The study illustrates the evidence of dynamical coupling between the high‐latitude sudden stratospheric warming (SSW) events that occurred in three consecutive winter seasons and the concomitant changes in the wind pattern in the lower stratosphere and troposphere observed with a state‐of‐the‐art 205 MHz stratosphere‐troposphere wind profiling Radar, located at Cochin (10.03°N, 77.33°E), a tropical station in southwest peninsular India. Associated with the occurrence of SSW, the tropical region experiences a change in zonal wind speed and direction at upper tropospheric altitudes after the central day of warming. The zonal wind in the troposphere also reversed its prevailing direction. Downward propagation of zonal wind during the SSW period is noticed, which is also supported by the reanalysis data set. In the lower troposphere, vertical wind experienced sudden fluctuations with varying amplitudes soon after the peak day of the SSW event. The surface meteorological parameters in an area (8°–12°N, 74°–78°E), centered at Cochin, from ERA‐Interim are also examined. An abrupt fall in outgoing longwave radiation, followed by convection and unusual rainfall in the tropical region 5–6 days before the peak of SSW events, is a unique and exciting feature noted in the study. Detailed analysis of the past 20 years of SSW events confirmed the observational evidence of unusual rainfall over the low latitude region related with the onset of SSW. Comprehensive observational and numeric modeling studies are needed to understand the mechanism for the SSW events in high latitudes and the associated convective activity and precipitation in the low latitude region.

中文翻译：

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高纬度平流层突然变暖对热带天气的影响：从205 MHz平流层对流层雷达和地面气象参数的观测

这项研究说明了连续三个冬季发生的高纬平流层突然变暖（SSW）事件与平流层下部和对流层伴随的风型变化同时发生动态耦合的证据。 205 MHz平流层-对流层风廓线雷达，位于印度西南半岛的热带站科钦（10.03°N，77.33°E）。与SSW的发生相关，热带地区在变暖的中心日之后在对流层较高的高度经历了纬向风速和风向的变化。对流层中的纬向风也逆转了其盛行方向。在SSW期间注意到纬向风的向下传播，这也得到了重新分析数据集的支持。在对流层下部，在SSW事件的高峰日后不久，垂直风突然经历了幅度不同的突然波动。还检查了ERA-Interim以科钦为中心的区域（8°–12°N，74°–78°E）中的表面气象参数。在这项研究中，独特的，令人振奋的特征是，长波辐射的突然下降，然后在南半球西南偏南事件发生前5-6天，对流和异常降雨在热带地区出现。对过去20年SSW事件的详细分析证实了与SSW发作有关的低纬度地区异常降雨的观测证据。需要进行全面的观测和数值模拟研究，以了解高纬度SSW事件的机制以及低纬度地区相关的对流活动和降水。