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Which quantity does Emanuel's maximum potential intensity depend on?

  • A.The vertical wind shear through the depth of the troposphere within the environment surrounding the storm
  • B.The ratio of enthalpy to drag coefficients and the thermodynamic disequilibrium
  • C.The Coriolis parameter at the latitude of the storm together with the radius of its circulation at the surface
  • D.The available potential energy

Answer: B

The theory treats the storm as a Carnot engine drawing enthalpy from the warm ocean and rejecting heat at the cold outflow temperature, with the intensity set by the exchange coefficients and the air sea disequilibrium. Shear and rotation determine whether a storm can organise but not its thermodynamic ceiling. The theory gives an upper bound that few storms actually attain. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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