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Which quantity does the tape recorder signal measure directly?

  • A.The strength of the polar vortex
  • B.The frequency at which planetary waves are breaking in the surf zone of the winter stratosphere above
  • C.The tropical ascent rate in the lower stratosphere
  • D.The rate at which methane is being oxidised into water vapour within the middle stratosphere above it

Answer: C

By following the upward progress of a given annual maximum or minimum through successive years of observation, the mean vertical velocity of the tropical branch of the Brewer-Dobson circulation can be read off directly. Values around 0.3 millimetres per second are found. It is one of the few direct measurements of a large scale vertical velocity anywhere in the atmosphere.

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