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Which structural feature allows the conversion of that energy?

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

Answer: C

The tilt places rising motion in the warm air and sinking motion in the cold air, which lowers the centre of gravity and converts available potential energy into eddy kinetic 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, marks the end of deepening. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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