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Which structural feature is required for that conversion?

  • A.An eastward tilt
  • B.A structure whose amplitude is greatest at the level of the jet core rather than near the boundaries
  • C.A westward tilt of the disturbance with height
  • D.A vertically upright structure so that the circulations at the two levels reinforce one another fully

Answer: C

The tilt places rising motion in the warm air and sinking motion in the cold air, which lowers the centre of gravity of the atmosphere and releases the available potential energy. An eastward tilt reverses the conversion and describes a decaying system, while a vertically upright structure gives no net conversion at all. This is why occlusion, which brings the structure upright, ends the deepening. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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