The effects of tropical winds on the extratropical circulation are examined using calculations of eddy transport with tropical flow that is representative of the easterly and westerly phases of the quasi-biennial oscillation (QBO). A dependence of extratropical circulation on tropical winds and the QBO is shown to originate in planetary wave transport. Also, the effects of low latitude flow on high latitude circulation and the behavior of the vortex in opposite phases of the QBO are examined.
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Murry L. Salby (1990) studied this question.