Numerical Simulation of the Effect of Radiative Processes on the Development of Tropical Cyclones

Abstract

In order to investigate the effect of radiative processes on the development of tropical cyclone, a three-dimensional PE model has been constructed. Two numerical experiments were carried out. In the first numerical experiment, the rather realistic structure and evolution of tropical cyclone was simulated. The second numerical experiment is a variation from the first one with the radiation factors (including shortwave and longwave radiative processes, and the different patterns of cloudiness) incorporating in the model. The comparison made between these two experiments has shown that for the case with radiative processes, a more intensely developed tropilal cyclone was obtained with the considerable enhancement of the maximum wind speed and the upward motion in the eyewall region. In turn, the transverse circulation in the tropical cyclone was intensified, and the descending motion in the eye region also increased, especially the upper level. Therefore, the structure and evolution of tropical cyclone simulated for the case with the radiative processes is more realistic than the case without the radiative processes. Finally, a possible explanation of the effect of radiative processes on the development of tropical cyclone has been suggested.