摘要: This note derives an analytical approximation for steady-state hurricane intensity in the three-layer model of Ooyama (1969). As more realistic but involved theory Emanuel (1986), square maximum wind speed is roughly proportional to ratio entropy momentum exchange coefficients, times a measure ambient thermal disequilibrium between sea surface and upper troposphere. The compares favourably set numerical simulations that covers broad range parameter space. Limitations analysis are briefly addressed, supergradient correction estimated. Copyright © 2010 Royal Meteorological Society