Several previous studies have demonstrated the significant sensitivity of simulated tropical cyclone structure and intensity to variations in surface-exchange coefficients for enthalpy (C-k) and momentum (C-d), respectively. In this study we investigate the consistency of the estimated peak intensity, intensification rate, and steady-state structure between an analytical model and idealized axisymmetric numerical simulations for both constant C-k and C-d values and various wind speeddependent representations of C-k and C-d. The present analysis with constant C-k and C-d values demonstrates that the maximum wind speed is similar for identical C-k/C-d values less than 1, regardless of whether changes were made to C-k or C-d. However, for a given C-k/C-d greater than 1, the simulated and theoretical maximum wind speed are both greater if C-d is decreased compared to C-k increased. This behavior results because of a smaller enthalpy disequilibrium at the radius of maximum winds for larger C-k. Additionally, the intensification rate is shown to increase with C-k and C-d and the steady-state normalized wind speed beyond the radius of maximum winds is shown to increase with increasing C-d. Experiments with wind speed-dependent C-k and C-d were found to be generally consistent, in terms of the intensification rate and the simulated and analytical-model-estimated maximum wind speed, with the experiments with constant C-k and C-d.
