对Raphaël Rousseau-Rizzi和Kerry Emanuel的“轴对称数值模型中飓风超强度的评估”一文的评论
Comments on "An evaluation of hurricane superintensity in axisymmetric numerical models" by Raphaël Rousseau-Rizzi and Kerry Emanuel
AI总结:
本文指出Rousseau-Rizzi和Emanuel(2019)推导最大飓风速度上限时忽略了流出流动能变化项,强调计算提升液态水功率的重要性,并修订地表通量公式,证明所得速度估计不依赖于sensible heat通量。
摘要:
在近期的一篇论文中,Rousseau-Rizzi和Emanuel(2019)提出了地表最大飓风速度上限的推导。该推导基于对无限窄(微分)Carnot循环的考量,其较暖等温线位于最大风速点。在此我们表明,该推导忽略了描述流出流中动能变化的一项重要项。此外,我们强调了正确计算提升液态水所需功率的重要性。最后,我们修订了热量和动量的地表通量公式,表明如果我们接受Rousseau-Rizzi和Emanuel(2019)采用的假设,所得速度估计不依赖于 sensible heat 通量。
英文摘要:
In a recent paper Rousseau-Rizzi and Emanuel (2019) presented a derivation of an upper limit on maximum hurricane velocity at the surface. This derivation was based on a consideration of an infinitely narrow (differential) Carnot cycle with the warmer isotherm at the point of the maximum wind velocity. Here we show that this derivation neglected a significant term describing the kinetic energy change in the outflow. Additionally, we highlight the importance of a proper accounting for the power needed to lift liquid water. Finally, we provide a revision to the formula for surface fluxes of heat and momentum showing that, if we accept the assumptions adopted by Rousseau-Rizzi and Emanuel (2019), the resulting velocity estimate does not depend on the flux of sensible heat.
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