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Which ascent rate does that signal reveal?

  • A.About 1 micrometre per second, which would be too slow to produce any detectable signal within a decade
  • B.About 0.3 millimetres per second
  • C.About 1 centimetre per second, which is the typical synoptic scale vertical velocity in the mid-latitudes
  • D.About 1 metre per second

Answer: B

The tape recorder signal ascends about ten kilometres in a year, which corresponds to roughly 0.3 millimetres per second. That is far slower than tropospheric synoptic vertical motion, reflecting the strong stratification and the weakness of the wave driving. The measurement is a valuable constraint on models of the Brewer-Dobson circulation.

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