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Fig. 7

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2D distribution of the mixing efficiency on the 1mbar isobar. We plot . Positive is either an upward flux of gas enhanced in tracers compared to the horizontal mean or a downward flux of gas depleted in tracer compared to the horizontal mean value. Negative is either a downward flux of gas enhanced in tracer or an upward flux of gas depleted in tracer. Thus a positive value enhances the (horizontally averaged) upward flux, whereas a negative value diminishes it. These fluxes are normalized to the mean upward flux of tracer and the global-mean on an isobar of the plotted quantity is 1.

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