spiral toward the pole; see Fig. 9.6a of Danielsen and Louis (18). When such a flow occurs for a prolonged period of time, the corridor effect is likely to take the form shown by curve c in Fig. 8. However, because of the westerly flow, wave energy from the lower atmosphere can penetrate into the upper atmosphere and cause the circulation pattern to change from wave number 0 to that characterized by wave number 1. A high-pressure center often forms near mainland Alaska or the Aleutian Islands while a low-pressure center is above Asia. Winds associated with this pattern blow at 100 to 150 m/s over the pole; see Fig. 9.6b of Danielsen and Louis (18). The persistence of such a circulation pattern will cause the injected material to be spread over the entire Northern Hemisphere and will erase the corridor effect. A summary of weekly analyses of the circulation patterns for 1967 is given in (19). To determine accurately the magnitude of the possible corridor effects, atmospheric tidal motions and the dissipation of vertically-propagating gravity waves should also be considered. Because the purpose of this paper is restricted to the use of a simple conceptual model to identify the parameters that control the twodimensional-model predictions of the corridor effect, the actual transport and mixing
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