The Transport of Conservative Trace Gases by Planetary Waves.

Physics

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Scientific paper

An analytical model for the horizontal and vertical transport of a conservative trace gas by a stationary planetary wave is developed. The wave is associated with a constant background zonal flow. In the absence of dissipation, transports are zero if the wave is trapped, i.e., the background flow is easterly or strong westerly. Propagating waves can carry out appreciable transports. The vertical transport is proportional to the latitudinal gradient of the background mixing ratio and the horizontal transport is proportional to the vertical gradient.With dissipation in the form of Newtonian cooling, transports are permitted by trapped waves. For strong westerlies, they are very small but for easterlies they can be appreciable. In fact, substantial southward ozone transports in the summertime lower stratosphere are suggested.The simplicity of the flux expressions suggests that they might be exploited in two-dimensional models of ozone.

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