|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
Peer-reviewed Journal Articles, etc >
Multiple Dynamics of Precipitation Concentrated on the North Side of Typhoon Hagibis (2019) during Extratropical Transition
| Title: | Multiple Dynamics of Precipitation Concentrated on the North Side of Typhoon Hagibis (2019) during Extratropical Transition |
| Authors: | Yanase, Wataru Browse this author →KAKEN DB | | Araki, Kentaro Browse this author →KAKEN DB | | Wada, Akiyoshi Browse this author →KAKEN DB | | Shimada, Udai Browse this author →KAKEN DB | | Hayashi, Masahiro Browse this author | | Horinouchi, Takeshi Browse this author →KAKEN DB |
| Keywords: | tropical cyclone | | extratropical transition | | cloud resolving simulation |
| Issue Date: | Oct-2022 |
| Publisher: | 公益社団法人 日本気象学会 (Meteorological society of Japan) |
| Journal Title: | Journal of the Meteorological Society of Japan |
| Volume: | 100 |
| Issue: | 5 |
| Start Page: | 783 |
| End Page: | 805 |
| Publisher DOI: | 10.2151/jmsj.2022-041 |
| Abstract: | Torrential rain in Typhoon Hagibis caused a devastating disaster in Japan in October 2019. The precipitation was concentrated in the northern half of Hagibis during extratropical transition (ET). To elucidate the mechanisms of this asymmetric precipitation, synoptic- and mesoscale processes were mainly analyzed using the Japan Meteorological Agency Non-Hydrostatic Model. The present study demonstrates that the asymmetric processes were different depending on the ET stages. When Hagibis was close to the baroclinic zone at middle latitudes on around 12 October (the frontal stage), heavy precipitation in the northeastern part of Hagibis was attributed to warm frontogenesis and quasigeostrophic ascent, as reported in many previous studies. In contrast, when Hagibis was moderately distant from the baroclinic zone on around 11 October (the prefrontal stage), heavy precipitation in the northern part occurred in a slantwise northward ascending motion in the outer region. This slantwise motion developed in a region with strong westerly vertical shear, which was enhanced between Hagibis and a westerly jet stream. Based on the analyses of potential vorticity and absolute angular momentum, this region was characterized by reduced moist symmetric stability in the lower and middle troposphere accompanied by inertial instability in the upper troposphere and conditional instability in the lower troposphere. These results provide additional insights into the time evolution of asymmetric processes during ET in the absence of a distinct upper-tropospheric trough, particularly, the slantwise motion in the prefrontal stage. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/88498 |
| 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)
|
|
