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《Chinese Journal of Atmospheric Sciences》 1994-01
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The Influence of the Time Mean Flow on the Formation of Dominant Oscillation of Wind in the Atmosphere

Guan Zhaoyong(Nanjing Institute of Meteorology, Nanjing 210044)Huang Shisong(Department of Atmospheric Sciences, Nanjing University, Nanjing 210008)  
Based on the horizontal mementum equations denoted by Fourier spectra coefficients, a relationtaking account of the vortical and divergent nature of the time mean now is obtained under certain conditions.The relation can be used to diagnose the influence of the non-uniform basic wind field on theformation of dominant oscillations of wind disturbance in the atmosphere.By using the ECMWF dayto day grid data of 1982, the frequency corresponding to the dominant oscillation in the wind field iscomputed from the relation.Thus, the global distributions of the frequencies are given at the lower,middle and upper levels in the troposphere.It is pointed out that there do exist the phenomena that thebasic wind field (time mean) could choose the oscillation with a certain frequency as the duminantoscillation in the atmosphere.
【CateGory Index】: P434
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