First Observational Evidence for the Role of Polar Vortex Strength in Modulating the Activity of Planetary Waves in the MLT Region
First Observational Evidence for the Role of Polar Vortex Strength in Modulating the Activity of Planetary Waves in the MLT Region
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DOI：
10.1029/2021gl096548
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发表时间：
2022-01
影响因子：
5.2
通讯作者：
Zheng Ma;Yun Gong;Shaodong Zhang;Qihou H. Zhou;Chunming Huang;K. Huang;Guozhu Li
中科院分区：
文献类型：
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作者：
Zheng Ma;Yun Gong;Shaodong Zhang;Qihou H. Zhou;Chunming Huang;K. Huang;Guozhu Li
基于漠河（MH；53.5°N，122.3°E）测量的流星风和再分析数据，我们研究了2019/2020北极冬季中层和低热层（MLT）区域的行星波变化。 2019 年 11 月至 2020 年 3 月，观测到四次平流层极地变暖，包括两次平流层突然变暖（SSW）。发现在 MH 上空 MLT 地区的纬向风中，准 10 日波（Q10DW）在其中 3 次变暖后增强，但在 2020 年 2 月的 SSW 后异常弱。对增强的 Q10DW 的触发机制进行了研究和分析。 2 月份 Q10DW 异常疲软的原因已揭晓。在 2 月 SSW 期间，Q10DW 的向上传播和原位生成均受到限制。我们的分析表明，2020年2月MLT地区的Q10DW很大程度上受到极强涡旋和缺乏中层不稳定的抑制。
Based on the meteor winds measured at Mohe (MH; 53.5°N, 122.3°E) and the reanalysis data, we investigate the variations of planetary waves in the mesosphere and lower thermosphere (MLT) region during the 2019/2020 Arctic winter. Four stratospheric polar warmings, including two sudden stratospheric warmings (SSWs), are observed from November 2019 to March 2020. Quasi‐10‐day waves (Q10DWs) are found to be enhanced following three of these warmings in the zonal winds in the MLT region over MH, but unusually weak after the SSW in February 2020. The trigger mechanisms of the enhanced Q10DWs are investigated and the reason for the unusually weak Q10DWs in February is revealed. Upward propagations and in situ generations of Q10DWs are both limited during the February SSW. Our analysis indicates that Q10DWs in the MLT region in February 2020 are largely inhibited by the extremely strong polar vortex and a lack of mesospheric instability.