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Which effect does a subsidence inversion have on the boundary layer?

  • A.It caps its growth and traps moisture beneath
  • B.It allows the layer to deepen without limit because the descending air supplies additional heat from above
  • C.It has no effect
  • D.It cools the layer beneath, since the descending air originates at greater height where it is much colder

Answer: A

The inversion acts as a lid, preventing thermals from penetrating and confining moisture and pollutants to the layer below. This is why stratocumulus forms so readily beneath it and why haze accumulates. Descending air warms rather than cools by adiabatic compression, which is precisely what makes the inversion.

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