The Absolute Angular Momentum Budget of an Extratropical Cyclone: Quasi-Lagrangian Diagnostics 3

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  • 1 Department of Meteorology, University of Wisconsin, Madison, 53706
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Abstract

The transport and budget formulations developed for a translating system are used to study the mass and absolute angular momentum budgets of a Midwest cyclone. Using isentropic coordinates a mass circulation is isolated which transports angular momentum into the lower half of the tropospheric vortex and out of the upper half during the cyclone’s development and maturation. The occlusion process, characterized by the vertical development of the cyclone vortex into the middle and upper troposphere, occurred through a redistribution of angular momentum by an upward transport of angular momentum associated with the diabatic release of latent heat and an upward redistribution by internal pressure torques.

Abstract

The transport and budget formulations developed for a translating system are used to study the mass and absolute angular momentum budgets of a Midwest cyclone. Using isentropic coordinates a mass circulation is isolated which transports angular momentum into the lower half of the tropospheric vortex and out of the upper half during the cyclone’s development and maturation. The occlusion process, characterized by the vertical development of the cyclone vortex into the middle and upper troposphere, occurred through a redistribution of angular momentum by an upward transport of angular momentum associated with the diabatic release of latent heat and an upward redistribution by internal pressure torques.

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