Various types of unstable disturbances are examined in this chapter. We discuss the motions and structures of unstable disturbances superimposed on a balanced state of the atmosphere. These are in contrast to the neutral disturbances considered in the previous chapter. We examined the condition for the instability of balanced states of atmospheric motions in Chapter 2, in which the main interest revolved around the characteristics of balanced states. In this chapter, however, we mainly consider the properties of unstable disturbances. The structures of unstable disturbances will be investigated using linear stability analysis in this chapter.
KeywordsRayleigh Number Potential Temperature Rossby Wave Potential Vorticity Phase Speed
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