大尺度行星波跨赤道传播的E-P通量诊断

E-P FLUX DIAGNOSIS FOR CROSS-EQUATOR PROPAGATION OF LARGE-SCALE PLANETARY WAVES

利用Nimbus－7卫星温度探测资料，计算了平流层和中间层的风场、位势高度扰动场，进行了行星波E－P通量分析．结果表明，中层大气中的准定常行星波，其定常分量不能跨过赤道上空的零风线，由于其幅度的起伏和相位的变化，激发的瞬变行星波分量不受赤道零风线的限制，可以从冬半球向夏半球传播，也可以从夏半球向冬半球传播．这种跨赤道传播为夏半球行星波的能量来源提供了一种解释．

Using Ndrius-7 sateilite grid temperature data, the mean wind and gcopotential disturbution are caiculated and E-P flux are analysed in stratosphere and mesosphere.The results show that the stationary part of the quasi-stationary plancetary waves in middle atmosphere may not propagate across the zero wind line. The transient planeary waves are stimulated due to the amplitude fluctuation and phase variation of the quasi stationary planetary waves. They are not confined by the an wind line and can propagate across the Nuator from winter-hemisphere to summer-hemisphere or from summer-hemisphere to winter-hemisphere. The cross-equator propagation provide an explanation for the energy source of the planetary waves in summer hemisphere.