热带气旋发展增强过程中龙卷尺度涡旋活动特征

周玥滢, 方娟

Characteristics of tornado⁃scale vortices in an intensifying tropical cyclone

Yueying Zhou, Juan Fang

图10 30日00时至31日10时200 m高度上轴对称叠加1波的Fjortoft判据 The black circle indicates the radius of the maximum wind speed at 200 m height，and the red circle indicates the radius of the axisymmetric vertical relative vorticity maxima at 200 m height.

Fig.10 Fjortoft criterion for the axisymmetric superposition of a wave at 200 m height from 00:00 on the 30th to 10:00 on the 31st