Momentum Budget Evolution of Typhoon Nari (2001) During the Landfall Process

NCU Institutional Repository > 地球科學學院 > 大氣物理研究所 > 期刊論文 > Item 987654321/50378

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50378

题名:	Momentum Budget Evolution of Typhoon Nari (2001) During the Landfall Process
作者:	Yang,MJ;Wang,TCC;Zhang,Y;Weng,CY
贡献者:	大氣物理研究所
关键词:	HURRICANE-ANDREW 1992;TROPICAL CYCLONES;TAIWAN OROGRAPHY;PRECIPITATION;SIMULATION;MODEL
日期:	2011
上传时间:	2012-03-27 17:30:24 (UTC+8)
出版者:	國立中央大學
摘要:	In order to understand the evolution of tangential and radial flows of Typhoon Nari (2001) during its landfall in Taiwan, absolute angular momentum (AAM) and radial wind budgets of Nari are conducted by analyzing the MM5 simulation results with high spatial and temporal resolutions (2-km horizontal grid spacing and 2-min output interval). The AAM is nearly conserved outside the eyewall and above the boundary layer while Nari is over the ocean; after landfall, the enhanced surface friction and turbulent mixing produces mostly negative local tendencies of AAM above terrain. For the landfall storm, both the radar observation and model simulation indicate that the radial inflows at lower levels become thicker and stronger over land, and the sloping radial outflow jet is maximized at the midlevel above rugged topography. The midlevel radial outflows result from supergradient accelerations of 20 - 35 m s(-1) h(-1) and supergradient winds of 5 - 9 m s(-1). The enhanced imbalance accelerations imply that the gradient wind balance is no longer appropriate to describe tangential winds over terrain. Near the eyewall, the supergradient winds can be as strong as 9 m s(-1) above terrain and subgradient winds up to -21 m s(-1) are found at the surface on the lee side. The stronger force imbalances of the landfall Nari produce larger local changes of AAM and radial momentum, leading to more quickly-evolved vortex flows and secondary circulations over Taiwan's steep terrain.
關聯:	TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
显示于类别:	[大氣物理研究所 ] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	745	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....