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A study of numerical modeling of tropical cyclones and formation

热带气旋及其形成的数值模拟研究

基本信息

批准号：
06640555
负责人：
YAMASAKI Masanori
金额：
$ 1.28万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

In this study, based on two types of models such as a non-hydrostatic axi-symmetric model which can resolve cumulus-scale motion and a three-dimensional hydrostatic model with cumulus-scale parameterization which the author developed. many numerical experiments have been performed in order to understand the mechanism of tropical cyclone formation and mesoscale structure. As for model improvement. vertical distribution of heat released by parameterized convection in the hydrostatic model was improved to get better simulation of mesoscale structure of tropical cyclones.Numerical experiments were performed to understand the formation process of tropical cyclones in intertropical convergence zone. Meso-scale organization of cumulus convection is found to be essential to formation of a vortex and its intensification. In this experiment mesoscale structure such as strong winds located at the southeastern portion of the vortex and cyclonic rotation of mesoscale organized convection were simulated well. The mesoscale structure of wind and temperature fields were analyzed in some detail. Numerical experiments were also performed to simulate and understand the process where Rossby mode is separated from Kelvin mode in the equatorial area. A vortex developed from a Rossby mode and it transformed into a tropical cyclone.

本研究基于作者开发的可解析积云尺度运动的非静水力轴对称模型和具有积云尺度参数化的三维静水力模型两类模型。为了了解热带气旋的形成机制和中尺度结构，已经进行了许多数值实验。至于模型的改进。改进了静水模型中参数化对流释放热量的垂直分布，以更好地模拟热带气旋的中尺度结构。通过数值实验了解热带气旋在热带辐合带的形成过程。人们发现积云对流的中尺度组织对于涡旋的形成及其增强至关重要。本次实验很好地模拟了涡旋东南部的强风、中尺度有组织对流的气旋式旋转等中尺度结构。对风场和温度场的中尺度结构进行了较为详细的分析。还进行了数值实验来模拟和理解赤道地区罗斯贝模态与开尔文模态分离的过程。罗斯贝模式产生的涡旋转变为热带气旋。