Chaotic mixing and transport in Rossby-wave critical layers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Pages (from-to)315-351
Journal / PublicationJournal of Fluid Mechanics
Volume334
Publication statusPublished - 10 Mar 1997
Externally publishedYes

Abstract

A simple, dynamically consistent model of mixing and transport in Rossby-wave critical layers is obtained from the well-known Stewartson-Warn-Warn (SWW) solution of Rossby-wave critical-layer theory. The SWW solution is thought to be a useful conceptual model of Rossby-wave breaking in the stratosphere. Chaotic advection in the model is a consequence of the interaction between a stationary and a transient Rossby wave. Mixing and transport are characterized separately with a number of quantitative diagnostics (e.g. mean-square dispersion, lobe dynamics, and spectral moments), and with particular emphasis on the dynamics of the tracer field itself. The parameter dependences of the diagnostics are examined: transport tends to increase monotonically with increasing perturbation amplitude whereas mixing does not. The robustness of the results is investigated by stochastically perturbing the transient-wave phase speed. The two-wave chaotic advection model is contrasted with a stochastic single-wave model. It is shown that the effects of chaotic advection cannot be captured by stochasticity alone.

Citation Format(s)

Chaotic mixing and transport in Rossby-wave critical layers. / Ngan, Keith; Shepherd, Theodore G.

In: Journal of Fluid Mechanics, Vol. 334, 10.03.1997, p. 315-351.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal