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Which process concentrates vorticity into a tropical cyclone core?

  • A.The tilting of horizontal vorticity by the updraughts within the individual convective towers present
  • B.Radiative cooling
  • C.The advection of planetary vorticity from higher latitudes towards the location of the developing storm
  • D.Sustained convergence in the boundary layer

Answer: D

Frictional and dynamical convergence draws air inward through a great depth of the boundary layer, and the stretching term concentrates the absolute vorticity of that inflowing air into the core. Tilting contributes at the scale of individual towers but the organised intensification is a stretching process. Radiative cooling and planetary vorticity advection play no direct part in the concentration. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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