NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
The 60th Japan National Congress for Theoretical and Applied Mechanics
Session ID : OS17-02
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OS17
The Time Evolution of Meso-scale Disturbances in the Atmosphere Caused by Frontal Instability
*Yasumitsu MaejimaKeita Iga
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Abstract
It is said that phenomena of developing disturbances along fronts in the atmosphere are frontal instability. In this study, we consider a basic field, which have both horizontal and vertical shear with a continuous stratification, modeled on the cross-section of the convergent cloud band over the winter Japan Sea. And we investigate the issue of how to change the horizontal scales or developing mechanism according to the characteristics of the basic field. The analysis methods are linear stability analysis on quasi-geostrophic system and calculations of nonlinear time evolution by non-hydrostatic numerical model "CReSS". In general, quasi-geostrophic system is not suitable in discussing disturbances which rapidly developed within one day. However, if they meet following conditions "absolute values of vorticity is larger than that of divergence" and "a stability of the atmosphere is large", quasi-geostrophic system can describe characteristics of such disturbances.
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© 2011 The Japan Society of Mechanical Engineers
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