An Observational Study of the Symmetric Boundary Layer Structure and Tropical Cyclone Intensity
An Observational Study of the Symmetric Boundary Layer Structure and Tropical Cyclone Intensity
复制标题
DOI：
10.3390/atmos11020158
复制
发表时间：
2020-02
期刊：
影响因子：
2.9
通讯作者：
Yifang Ren;Jun A. Zhang;J. Vigh;P. Zhu;Hailong Liu;Xiang Wang;Joshua B. Wadler
中科院分区：
文献类型：
--
作者：
Yifang Ren;Jun A. Zhang;J. Vigh;P. Zhu;Hailong Liu;Xiang Wang;Joshua B. Wadler
本研究分析全球定位系统下投式探空仪记录的轴对称热带气旋（TC）边界层结构，风暴强度的基础上。在综合分析中使用了1998年至2017年大西洋盆地42个命名TC的2608个下投式探空仪。结果表明，TC越强，轴对称入流层深度、最大切向风速高度和热力混合层深度都越浅。结果还表明，更强烈的TC往往有一个接近饱和的空气最大风速（RMW）半径内的深层。RMW附近的等效位温径向梯度（θe）的大小与风暴强度呈正相关。在入流层上方，不同强度TC的复合结构都具有一个围绕暖核的异常冷温度环，暖核异常的大小与TC强度成正比。这里提出的边界层复合材料提供了一个如何轴对称TC边界层结构随强度变化的气候学。
This study analyses Global Positioning System dropsondes to document the axisymmetric tropical cyclone (TC) boundary-layer structure, based on storm intensity. A total of 2608 dropsondes from 42 named TCs in the Atlantic basin from 1998 to 2017 are used in the composite analyses. The results show that the axisymmetric inflow layer depth, the height of maximum tangential wind speed, and the thermodynamic mixed layer depth are all shallower in more intense TCs. The results also show that more intense TCs tend to have a deep layer of the near-saturated air inside the radius of maximum wind speed (RMW). The magnitude of the radial gradient of equivalent potential temperature (θe) near the RMW correlates positively with storm intensity. Above the inflow layer, composite structures of TCs with different intensities all possess a ring of anomalously cool temperatures surrounding the warm-core, with the magnitude of the warm-core anomaly proportional to TC intensity. The boundary layer composites presented here provide a climatology of how axisymmetric TC boundary layer structure changes with intensity.