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| Titel |
Experiments on transitions of baroclinic waves in a differentially heated rotating annulus |
| VerfasserIn |
Th. Larcher, C. Egbers |
| 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 ; 12, no. 6 ; Nr. 12, no. 6 (2005-12-20), S.1033-1041 |
| Datensatznummer |
250010905
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| Publikation (Nr.) |
 copernicus.org/npg-12-1033-2005.pdf |
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| Zusammenfassung |
| Experiments of baroclinic waves in a rotating, baroclinic annulus of fluid are presented for two gap
widths. The apparatus is a differentially heated cylindrical gap, rotated around its vertical
axis of symmetry, cooled from within, with a free surface, and filled with de-ionised water as
working fluid. The surface flow was observed with visualisation technique while thermographic
measurements gave a detailed understanding of the temperature distribution and its
time-dependent behaviour.
We focus in particular on transitions between different flow regimes. Using a wide gap, the
first transition from axisymmetric flow to the regular wave regime was characterised by complex flows.
The transition to irregular flows was smooth, where a coexistence of the large-scale
jet-stream and small-scale vortices was observed. Furthermore, temperature measurements showed
a repetitive separation of cold vortices from the inner wall. Experiments using a narrow gap
showed no complex flows but strong hysteresis in the steady wave regime, with up to five
different azimuthal wave modes as potential steady and stable solutions. |
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