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The environmental lapse rate in the troposphere averages about

  • A.20.0 degrees per kilometre
  • B.6.5 degrees per kilometre
  • C.10.0 degrees per kilometre
  • D.1.0 degrees per kilometre

Answer: B

Correct answer: 6.5 degrees per kilometre

The environmental lapse rate averages about 6.5 degrees per kilometre through the troposphere. It is worth distinguishing from the two adiabatic rates: the dry adiabatic rate is very nearly 10 degrees per kilometre and the saturated rate around 5, and the environmental value sits between them because the real atmosphere is a mixture of conditions rather than a parcel being lifted.

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