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Which feature does persistent subsidence create at the top of the boundary layer?

  • A.A subsidence inversion
  • B.A layer of neutral stability in which a displaced parcel experiences no restoring force whatsoever
  • C.A frontal surface
  • D.A level of free convection above which a saturated parcel continues to rise without further forcing

Answer: A

Sinking air warms as it descends and meets the cooler mixed layer beneath, creating a sharp temperature inversion that caps the boundary layer and traps moisture and pollutants below it. The trade wind inversion over the subtropical oceans is the classic large-scale example. Fronts and levels of free convection arise from quite different processes.

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