ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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Characteristics of Barolicnic Wave Packets in GCM Data

WANG Minghuai, TAN Benkui   

  1. Department of Atmospheric Sciences of School of physics, Peking University, Beijing, 100871
  • Received:2002-03-14 Online:2003-01-20 Published:2003-01-20

Abstract: 300hpa meridional wind data from a GCM experiment in GFDL were analyzed to document the characteristics of wave packets in GCM data. Utilizing the one-point lag correlation and the complex demodulation, authors computed some characteristic variables of wave packets. Results show that the wavelength is a few thousand kilometers. The phase speed is about 10m/s, and the group speed is about 2~3 times of the phase speed. It also shows that the downstream development of baroclinic wave in GCM data is more popular than that in the observational data, and that wave packets in GCM data are more coherent.