摘要:
文中对谱点的分布作了定性分析和数值计算。结果发现:当基流存在切变时,无论是重力惯性波还是涡旋波都存在连续谱。在通常的环境下,对天气尺度的扰动,3支波动的连续谱不重叠,3支波动明显可分;当扰动尺度小于临界波长l0时,可出现涡旋波和一支重力惯性波的两波连续谱区的重叠,当扰动尺度小于l0/2时,可出现涡旋波和一对重力惯性波的三波连续谱区的重叠,此时两种波动不可分。当出现重叠谱时,若出现不稳定扰动,其频率的实部落在重叠谱区。
Abstract:
This paper is the first part of characteristic wave of transversal disturbance at baroclinic shear basic flow. The distribution of spectrum point is studied. The results show that, when the wind shear of basic flow is not zero, there exists continuous spectrum of gravitational inertial wave and vortex wave. Under usual circumstances, to synoptic scale, the continuous spectrum area of this three waves (that is distinct separated) are not overlap. When the disturbance scale is smaller than the critical scale lo, there exists a overlap of the continuous spectrum area of two waves (vortex wave and a gravitational inertial wave),and when it is smaller than l0/2, there exists a overlap of the continuous spectrum area of three wave (vortex wave and both gravitational inertial waves).This two kind of waves can not be separated at this moment, if the disturbance is instable, the real part of this frequency is in the overlap spectrum area while there appears overlap spectrum.
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