A Case of Cross-Equatorial Displacement of a Vortex
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Due to the vanishing Coriolis parameter in the equatorial region, it is possible for a vortex of given pressure distribution to rotate in either direction. On the other hand, a vortex originating on one side of the equator with a direction of rotation dictated by the sign of the Coriolis parameter, if displaced to the other side of the equator, may maintain its original direction of rotation for a period of time as long as it is not displaced too far away from the equator.
The article of record as published may be found at http://dx.doi.org/10.1175/1520-0493(1976)104<0653:ACOCDO>2.0.CO;2
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