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

NCUIR > College of Earth Sciences > Department of Atmospheric Sciences and Graduate Institute of Atmospheric Physics > journal & Dissertation > Item 987654321/27367

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Title:	MEASUREMENT OF VERTICAL PHASE AND GROUP VELOCITIES OF ATMOSPHERIC GRAVITY-WAVES BY VHF RADAR
Authors:	KUO,FS;LEE,KE;LUE,HY;LIU,CH
Contributors:	大氣物理研究所
Keywords:	THUNDERSTORMS
Date:	1993
Issue Date:	2010-06-29 18:37:06 (UTC+8)
Publisher:	中央大學
Abstract:	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.
Relation:	JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS
Appears in Collections:	[Department of Atmospheric Sciences and Graduate Institute of Atmospheric Physics ] journal & Dissertation

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