The Ocean’s Effect on the Intensity of Tropical Cyclones: Results from a Simple Coupled Atmosphere–Ocean Model

Abstract A coupled hurricane–ocean model was constructed from an axisymmetric hurricane model and a three-layer ocean model. If the hurricane moves at constant speed across the ocean a statistically steady state (in a reference frame moving with the storm) is reached after a few days of simulation time. The steady-state intensity of the hurricane is strongly affected by the interaction with the ocean. This interaction with the ocean can be described as a negative feedback effect on the hurricane’s intensity and is called “SST feedback.” A large set of numerical experiments was performed with the coupled model to deduce systematically the dependence of the amplitude of the SST feedback effect on a set of model parameters. In the coupled model the SST feedback effect can reduce the hurricane’s intensity by more than 50%. Only in cases of rapidly moving storms over deep oceanic mixed layers is the SST feedback effect of minor importance. These results cast a new light on the role of the ocean in limiting hur...

[1]  K. Emanuel,et al.  Interaction of a Baroclinic Vortex with Background Shear: Application to Hurricane Movement. , 1993 .

[2]  Simon Chang,et al.  The Mutual Response of the Tropical Cyclone and the Ocean as Revealed by AN Interacting Atmospheric and Oceanic Model. , 1977 .

[3]  Kerry A. Emanuel,et al.  The Maximum Intensity of Hurricanes. , 1988 .

[4]  D. Leipper.  Observed Ocean Conditions and Hurricane Hilda, 1964 , 1967 .

[5]  E. Buckingham.  On Physically Similar Systems; Illustrations of the Use of Dimensional Equations , 1914 .

[6]  K. Ooyama,et al.  Numerical Simulation of the Life Cycle of Tropical Cyclones , 1969 .

[7]  G. Holland.  The Maximum Potential Intensity of Tropical Cyclones , 1997 .

[8]  I. Ginis,et al.  The mutual response of a moving tropical cyclone and the ocean , 1991 .

[9]  J. Price,et al.  Upper Ocean Response to a Hurricane , 1981 .

[10]  K. Emanuel.  Sensitivity of Tropical Cyclones to Surface Exchange Coefficients and a Revised Steady-State Model incorporating Eye Dynamics , 1995 .

[11]  George Z. Forristall,et al.  Forced Stage Response to a Moving Hurricane , 1994 .

[12]  I. Ginis,et al.  Numerical simulations of tropical cyclone‐ocean interaction with a high‐resolution coupled model , 1993 .

[13]  K. Emanuel.  The Finite-Amplitude Nature of Tropical Cyclogenesis , 1989 .

[14]  K. Emanuel,et al.  Dissipative heating and hurricane intensity , 1998 .

[15]  E. Kleinschmidt.  Grundlagen einer Theorie der tropischen Zyklonen , 1951 .

[16]  J. Price.  Internal Wave Wake of a Moving Storm. Part I. Scales, Energy Budget and Observations , 1983 .

[17]  Katsuyuki V. Ooyama,et al.  Conceptual Evolution of the Theory and Modeling of the Tropical Cyclone , 1982 .

[18]  H. Riehl.  A Model of Hurricane Formation , 1950 .

[19]  J. Thompson,et al.  Hurricane‐generated currents on the outer continental shelf: 1. Model formulation and verification , 1989 .