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The kinetic and available potential energy budget of a winter extratropical cyclone system Cover

The kinetic and available potential energy budget of a winter extratropical cyclone system

Open Access
|Jan 1986

Abstract

The energy budget of an extratropical cyclone system which traversed North America and intensified through the period 9–11 January 1975 is presented. The objectives of the study are (1) to document the complete energy budget of a significant winter cyclone event, and (2) to comment on the significance of latent heat release (LHR) in the cyclone’s evolution. Results reveal an overall increase in both kinetic (K) and available potential energy (A). K increases are accounted for by boundary flux convergence of K, while A increases are due to generation by LHR and K to A conversion. In addition, the general A increase is accompanied by a 24 h oscillation that is explained largely by the flux quantity in the A budget equation and is correlated with a similar fluctuation in the K to A conversion.

LHR does not appear to be critical in the development of this cyclone system. Rather, LHR acts to increase the intensity of the event. It is hypothesized that the direct influence that LHR had on the deepening cyclone’s reduced mass was augmented by an indirect influence, in which pre-existing dry dynamical forcing was enhanced by diabatic heating, thus leading to accelerated cyclone development at a later time.

Language: English
Page range: 49 - 59
Submitted on: Dec 11, 1984
Accepted on: Apr 17, 1985
Published on: Jan 1, 1986
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 1986 Phillip J. Smith, Patricia M. Dare, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.