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| Titel |
Interaction between dynamics and thermodynamics during tropical cyclogenesis |
| VerfasserIn |
S. Gjorgjievska, D. J. Raymond |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 6 ; Nr. 14, no. 6 (2014-03-27), S.3065-3082 |
| Datensatznummer |
250118528
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| Publikation (Nr.) |
 copernicus.org/acp-14-3065-2014.pdf |
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| Zusammenfassung |
Observational data of tropical disturbances are analyzed in order to
investigate tropical cyclogenesis. Data from 37 cases observed during three
field campaigns are used to investigate possible correlations between various
dynamic and thermodynamic variables. The results show that a strong mid-level
vortex is necessary to promote spin up of the low-level vortex in a tropical
cyclone. This paper presents a theory on the mechanism of this process. The
mid-level vortex creates a thermodynamic environment conducive to convection
with a more bottom-heavy mass flux profile that exhibits a strong positive
vertical gradient in a shallow layer near the surface. Mass continuity then
implies that the strongest horizontal mass and vorticity convergence occurs
near the surface. This results in low-level vortex intensification.
For two of the disturbances that were observed during several consecutive
days, evolution of the dynamics and thermodynamics is documented. One of
these disturbances, Karl, was observed in the period before it intensified
into a tropical storm; the other one, Gaston, was observed after it
unexpectedly decayed from a tropical storm to a tropical disturbance. A
hypothesis on its decay is presented. |
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