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A diagnosis of warm-core and cold-core extratropical cyclone development using the Zwack–Okossi equation

Azad, Roohollah; Sorteberg, Asgeir
Peer reviewed, Journal article
Published version
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URI
https://hdl.handle.net/1956/6612
Date
2009
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  • Geophysical Institute [1009]
Original version
https://doi.org/10.1002/asl.244
Abstract
In this study, the development of a warm-core and cold-core extratropical cyclone over North Atlantic is examined. The geostrophic relative vorticity tendency used to diagnose the development is calculated utilizing the so-called extended form of the Zwack–Okossi development equation. In both cases, the cyclonic vorticity advection acted to develop the system, but warm-air advection (diabatic heating) made the largest contribution to explosive development in the cold-core (warm-core) case. Further, a vertical cross section of the temperature advection in the warm-core case reveals that the largest values of this contributor are located far and ahead of the cyclone center.
Publisher
Royal Meteorological Society and Wiley-Blackwell
Journal
Atmospheric Science Letters
Copyright
Copyright 2009 Royal Meteorological Society

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