The tropical cyclone motion is numerically simulated with a quasi-geostrophic baroclinic model. The flow field of a tropical cyclone is decomposed into its axisymmetric and asymmetric components. The relation between ...The tropical cyclone motion is numerically simulated with a quasi-geostrophic baroclinic model. The flow field of a tropical cyclone is decomposed into its axisymmetric and asymmetric components. The relation between the ventilation flow vector and the motion vector of the tropical cyclone is inves- tigated.The results of numerical experiments indicate:(1) There are both large-scale beta gyres and small-scale gyres in the asyrnmetric flow field.(2) The interaction between small-scale gyres and large-scale beta gyres leads to the oscillation of translation speed and translation direction for the tropi- cal cyclone.(3) There are the large deviations between the ventilation flow vector calculated by means of Fiorino and Elsberry's method and the motion vector of tropical cyclone.(4) The ventila- tion flow vector computed using the improved method closely correlates with the motion vector of the tropical cyclone.展开更多
基金This work is supported by the 8th Five-Year Project of Key Item Research of China under Grant 85-906-07-02-04.
文摘The tropical cyclone motion is numerically simulated with a quasi-geostrophic baroclinic model. The flow field of a tropical cyclone is decomposed into its axisymmetric and asymmetric components. The relation between the ventilation flow vector and the motion vector of the tropical cyclone is inves- tigated.The results of numerical experiments indicate:(1) There are both large-scale beta gyres and small-scale gyres in the asyrnmetric flow field.(2) The interaction between small-scale gyres and large-scale beta gyres leads to the oscillation of translation speed and translation direction for the tropi- cal cyclone.(3) There are the large deviations between the ventilation flow vector calculated by means of Fiorino and Elsberry's method and the motion vector of tropical cyclone.(4) The ventila- tion flow vector computed using the improved method closely correlates with the motion vector of the tropical cyclone.
