Synergistic Effects of Midlevel Dry Air and Vertical Wind Shear on Tropical Cyclone Development via Ventilation
Synergistic Effects of Midlevel Dry Air and Vertical Wind Shear on Tropical Cyclone Development via Ventilation
复制标题
中空干燥空气与垂直风切变对热带气旋通风发展的协同作用
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Joshua J. Alland
中科院分区：
文献类型：
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作者：
Joshua J. Alland
为了更好地了解中层水汽和垂直风切变（VWS）如何通过通风协同调节热带气旋（TC）的发展，利用三维模拟框架进行了一系列实验。每个实验都有不同的初始中层湿度和VWS环境的组合。内核低层垂直质量通量与TC强度之间存在较强的线性正相关关系。垂直质量通量随强度的线性增加不是由于上升运动强度的增加，而是由于强上升运动面积的增加（w>0.5 m s-1）。这种关系表明，影响垂直质量通量的物理过程，如下沉气流和径向通风，直接影响TC的强度。
To better understand how midlevel moisture and vertical wind shear (VWS) synergistically modulate tropical cyclone (TC) development via ventilation, a threedimensional modeling framework is utilized to conduct a suite of experiments. Each experiment has a different combination of initial midlevel moisture and VWS environments. A strong, positive, linear relationship exists between the low-level vertical mass flux in the inner core and TC intensity. The linear increase in vertical mass flux with intensity is not due to an increased strength of upward motions, but instead, is due to an increased area of strong upward motions (w>0.5 m s-1). This relationship suggests that physical processes influencing the vertical mass flux, such as downdraft and radial ventilation, directly influence the intensity of a TC.