A thermodynamic pathway leading to rapid intensification of tropical cyclones in shear
A thermodynamic pathway leading to rapid intensification of tropical cyclones in shear
复制标题
导致热带气旋剪切力快速增强的热力学途径
DOI：
10.1029/2019gl083667
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Frank D. Marks
中科院分区：
文献类型：
--
作者：
陈小敏;Jun A. Zhang;Frank D. Marks
了解环境垂直风切变下导致热带气旋（TC）快速增强（RI）的物理过程是改进TC强度预报的关键。本研究分析的热力学过程，有助于饱和TC内核RI发病前使用列集成湿静力能量（MSE）的框架。结果表明，对流层中低层的近饱和内核是通过柱积分MSE的增加来实现的，因为柱水汽积累，而平均柱温度冷却。柱积分MSE趋势的符号取决于表面焓通量、辐射和垂直风切变引起的通风效应之间的竞争。由于垂直排列，边界层上方的通风减少，这对于在内核区域内积累能量至关重要。RI模拟与零模拟的比较进一步突出了涡旋结构对热力状态调整和TC加强的影响。
Understanding physical processes leading to rapid intensification (RI) of tropical cyclones (TCs) under environmental vertical wind shear is key to improving TC intensity forecasts. This study analyzes the thermodynamic processes that help saturate the TC inner core before RI onset using a column‐integrated moist static energy (MSE) framework. Results indicate that the nearly saturated inner core in the lower‐middle troposphere is achieved by an increase in the column‐integrated MSE, as column water vapor accumulates while the mean column temperature cools. The sign of the column‐integrated MSE tendency depends on the competition between surface enthalpy fluxes, radiation, and vertical wind shear‐induced ventilation effect. The reduction of ventilation above the boundary layer due to vertical alignment is crucial to accumulate the energy within the inner core region. A comparison of the RI simulation with a null simulation further highlights the impact of vortex structure on the thermodynamic state adjustment and TC intensification.