摘要
通过引进无量纲动力学参数μ=fK_(y)/fK_(z),研究了非静力平衡模式中重力惯性波的特征。发现:由于地球自转角速度水平分量的影响,中高纬地区与低纬地区重力惯性波的频谱、传播特征和结构都有着明显的差异;详细讨论了波的色散关系,指出:在一定的不稳定大气层结下,存在着重力惯性波不稳定发展的临界波长,波长略长于该临界波长的低频重力惯性波,在水平方向传播时可以向波的下游频散能量,从而激发起新的波动。它们和雷暴高压:飑线等一类强对流天气的特征和结构颇为相似。
By means of a nou-dimensional dynamic parameterμ=fK_(y)/fK_(z),an analysis of the inertio-gravitational wave characteristic is performed for a modified nouhydrostatic equilibrium model.The frequency spectra,propagation feature and structure of this wave in middle-high and lower latitudes are dispussed and compared.There is a critical wavelength for the instable stratification inertio-gravitational waves with wave length shorter than which are instable,on the other hand,somewhat longer waves of low frequency than which can disperse the energy ahead of its propagation,then excite new waves.It is shown that one must use entire nou-hydrostatic model which contain/term in the investigation of local strong convection and of lower latitude mesoscale numerical forecast.
作者
肖永生
Xiao Yong-sheng(Meteorological Institute Of Anhui Province)
出处
《气象学报》
1982年第4期417-429,共13页
Acta Meteorologica Sinica
