摘要：Two of the most important tropical cyclone parameters, which are used as a measure of its intensity, are the maximum surface wind speed reached (local parameter) and the pressure difference between the free atmosphere and the pressure in the center of the storm(global parameter). In this paper we reexamined the relationship between these parameters via the Euler's number. The Euler's number is a nondimensional parameter which relates the pressure difference and the dynamic pressure generated by the maximum value of the wind speed. The calculations were performed all along the track of fifty tropical cyclones using the NHC's ``extended best track'' database for the Atlantic basin. It was found that when the cyclone is overwater the Euler's number tends to remain constant, while over land the parameter varies drastically with a tendency to grow, confirming that at sea, when it has reached hurricane strength, tropical cyclones evolve slowly staying near the steady state, highlighting the importance of transient states during strong dissipation. The Euler's number seems to be independent of the global warming.
