Tropical Cyclone Outer Size Impacts the Number and Location of Tornadoes
Tropical Cyclone Outer Size Impacts the Number and Location of Tornadoes
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DOI：
10.1029/2021gl095922
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发表时间：
2021-11
影响因子：
5.2
通讯作者：
Marco Paredes;B. Schenkel;R. edwards;M. Coniglio
中科院分区：
文献类型：
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作者：
Marco Paredes;B. Schenkel;R. edwards;M. Coniglio
关于热带气旋（TC）风场的外部大小是否影响龙卷风的发生尚未达成共识。本研究利用数十年龙卷风报告、再分析得出的 TC 外部尺寸度量和无线电探空仪数据，统计研究了 TC 外部尺寸与龙卷风数量和位置之间的关系。这些结果表明，较大的 TC 产生的龙卷风距离气旋中心更远，区域范围更广，尽管这些变化并不完全与 TC 的外部尺寸成比例。 TC 越大，每 6 小时龙卷风发生的频率越高，尤其是龙卷风数量的增加。较大 TC 中龙卷风发生的这些变化可能是由于下切变扇区龙卷风有利螺旋度的扩大，这可能被左切变象限 CAPE 的减少部分抵消。
There remains no consensus on whether the outer size of the tropical cyclone (TC) wind field impacts tornado occurrence. This study statistically examines the relationship between TC outer size with both the number and location of tornadoes using multidecadal tornado reports, a reanalysis‐derived TC outer size metric, and radiosonde data. These results show that larger TC spawn tornadoes that are located farther from and over a broader region relative to the cyclone center, although these changes do not entirely scale with TC outer size. Larger TCs are also associated with more frequent occurrence of tornadoes per 6 h, especially enhanced numbers of tornadoes. These changes in tornado occurrence in larger TCs may be due to a broadening of favorable helicity for tornadoes in the downshear sector, which may be partially offset by CAPE reductions in the left‐of‐shear quadrants.