Structure and Aanalysis of the Eye of a Numerically Simulated Tropical Cyclone

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Abstract
A tropical cyclone has been simulated in a quadruply nested mesh model with finest grid resolution of about 5km. At the center of the vortex, a compact eye was maintained.Azimuthal means as well as asymmetry of the eye and the eye wall structure are described. The asymmetric features within the eye wall moved cyclonically at a much smaller rotation rate than the cyclonic wind within the eye wall. Roles of the mean radial-vertical circulation, the eddy motions and the diffusion effect in the maintenance of the mean structure are analyzed. In the analysis, attention is given to the balance between the wind and pressure fields and also to the budgets of relative angular momentum, heat and water vapor. The eddy motions caused a cooling and moistening effect in the eye which counterbalanced a warming and drying effect due to the mean sinking motion.