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Which pattern of absolute vorticity accompanies a mature occluded cyclone?

  • A.A broad ridge of minimum vorticity extending outward from the centre along the occluded front itself
  • B.Uniform vorticity
  • C.A pair of separate maxima positioned on either side of the surface low at equal distances from it
  • D.A closed maximum wrapped around the surface centre

Answer: D

As a cyclone occludes, the vorticity maximum that was upstream of the surface low wraps around and becomes vertically aligned with it, giving a closed centre on the chart. That alignment marks the end of deepening. A pair of maxima can occur transiently during a merger, and a vorticity minimum would indicate anticyclonic flow, which is the opposite of what a cyclone possesses.

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