非绝热加热对热带气旋径向非均匀结构的影响
The influence of diabatic heating on tropical cyclone radial inhomogeneity structure
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摘要: 利用平面极坐标系下无摩擦有外源(非绝热加热)的正压无辐散方程,将热带气旋的物理量分解成环境场和扰动,进而求出了热带气旋扰动的行波解,并分析了风场(切向、径向)和重力位势扰动场的径向非均匀松紧结构.表明:这种松紧结构与热带气旋所在纬度的科氏参数(f)、热带气旋的强度(Ω)、热带气旋扰动的圆频率(ω)、热带气旋扰动在θ方向的角波数(m)有关,且不同要素的松紧结构不尽相同;同时还受非绝热加热(Q1)的影响,这种影响主要表现在使风场(切向、径向)呈内紧外松的非均匀分布.Abstract: Decomposing the Tropical cyclone asymmetric disturbance into the superposition of the symmetric environmental circulation, the travelling wave analytical solution is given by using the barotropical non-divergent model with diabatic heating forcing and non-friction in a plane polar coordinate.It is found that the radial inhomogeneity structure is influenced by the Coriolis parameter(f), tropical cyclone intensity(Ω),circular frequency(ω) and angular wave number(m) of tropical cyclone disturbance, and the diabatic heating(Q1) has significant impacts on the radial inhomogeneity structure of tropical cyclone wind(radial and tangential velocity).
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Key words:
- Tropical cyclone /
- diabatic heating /
- radial inhomogeneity structure
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