MEASUREMENT OF VERTICAL PHASE AND GROUP VELOCITIES OF ATMOSPHERIC GRAVITY-WAVES BY VHF RADAR

NCU Institutional Repository > 地球科學學院 > 大氣物理研究所 > 期刊論文 > Item 987654321/27367

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/987654321/27367

题名:	MEASUREMENT OF VERTICAL PHASE AND GROUP VELOCITIES OF ATMOSPHERIC GRAVITY-WAVES BY VHF RADAR
作者:	KUO,FS;LEE,KE;LUE,HY;LIU,CH
贡献者:	大氣物理研究所
关键词:	THUNDERSTORMS
日期:	1993
上传时间:	2010-06-29 18:37:06 (UTC+8)
出版者:	中央大學
摘要:	A systematic method of deriving from MST radar data the group velocity and phase velocity of the atmospheric wave along the radar beam direction is proposed and verified by a series of numerical simulations. We apply the method to two data sets measured by Chung-Li radar under different background wind conditions. It is found that the vertical group velocity and phase velocity are mostly in the opposite direction when the background wind is weak. The energy source of downgoing wave packets was evidently related to the instability in the upper height range (10.5 11.7 km) where strong wind shear existed. When the background wind and wind shear are stronger, the vertical group and phase velocities may propagate in the same direction. We also found from numerical simulation and data analysis that the wave packet of gravity waves following power law spectrum arc short-lived. A by-product of the group velocity measurement is that the horizontal wavelength may also be deduced from a vertical radar beam measurement from the dispersion relation if it is valid.
關聯:	JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS
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	609	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