Nonlinear Response of a Tropical Cyclone Vortex to Prescribed Eyewall Heating with and without Surface Friction in TCM4: Implications for Tropical Cyclone Intensification
Nonlinear Response of a Tropical Cyclone Vortex to Prescribed Eyewall Heating with and without Surface Friction in TCM4: Implications for Tropical Cyclone Intensification
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DOI：
10.1175/jas-d-15-0164.1
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发表时间：
2016-02
影响因子：
3.1
通讯作者：
J. Heng;Yuqing Wang
中科院分区：
文献类型：
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作者：
J. Heng;Yuqing Wang
最近关于表面摩擦对热带气旋（TC）加强的作用是积极的还是消极的争论，已经根据两个理想化的数值试验得到澄清，一个没有，另一个有表面摩擦，使用完全可压缩的，非静力TC模式，版本4（TCM 4），规定的眼壁加热。结果表明，考虑地面摩擦后，TC涡旋的增强速率大大降低，表明地面摩擦对TC涡旋的增强有负贡献。切向风收支的结果表明，尽管地面摩擦大大增强了边界层入流和最大风速半径（RMW）的收缩，但由于摩擦引起的边界层绝对角动量（AAM）向内输送所产生的正切向风趋势不足以抵消由于AAM直接摩擦损失到地面而产生的负趋势。Sawyer-Eliassen方程的结果
AbstractThe recent debate on whether surface friction contributes positively or negatively to tropical cyclone (TC) intensification has been clarified based on two idealized numerical experiments, one without and the other with surface friction, using the fully compressible, nonhydrostatic TC model, version 4 (TCM4), with prescribed eyewall heating. The results show that with surface friction included, the intensification rate of the TC vortex is largely reduced, indicating that surface friction contributes negatively to TC intensification. Results from tangential wind budgets demonstrate that although surface friction largely enhances the boundary layer inflow and the contraction of the radius of maximum wind (RMW), the positive tangential wind tendency resulting from the frictionally induced inward absolute angular momentum (AAM) transport in the boundary layer is not large enough to offset the negative tendency due to the direct frictional loss of AAM to the surface. Results from the Sawyer–Eliassen eq...