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Which circulation results from the combined entrance and exit patterns?

  • A.Two direct circulations, one at each end of the jet streak, with ascent on the same side of both
  • B.A single circulation spanning the whole jet
  • C.No circulation at all, because the ageostrophic components at the two ends cancel one another exactly
  • D.A direct circulation at the entrance and an indirect one at the exit

Answer: D

The entrance circulation has warm air rising and cold air sinking, which is thermally direct and releases energy, while the exit circulation has the opposite sense and consumes it. This pairing is a robust feature of jet streaks and explains why cloud shields often appear beneath the right entrance and left exit quadrants simultaneously. The two circulations do not cancel because they occupy different parts of the jet. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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