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Which process most often breaks a capping inversion?

  • A.Continued surface heating combined with large scale ascent
  • B.Radiative cooling of the layer, which reduces the temperature at the top of the inversion during the evening
  • C.Subsidence
  • D.The advection of drier air, which lowers the lifting condensation level of the parcels beneath the cap

Answer: A

Heating warms the mixed layer from below while synoptic scale ascent cools and lifts the inversion from above, and the two together erode it. Convergence along a boundary can also provide the localised lift required. Subsidence strengthens the cap, and lowering the condensation level makes the parcel path warmer rather than helping it penetrate the cap. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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