Abstract

We present the results of applying the Lagrangian methods to study the fine dynamic structure of the stratospheric polar vortex in the winter–spring of 2019–2020. Characteristics of the vortex structure for this winter are compared with those of a strong polar vortex and the winter of 2018–2019, when the vortex was weak. Due to the low activity of planetary waves, the polar vortex in 2019–2020 remained stable until the end of April, which created the conditions for record ozone destruction in the Arctic. We present variations of the horizontal dynamic structure obtained using reverse domain filling (RDF) and the vortex strength represented as an M function depending on time and altitude. Variations in ozone and thermodynamic parameters averaged over the ensemble of trajectories inside the vortex using the ERA5 reanalysis data are also presented.

中文翻译：

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2019-2020 年冬季观测到的异常稳定北极平流层涡旋的拉格朗日研究

摘要

我们展示了应用拉格朗日方法研究 2019-2020 年冬春季平流层极地涡旋精细动力学结构的结果。将今冬涡结构特征与强极涡和2018-2019年冬季涡弱时的涡结构特征进行比较。由于行星波的低活动性，2019-2020年的极地涡旋一直保持稳定，直到4月底，这为北极臭氧破坏创纪录创造了条件。我们展示了使用反向域填充 (RDF) 获得的水平动态结构的变化，以及根据时间和高度表示为 M 函数的涡流强度。还介绍了使用 ERA5 再分析数据在涡流内部轨迹集合上平均的臭氧和热力学参数的变化。