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In a recent paper Rousseau-Rizzi and Emanuel (2019) presented a derivation ofan upper limit on maximum hurricane velocity at the surface. This derivationwas based on a consideration of an infinitely narrow (differential) Carnotcycle with the warmer isotherm at the point of the maximum wind velocity. Herewe show that this derivation neglected a significant term describing thekinetic energy change in the outflow. Additionally, we highlight the importanceof a proper accounting for the power needed to lift liquid water. Finally, weprovide a revision to the formula for surface fluxes of heat and momentumshowing that, if we accept the assumptions adopted by Rousseau-Rizzi andEmanuel (2019), the resulting velocity estimate does not depend on the flux ofsensible heat.

Comments on "An evaluation of hurricane superintensity in axisymmetric numerical models" by Rapha\"el Rousseau-Rizzi and Kerry Emanuel