A diagnosis of warm‐core and cold‐core extratropical cyclone development using the Zwack–Okossi equation
2009; Wiley; Volume: 10; Issue: 4 Linguagem: Inglês
10.1002/asl.244
ISSN1530-261X
AutoresRoohollah Azad, Asgeir Sorteberg,
Tópico(s)Meteorological Phenomena and Simulations
ResumoAbstract 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. Copyright © 2009 Royal Meteorological Society
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