Balanced Contribution to the Intensification of a Tropical Cyclone Simulated in TCM4: Outer-Core Spinup Process*
Balanced Contribution to the Intensification of a Tropical Cyclone Simulated in TCM4: Outer-Core Spinup Process*
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DOI：
10.1175/2010jas3523.1
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发表时间：
2011-03
影响因子：
3.1
通讯作者：
H. Fudeyasu;Yuqing Wang
中科院分区：
文献类型：
--
作者：
H. Fudeyasu;Yuqing Wang
摘要通过求解Sawyer-Eliassen方程和计算方位平均切向风趋势方程中的项，研究了三维非静力全物理热带气旋模式第四版（TCM 4）对热带气旋加强的平衡贡献，特别是外核环流的旋转上升。结果表明，平衡动力学较好地捕捉到了模拟热带气旋的方位平均次级环流（径向和垂直环流）和对流层中层外核环流的旋转上升。对流层中层入流的发展是对活跃螺旋雨带眼壁外对流层中层-上层层状云（砧状云）非绝热加热的响应，并向内输送绝对角动量以旋转外核环流。虽然眼壁的方位平均非绝热加热率最大，但它对径向风的贡献以及由此引起的外核环流的自旋上升都是重要的。
Abstract The balanced contribution to the intensification of a tropical cyclone simulated in the three-dimensional, nonhydrostatic, full-physics tropical cyclone model version 4 (TCM4), in particular the spinup of the outer-core circulation, is investigated by solving the Sawyer–Eliassen equation and by computing terms in the azimuthal-mean tangential wind tendency equation. Results demonstrate that the azimuthal-mean secondary circulation (radial and vertical circulation) and the spinup of the midtropospheric outer-core circulation in the simulated tropical cyclone are well captured by balance dynamics. The midtropospheric inflow develops in response to diabatic heating in mid–upper-tropospheric stratiform (anvil) clouds outside the eyewall in active spiral rainbands and transports absolute angular momentum inward to spin up the outer-core circulation. Although the azimuthal-mean diabatic heating rate in the eyewall is the largest, its contribution to radial winds and thus the spinup of outer-core circul...