Turbulent kinetic energy dissipation rate () in the mid-troposphere (5–12 km) using data obtained from the S–T wind profiler radar located at Kochi (, ) is analyzed for a period of 1595 days, ranging from March 2017 to December 2022, at a vertical resolution of 180 m. The spectral width method was employed for the estimation of after initial data filtering, and corrections for beam and shear broadening. Monthly variations in exhibited a marginal decrease with height. The background wind conditions, such as horizontal wind speed, vertical shear of horizontal wind, and wind direction, have minimal impact vertically. It is found that turbulence is more significantly affected by wind speed and wind direction. Westerly winds, despite being infrequent in the mid-troposphere, emerged as the primary contributors to elevated turbulence values. This observation was attributed to the unique topographical characteristics, creating an interplay of land–sea contrast and orography, leading to enhanced turbulence during westerly winds. During the monsoon season, enhanced turbulence is observed throughout the altitude. The presence of the tropical easterly jet was identified as a significant contributor to the increased wind speed and shear observed during the monsoon season and this alignment correlates with an increase in turbulence.

中文翻译：

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使用印度科钦 205 MHz S-T 雷达对对流层中部湍流动能耗散率进行气候学研究

使用位于高知 (, ) 的 S-T 风廓线雷达获得的数据，对 2017 年 3 月至 12 月期间 1595 天的对流层中层 (5-12 km) 的湍流动能耗散率 () 进行了分析2022年，垂直分辨率为180 m。谱宽法用于初始数据滤波后的估计以及光束和剪切展宽的校正。每月的变化表现出随着身高的增加而略有下降。背景风况，例如水平风速、水平风的垂直切变和风向，对垂直方向的影响最小。研究发现，湍流受风速和风向的影响更为显着。尽管西风在对流层中部并不常见，但却成为湍流值升高的主要因素。这一观察结果归因于独特的地形特征，形成了陆地-海洋对比和地形的相互作用，导致西风期间湍流增强。在季风季节，整个海拔高度的湍流都会增强。热带东急流的存在被认为是季风季节观测到的风速和切变增加的重要因素，这种排列与湍流的增加相关。