Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
Wave-Momentum Diagnosis On Various Development Mechanisms Of Baroclinic Waves In The Eady Problem
Izuru Takayabu
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1993 Volume 71 Issue 4 Pages 503-515

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Abstract

To understand various development mechanisms of disturbances in the Eady problem, the quasigeostrophic equation system is extended to include the horizontal boundary conditions. First, we distinguish continuous-spectrum waves from the modal waves by using potential vorticity. Next, we derive the "wave momentum" and clarify its relationship with the Eliassen-Palm flux. Finally, the necessary condition for the development of waves in the baroclinic flow is expressed by evaluating the EP-flux divergence. In Farrell (1984) or Thorncroft and Hoskins (1990), shallow vortices develop algebraically, as the result of wave-wave interaction of a boundary modal wave and internal continuous-spectrum waves. These interactions are clearly indicated by the EP-flux convergence around the critical level.

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