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Radiosonde Observation of Planetary Waves in the Lower Atmosphere Over the Center China

LU Xian, ZHANG Shaodong   

  1. Department of Electronic Engineering, Wuhan University, Wuhan 430079
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-11-15 Published:2005-11-15

Abstract: 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.

Key words: Plasma measurement, Substorm, Magnetic dipolarization, Magnetic disturbance