von Larcher, T. and Egbers, C.
(2005)
*Experiments on transitions of baroclinic waves in a differentially heated rotating annulus.*
Nonlinear Processes in Geophysics, 12
.
pp. 1033-1041.
ISSN 1023-5809 (Print); 1607-7946 (Online)

Full text not available from this repository.

Official URL: http://www.nonlin-processes-geophys.net/12/1033/20...

## Abstract

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.

Item Type: | Article |
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Subjects: | Mathematical and Computer Sciences > Mathematics > Applied Mathematics |

Divisions: | Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group |

ID Code: | 693 |

Deposited By: | Ulrike Eickers |

Deposited On: | 07 Aug 2009 08:54 |

Last Modified: | 22 Sep 2011 13:50 |

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