Tropical Cyclone Outflow-Layer Structure and Balanced Response to Eddy Forcings
Tropical Cyclone Outflow-Layer Structure and Balanced Response to Eddy Forcings
复制标题
热带气旋流出层结构和对涡流强迫的平衡响应
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
David Vollaro
中科院分区：
文献类型：
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作者：
Sarah D. Ditchek;J. Molinari;David Vollaro
摘要 ERA-Interim 用于生成 1979 年至 2014 年大西洋盆地热带气旋的方位平均合成。对于所有风暴强度，平均状态和涡流强迫项都表现出相似的径向-垂直结构，仅在强度上有所不同。因此，仅详细描述了主要飓风。径向流入和流出超出了2000公里半径。流出层的温暖异常达到2000公里。流出层内的复合涡动量通量比平均动量通量大2.5倍，凸显了流出物与环境相互作用的重要性。应用平衡涡流方程来了解涡流热和动量通量的作用。主要术语是横向涡流热通量收敛、横向涡流动量通量和涡流科里奥利扭矩。每一种都起到增强次级循环的作用。涡动动量通量项产生的响应大约是热通量项的两倍。涡流科里奥利扭矩产生的循环来自......
AbstractThe ERA-Interim is used to generate azimuthally averaged composites of Atlantic basin tropical cyclones from 1979 to 2014. Both the mean state and the eddy forcing terms exhibited similar radial–vertical structure for all storm intensities, varying only in magnitude. Thus, only major hurricanes are described in detail. Radial inflow and outflow extended beyond the 2000-km radius. Warm anomalies reached 2000 km in the outflow layer. Composite eddy momentum fluxes within the outflow layer were 2.5 times larger than mean momentum fluxes, highlighting the importance of outflow–environment interactions. A balanced vortex equation was applied to understand the role of eddy heat and momentum fluxes. Dominant terms were the lateral eddy heat flux convergence, lateral eddy momentum flux, and eddy Coriolis torque. Each acted to enhance the secondary circulation. The eddy momentum flux terms produced about twice the response of heat flux terms. The circulation created by the eddy Coriolis torque arises from ...