DOI: 10.1002/joc.5910
Scopus记录号: 2-s2.0-85058853276
论文题名: Influential role of inter-decadal explosive cyclone activity on the increased frequency of winter storm events in Hokkaido, the northernmost island of Japan
作者: Tsukijihara T. ; Kawamura R. ; Kawano T.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2019
卷: 39, 期: 3 起始页码: 1700
结束页码: 1715
语种: 英语
英文关键词: climate regime shift
; explosive cyclone
; Rossby wave propagation
Scopus关键词: Explosives
; Mechanical waves
; Moisture
; Ocean currents
; Tropics
; Wave propagation
; Climate regime shift
; Composite analysis
; Extratropical cyclones
; Heavy precipitation
; In-situ observations
; Moisture flux convergences
; ROSSBY wave propagation
; Upper-level trough
; Storms
英文摘要: This study examined explosively developing extratropical cyclone activity in the vicinity of Japan in boreal winter from 1979/1980 to 2016/2017 mainly using the Japanese 55-year Reanalysis data. The in situ observation and reanalysis data revealed increased frequencies of both strong winds and heavy precipitation in Hokkaido, the northernmost island of Japan, after the end of the last century, which is consistent with the fact that the cyclones migrating along the Kuroshio Current (KC cyclones) have tended to approach the Hokkaido region in recent years. To examine factors controlling the cyclone track and rapid development, we performed composite analyses of the northwards migrating type (N type) and eastwards migrating type (E type) KC cyclones. In the N-type cyclone, wave trains prevailed along the polar front and subtropical jets over the Eurasian continent, thereby forming an upper-level trough (ridge) to the west (east) of the cyclone. An upper-level divergence accompanied by rapid development of the N-type cyclone excited wave packets downstream as a Rossby wave source, leading to further reinforcement of the upper-level ridge east of the cyclone. The anomalous anticyclone with a barotropic nature is capable of forcing the cyclone track to shift northwards. Furthermore, a combination of the N-type cyclone and the anomalous anticyclone to its east facilitates moisture import into the cyclone system from lower latitudes, contributing to enhanced moisture flux convergence. In reality, diabatic heating in the vicinity of the cyclone centre is larger in the N-type cyclone than in the E-type one. It is also suggested that the pronounced Rossby wave propagation along the subtropical jet related to a climate regime shift in the Tropics is responsible for the recent increase in the number of N-type cyclones. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116514
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka, Japan
Recommended Citation:
Tsukijihara T.,Kawamura R.,Kawano T.. Influential role of inter-decadal explosive cyclone activity on the increased frequency of winter storm events in Hokkaido, the northernmost island of Japan[J]. International Journal of Climatology,2019-01-01,39(3)