APPLICATION OF FAST FOURIER TRANSFORM (FFT) ON INVESTIGATING STRUCTURE AND DEVELOPMENT OF A TROPICAL CYCLONE VORTEX IN A DYNAMICAL VORTEX INITIALIZATION SCHEME

Abstract

This research investigated the structure and development of tropical cyclone vortex in a dynamical vortex initialization scheme using Fast Fourier Transform (FFT) technique. The results of wave analysis of the meteorological fields in storms such as winds at 10 m level, sea level pressure showed that the wave number 0 and 1 are the two major components contributing to the developments of meteorological fields in the storm inner core region. In addition, the study also found that the symmetric wave component plays the most important role on the vortex development. All other waves with wave number greater than 0 only significantly develops in the first 30 - 40 cycles. This allows us to use the vortex at the 40^thcycle as initial condition to save computing resources and time for possible application of the dynamical vortex initialization scheme in operational real time forecast.