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Which stability structure does the land breeze possess?

  • A.A deep unstable layer, since the offshore flow is heated from below as it passes over the warmer water
  • B.Neutral stratification
  • C.An inversion aloft with a well mixed layer beneath, in the manner of a daytime convective boundary layer
  • D.A shallow stable layer flowing beneath warmer air

Answer: D

The offshore flow is itself a shallow cold layer, but as it crosses the warmer water it is heated from below and destabilises, which is why convection can develop offshore at night. Both descriptions are therefore partly right depending on how far offshore one looks. The initial structure close to the coast is the stable one, which is what the question asks about. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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