Sensitivity of the Simulated Tropical Cyclone Inner-Core Size to the Initial Vortex Size*
Sensitivity of the Simulated Tropical Cyclone Inner-Core Size to the Initial Vortex Size*
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DOI：
10.1175/2010mwr3335.1
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发表时间：
2010-11
影响因子：
3.2
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
摘要利用多重嵌套、完全可压缩、非静力热带气旋模式第四版（TCM4），研究了模拟热带气旋（TC）内核大小对初始涡旋大小的敏感性。结果表明，虽然在一般情况下，模拟的成熟阶段TC强度对初始涡旋大小的依赖性较弱，但模拟的TC内核大小在很大程度上取决于初始涡旋大小。初始涡的大小是至关重要的能量输入从海洋和向内角动量输送的有效性的横向环流驱动的眼壁对流和非绝热加热的螺旋雨带。在一个初始尺度较大的风暴中，强烈的外部风会导致眼壁外较大的熵通量，有利于活跃的螺旋雨带的发展。螺旋雨带释放的潜热对增加低层径向入流和加速切向对流起着关键作用。
Abstract The multiply nested, fully compressible, nonhydrostatic tropical cyclone model version 4 (TCM4) is used to examine and understand the sensitivity of the simulated tropical cyclone (TC) inner-core size to its initial vortex size. The results show that although the simulated TC intensity at the mature stage is weakly dependent on the initial vortex size for the general settings, the simulated TC inner-core size is largely determined by the initial vortex size. The initial vortex size is critical to both the energy input from the ocean and the effectiveness of the inward angular momentum transport by the transverse circulation driven by eyewall convection and diabatic heating in spiral rainbands. Strong outer winds in a storm with a large initial size lead to large entropy fluxes to a large radial extent outside the eyewall, favoring the development of active spiral rainbands. Latent heat released in spiral rainbands plays a key role in increasing the low-level radial inflow and accelerating tangent...