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| Titel |
On quartet interactions in the California Current system |
| VerfasserIn |
L. M. Ivanov, C. A. Collins, T. M. Margolina |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 21, no. 4 ; Nr. 21, no. 4 (2014-08-29), S.887-900 |
| Datensatznummer |
250120936
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| Publikation (Nr.) |
 copernicus.org/npg-21-887-2014.pdf |
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| Zusammenfassung |
| Sea surface height (SSH) altimetry observations for 1992 to
2009 off California are used to show that observed quasi-zonal jets were
likely driven by near-resonance interactions between different scales of the
flow. Quartet (modulational) instability dominated and caused non-local
transfer of energy from waves and eddies to biannual oscillations and
quasi-zonal jets. Two types of quartets were identified: those composed of
scales corresponding to (a) quasi-zonal jets, annual and semiannual Rossby
waves and mesoscale eddies, and (b) biannual oscillations, semiannual Rossby
waves and mesoscale eddies. The spectral centroid regularly shifted into the
domain of low-order modes. However, the spectrum of SSHs does not demonstrate
a power behavior. This says that the classical inverse cascade is absent. For
a case with bottom friction, quartet instability required the existence of a
certain level of dissipativity in the flow. |
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