Influence of Vertical Shear of Basic Tangential Wind on the Development and Maintenance of Typhoon

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  • By using a linear symmetric Conditional Instability of Second Kind (CISK) model containing basic flow, we study the interactions between basic flow and mesoscale disturbances in typhoon. The result shows that in the early stage of typhoon formation, the combined action of vertical shear of basic flow at low level and CISK impels the disturbances to grow rapidly and to move toward the center of typhoon. The development of disturbances, likewise, influences on typhoon's development and structure. Analysis of the mesoscale disturbances' development and propagation indicates that the maximum wind region moves toward the center, wind velocity increases, and circulation features of an eye appear. Similarly, when a typhoon decays, the increase of low-level vertical wind shear facilitates the development of mesoscale disturbances. In turn, these mesoscale disturbances will provide typhoon with energy and make the typhoon intensify again. Therefore, it can be said that typhoon has the renewable or self-repair function.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Influence of Vertical Shear of Basic Tangential Wind on the Development and Maintenance of Typhoon

  • 1. Department of Geography,Hunan University of Science and Technology,Xiangtan 411201;
    Department of Geography,Hunan University of Science and Technology,Xiangtan 411201;
    Department of Geography,Hunan University of Science and Technology,Xiangtan 411201;
    Department of Geography,Hunan University of Science and Technology,Xiangtan 411201
Funds: Supported by the National Natural Science Foundation of China (41075046).

Abstract: By using a linear symmetric Conditional Instability of Second Kind (CISK) model containing basic flow, we study the interactions between basic flow and mesoscale disturbances in typhoon. The result shows that in the early stage of typhoon formation, the combined action of vertical shear of basic flow at low level and CISK impels the disturbances to grow rapidly and to move toward the center of typhoon. The development of disturbances, likewise, influences on typhoon's development and structure. Analysis of the mesoscale disturbances' development and propagation indicates that the maximum wind region moves toward the center, wind velocity increases, and circulation features of an eye appear. Similarly, when a typhoon decays, the increase of low-level vertical wind shear facilitates the development of mesoscale disturbances. In turn, these mesoscale disturbances will provide typhoon with energy and make the typhoon intensify again. Therefore, it can be said that typhoon has the renewable or self-repair function.

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