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11 形成于30日17:48前后（a） 100 m和（c） 200 m高度上；31日06:01前后（b） 100 m和（d） 200 m高度上的一个TSV的涡度变化以及涡度收支各项随时间的变化 The red solid line is the regionally averaged vorticity magnitude (unit: s-1)，the black solid line is the vorticity tendency (unit: s-2)， the red dashed line is the horizontal advection term (unit: s-2)，the blue dashed line is the vertical transport term (unit: s-2)， the purple dashed line is the torsion term (unit: s-2)，and the green dashed line is the stretching term (unit: s-2).

Fig.11 Vorticity variations of a TSV formed at (a) 100 m and (c) 200 m heights around 17:48 on the 30th; and (b) 100 m and (d) 200 m heights around 06:01 on the 31st，as well as variations of each item of the vorticity income and expenditure over time