Meteorological Agency (Central Weather Bureau). As a result, the number of thunder days increased with the increase in temperature over a long term, which suggests that the change in temperature is responsible for the increase in the number of thunder days. Next, in order to investigate the reason for the long-term increase in the number of thunder days during the winter lightning period in Kanazawa, sea surface temperature and high altitude meteorological data were examined. As a result, it was found that the increase in the number of thunder days was due to the fact that the environment in which the cumulonimbus clouds of winter thunderstorms are more readily formed is formed because of the long-term increase in sea surface temperature and decrease in the temperature at high altitudes.