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Hokkaido University Collection of Scholarly and Academic Papers >
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Moisture Supply, Jet, and Silk-Road Wave Train Associated with the Prolonged Heavy Rainfall in Kyushu, Japan in Early July 2020
| Title: | Moisture Supply, Jet, and Silk-Road Wave Train Associated with the Prolonged Heavy Rainfall in Kyushu, Japan in Early July 2020 |
| Authors: | Horinouchi, Takeshi Browse this author →KAKEN DB | | Kosaka, Yu Browse this author →KAKEN DB | | Nakamigawa, Hiroshi Browse this author | | Nakamura, Hisashi Browse this author →KAKEN DB | | Fujikawa, Norihisa Browse this author | | Takayabu, Yukari N. Browse this author →KAKEN DB |
| Issue Date: | 1-Jun-2021 |
| Publisher: | 公益社団法人 日本気象学会 (Meteorological society of Japan) |
| Journal Title: | SOLA (Scientific Online Letters on the Atmosphere) |
| Volume: | 17B |
| Start Page: | 1 |
| End Page: | 8 |
| Publisher DOI: | 10.2151/sola.2021-019 |
| Abstract: | A prolonged heavy rainfall event occurred in Kyushu in early July 2020. Its large-scale environmental factors are investigated with observational and reanalysis data. Seven-day precipitation and moisture flux convergence around Kyushu were the greatest among the last 30 years. This pronounced convergence was maintained by nearly steady moisture influx, and the persistent upper-level trough to the northwest enhanced the ratio of moisture convergence to the influx. The magnitude of instantaneous moisture flux, however, was not particularly large among those along the subtropical jet axis or the Meiyu-Baiu rainband. What made this event unique is the persistence of the moisture flux peak anchored around Kyushu under the influence of the Silk-Road teleconnection. In June 2020, three upper-level troughs, whose easternmost one corresponding to the aforementioned trough, tend to form along the subtropical Asian jet. This wave train was persistent in the month and lasted until mid-July, 2020. Our analysis suggests that, prior to the rainfall event, the Silk-Road teleconnection was intensified through an interaction with a wave train at subpolar latitudes, which involves nonlinear processes including trough cut-off. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82917 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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