Synoptic and frontal-cyclone scale instabilities in baroclinic jet flows

From: Journal of the Atmospheric Sciences | Date: April 15, 1998| Author: | Copyright information

(Manuscript received 13 September 1996, in final form 8 September 1997)

ABSTRACT

Baroclinic instabilities of jet flows are investigated by means of numerical simulations of the nonhydrostatic Boussinesq equations on the f plane. Frontal small scales are accurately described thanks to precise numerical methods (mixed spectral-high-order finite differences). First, direct numerical simulations are used to carry out linear instability studies. The authors show the existence for a critical value of Ro/F = 1.5, under which baroclinic instability dominates (Ro and F are the Rossby and the Froude ...

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