Meridional circulation An atmospheric circulation in a vertical plane oriented along a meridian. It consists, therefore, of the vertical and the meridional (North or South) components of motion only.
flow - A type of atmospheric circulation pattern in which the meridional (north and south) component of motion is unusually pronounced. The accompanying zonal component is usually weaker than normal. Compare zonal flow, meridional circulation; ...
Strong upwelling of air from below, associated with a pole-to-pole meridional circulation in the upper mesosphere, is responsible for both the extreme cold and the upward flux of water vapor.
 See also: Circulation, High, Radiation, Meridional, Gravity
  
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