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| Titel |
Diffusive draining and growth of eddies |
| VerfasserIn |
S. Balasuriya, C. K. R. T. Jones |
| 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 ; 8, no. 4/5 ; Nr. 8, no. 4/5, S.241-251 |
| Datensatznummer |
250005297
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| Publikation (Nr.) |
 copernicus.org/npg-8-241-2001.pdf |
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| Zusammenfassung |
| The diffusive effect
on barotropic models of mesoscale eddies is addressed, using the Melnikov
method from dynamical systems. Simple geometric criteria are obtained,
which identify whether a given eddy grows or drains out, under a diffusive
(and forcing) perturbation on a potential vorticity conserving flow.
Qualitatively, the following are shown to be features conducive to eddy
growth (and, thereby, stability in a specific sense): (i) large radius of
curvature of the eddy boundary, (ii) potential vorticity contours more
tightly packed within the eddy than outside, (iii) acute eddy pinch-angle,
(iv) small potential vorticity gradient across the eddy boundary, and (v)
meridional wind forcing, which increases in the northward direction. The
Melnikov approach also suggests how tendrils (filaments) could be formed
through the breaking of the eddy boundary, as a diffusion-driven advective
process. |
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