Sensitivity of Tropical Cyclone Inner-Core Size and Intensity to the Radial Distribution of Surface Entropy Flux
Sensitivity of Tropical Cyclone Inner-Core Size and Intensity to the Radial Distribution of Surface Entropy Flux
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DOI：
10.1175/2010jas3387.1
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发表时间：
2010-06
影响因子：
3.1
通讯作者：
Jing Xu;Yuqing Wang
中科院分区：
文献类型：
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作者：
Jing Xu;Yuqing Wang
地面能(熵)通量对热带气旋(TC)的发展和维持至关重要。然而，目前还不清楚热带气旋的内核大小和强度对气旋下表面熵通量的径向分布有多敏感。在这项研究中，使用多重嵌套的、完全可压缩的、非静力TC模式TCM4来检验这种潜在的敏感性。通过人工剔除不同径向范围内的表面熵通量，评价了不同径向范围内的表面熵通量对模拟热带气旋核芯大小和强度的影响。与轴对称模式的最新结果一致，TC眼区的熵通量对风暴强度的贡献不大，但它对减小最大风半径(RMW)有一定的作用。虽然眼壁下的表面熵通量对风暴强度有很大贡献，但眼壁外半径约为2-4 mm的表面熵通量对暴雨强度有较大贡献.
Abstract The surface energy (entropy) flux is critical to the development and maintenance of a tropical cyclone (TC). However, it is unclear how sensitive the inner-core size and intensity of a TC could be to the radial distribution of the surface entropy flux under the TC. Such a potential sensitivity is examined in this study using the multiply nested, fully compressible, nonhydrostatic TC model TCM4. By artificially eliminating the surface entropy fluxes in different radial extent in different experiments, the effect of the surface entropy flux in the different radial ranges on the inner-core size and intensity of a simulated TC is evaluated. Consistent with recent findings from axisymmetric models, the entropy flux in the eye region of a TC is found to contribute little to the storm intensity, but it plays a role in reducing the radius of maximum wind (RMW). Although surface entropy fluxes under the eyewall contribute greatly to the storm intensity, those outside the eyewall up to a radius of about 2–...