The long-term changes in the snowfall of the three districts over northern Japan, the Hokkaido, Tohoku, and Hokuriku districts, were investigated by analyzing the increasing and decreasing trends for the number of snow days during the 1962–2020 winters. Statistically significant increasing trends were recognized in the Sea of Japan side of the Hokkaido district, the northernmost region, in seasonal timescale. On the other hand, the statistically significant decreasing trends were recognized in the Hokuriku district and the Pacific side of the Tohoku district located in the south. Many stations showed a statistically significant decreasing trend around the beginning and end of winter. The mean surface air temperature during precipitation days had a statistically significant increasing trend in November, February, and March at most of the stations in Northern Japan. Whether the area is along the Sea of Japan or other oceans, whether the area is the windward or leeward side to monsoon northwesterlies, and the climatological surface air temperature are considered to play a role in the regional characteristics of the long-term changes in the number of snow days over the Hokkaido district and among the three districts.
雑誌名
Geographical reports of Tokyo Metropolitan University
巻
57
ページ
63 - 70
発行年
2022
ISSN
03868710
書誌レコードID
AA00200173
著者版フラグ
publisher
出版者
Department of Geography Tokyo Metropolitan University
Long-term changes in the snow days over northern Japan
20005-057-008.pdf
(800.62KB)
