Dual-Doppler-Derived Profiles of the Southwesterly Flow Associated with Southwest and Ordinary Typhoons off the Southwestern Coast of Taiwan

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题名:	Dual-Doppler-Derived Profiles of the Southwesterly Flow Associated with Southwest and Ordinary Typhoons off the Southwestern Coast of Taiwan
作者:	Yu, Cheng-Ku Cheng, Lin-Wen
贡献者:	大氣系
关键词:	OROGRAPHIC PRECIPITATION TROPICAL CYCLONE MINDULLE 2004 RADAR OBSERVATIONS BOUNDARY-LAYER HEAVY RAINFALL PART I LANDFALL TRANSITION SIMULATION
日期:	2014-09
上传时间:	2015-01-20 15:45:54 (UTC+8)
摘要:	This study used ground-based dual-Doppler observations to explore an understanding of kinematic characteristics of the southwesterly flow associated with the southwest (SW) and ordinary (OR) typhoons immediately off the southwestern coast of Taiwan. The SW (OR) typhoon stated herein is referred to as a typhoon with (without) an obvious combination of its outer circulations and the summer southwesterly monsoon active over the South China Sea. Six typhoon events [Mindulle (2004), Kalmaegi (2008), Morakot (2009), Talim (2005), Jangmi (2008), and Fungwong (2008)] were chosen for analysis; the first (latter) three listed belong to the family of the SW (OR) typhoons. The vertical profiles generated from hourly synthesized winds for these typhoons indicate that intense orographic rainfall tended to occur during the prevalence of the west-southwesterly (WSW) flow that was more perpendicular to the south north orientation of the topography in southern Taiwan. A unique, consistent feature of the WSW flow associated with the SW typhoon was its persistently increasing intensity with decreasing height in the low to midtroposphere, in contrast to a minor vertical variation in the intensity of the WSW flow for the OR typhoon. A relatively large (small) ratio of the radial and tangential velocities was evident for the SW (OR) typhoon, and the mean inflow angle of the SW typhoon was significantly larger than the typical near-surface inflow angle of previously documented hurricanes over the open ocean. In addition to the typhoon background precipitation, the observed characteristics of the SW- and OR-typhoon-induced WSW flow were shown to be closely related to the degree of orogaphic enhancement of precipitation.
關聯:	JOURNAL OF THE ATMOSPHERIC SCIENCES 卷: 71 期: 9 頁碼: 3202-3222
显示于类别:	[大氣系所] 期刊論文

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