%A LU Xian;ZHANG Shaodong
%T Radiosonde Observation of Planetary Waves in the Lower Atmosphere Over the Center China
%0 Journal Article
%D 2005
%J Chinese Journal of Space Science
%R 10.11728/cjss2005.06.529
%P 529-535
%V 25
%N 6
%U {http://www.cjss.ac.cn/CN/abstract/article_804.shtml}
%8 2005-11-15
%X Wind data by the radiosonde observation from Wuhan, Yichang, and Enshi Meteorological Stations in the period of 2001-2003 are used to analyze the Planetary Waves （PWs） in the lower atmosphere of the center China. L-S periodgrams show that quasi-16-day PWs and quasi-10-day PWs are dominating planetary wave components in the observed period over three sites. The largeamplitude oscillation of PWs can be observed primarily from 5 km to 15 km. The quasi-16-day PWs propagate westward with a zonal wave number of 2 （the horizontal wave length is 17 324.8 km）, and the corresponding phase velocity is estimated to be -12.5 m·s^-1 （positive eastward）. The vertical wavelength is estimated to be 25-30 km according to the phase variation with height below 10 km. The phases almost keep unchanged around the tropopause which indicates they may be stationary waves. Quasi-10-day PWs propagate eastward with a wave number of 4 （the horizontal wave length is 8627.3 km） and the corresponding phase velocity is estimated to be 10.0 m·s^-1, the vertical wave length is 22-40 km.