岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

初夏に日本列島付近へ北上する台風の進路や周辺場の特徴について

濱本 奈津美
加藤 内藏進 岡山大学大学院教育学研究科自然教育学系理科教育講座
中山 祐貴
塚本 修 岡山大学大学院環境学研究科
抄録
The number of typhoons approaching the Japan Islands is much smaller in May and June than in August to September. However, some typhoons abnormally approach to the Japan Islands in May or June as in 2004. The present study investigated the characteristics of the typhoon tracks and the large-scale fields in May and June associated with the approach of typhoons to the Japan Islands. Climatologically speaking, typhoons are generally formed in the lower latitude in May and early June, and tend to turn to ENE-ward before they reach ~ 20N in May by the upper- and middle-level westerly wind. In June, the upper-level easterly wind associated with the Tibetan high seems to prevent typhoons from approaching to the Japan Islands. However, when the cell-type subtropical high and the deep westerly trough in its western side are formed with the SW-ly from the lower to the middle latitude, a favorable situation for the northward invasion of the typhoon can be realized in May. On the other hand, the formation of the barotropic-like subtropical high to the southeast of the Japan Islands seems to enable a typhoon to approach to the Japan Islands by the S-ly wind around the subtropical high.
キーワード
typhoon tracks in early summer
large-scale atmospheric fields in early summer
ISSN
1340-7414
NCID
AN10506284
NAID