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| Titel |
On the unstable mode merging of gravity-inertial waves with Rossby waves |
| VerfasserIn |
J. F. McKenzie |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 8 ; Nr. 29, no. 8 (2011-08-19), S.1377-1381 |
| Datensatznummer |
250017072
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1377-2011.pdf |
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| Zusammenfassung |
| We recapitulate the results of the combined theory of
gravity-inertial-Rossby waves in a rotating, stratified atmosphere.
The system is shown to exhibit a "local" (JWKB) instability
whenever the phase speed of the low-frequency-long wavelength
westward propagating Rossby wave exceeds the phase speed ("Kelvin"
speed) of the high frequency-short wavelength gravity-inertial wave.
This condition ensures that mode merging, leading to instability,
takes place in some intermediate band of frequencies and wave
numbers. The contention that such an instability is "spurious" is
not convincing. The energy source of the instability resides in the
background enthalpy which can be released by the action of the
gravitational buoyancy force, through the combined wave modes. |
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