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Which reversal occurs in the sea breeze circulation at night?

  • A.A strengthening of the sea breeze as the land continues to radiate heat into the atmosphere above it
  • B.No change
  • C.A circulation aligned along the coast rather than across it, driven by the Coriolis deflection of the flow
  • D.A land breeze with offshore flow at the surface

Answer: D

At night the land cools faster than the sea, reversing the temperature contrast and hence the solenoidal term, so a weaker land breeze blows offshore. It is weaker because the nocturnal temperature contrast is smaller and the stable boundary layer is shallower. The Coriolis force does turn the sea breeze over the course of a long afternoon, which is why the final option is plausible, but that turning modifies rather than replaces the direct circulation.

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