Dynamic Characteristics of the Stratospheric Polar Vortices

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-05-13 DOI:10.1134/s1028334x24601895

V. V. Zuev, E. S. Savelieva

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Abstract

The dynamic characteristics of the stratospheric polar vortices at the levels from 100 to 1 hPa (minimum vortex area, minimum mean wind speed along the vortex edge, and the minimum wind speed at which there is a dynamic barrier is maintained) are presented for the first time. These parameters were obtained with the use of the vortex delineation method with the geopotential on the basis of the ERA5 reanalysis data. Seasonal changes and the average winter vertical profiles of the vortex area, mean wind speed along the vortex edge, and mean temperature inside the vortex for the Antarctic and Arctic polar vortices were obtained. The average daily probability of the dynamic barrier weakening along the vortex edge in winter was determined on the basis of data for 1979–2021 over the Arctic and Antarctic. It was shown that the lowest probability of the dynamic barrier weakening (and possible breakdown of the polar vortex) in winter can be traced at levels from 30 to 3 hPa and reaches less than 50% in the Arctic and less than 1% in the Antarctic. At the level of 50 hPa, the probability of the dynamic barrier weakening is 53.7% in the Arctic and 1.4% in the Antarctic.

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平流层极地漩涡的动态特征

摘要首次提出了 100 至 1 hPa 层平流层极地涡旋的动态特征（最小涡旋面积、涡旋边缘的最小平均风速以及保持动态屏障的最小风速）。这些参数是在ERA5再分析数据的基础上，利用涡旋划分法和位势法获得的。获得了南极和北极极地漩涡的季节变化和漩涡面积的冬季平均垂直剖面、漩涡边缘的平均风速和漩涡内的平均温度。根据 1979-2021 年北极和南极上空的数据，确定了冬季沿涡边动态屏障减弱的日平均概率。结果表明，冬季动屏障减弱（极地涡旋可能崩溃）的最低概率可追溯到 30 至 3 hPa 的水平，在北极地区低于 50%，在南极地区低于 1%。在 50 百帕高度，北极地区动态屏障减弱的概率为 53.7%，南极地区为 1.4%。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.