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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Determining the tropopause height from 205 MHz stratosphere troposphere wind profiler radar and study the factors affecting its variability during monsoon
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Determining the tropopause height from 205 MHz stratosphere troposphere wind profiler radar and study the factors affecting its variability during monsoon

机译：从205 MHz平流层对流层风剖面雷达确定对流层高的高度，并研究影响季风中变异性的因素

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摘要

A Stratosphere-Troposphere (ST) wind profiler radar at 205 MHz is operational at Cochin (10.04 N; 76.44 E), India since January 2017 and is providing accurate three-dimensional wind profiles for an altitude range of 315 m to 20 km. In this paper, we present a method to estimate the tropopause altitude from signal to noise ratio (SNR) profiles obtained from the 205 MHz wind profiler radar. The gradient in SNR is used to estimate the cold point tropopause (CPT) height. The CPT height obtained from the ST radar is validated against co-located radiosonde tropopause height measurements and is found to be in very good agreement. The variability of CPT height during monsoon season was studied and the factors responsible for its variability were investigated. It is found that during monsoon season the Tropical Easterly Jet (TEJ) has an inverse relationship with the CPT height, i.e. CPT height increases as the strength of TEJ diminishes and vice versa. A comparison between TEJ core speed and ice cloud water path (ICWP) which represents the strength of deep convection, shows that ICWP decreases as the strength of TEJ increases. Thus, our analysis shows that TEJ affects the tropopause height through changing the concentration of ice clouds.
机译：205 MHz的平流层 - 对流层（ST）风剖面雷达在科钦（10.04 N; 76.44 e），印度自2017年1月以来，正在为315米至20公里的高度范围提供准确的三维风廓线。在本文中，我们提出了一种方法来估计从205MHz风分析器雷达获得的信号到噪声比（SNR）配置文件的对流度高度。 SNR中的梯度用于估计冷点对流层（CPT）高度。从ST雷达获得的CPT高度针对共同定位的无线电探空钻孔高度测量验证，并被发现非常良好。研究了季风季节期间CPT高度的可变性，研究了负责其变异性的因素。结果发现，在季风季节期间，热带复活射流（TEJ）与CPT高度具有反比关系，即CPT高度随着TEJ的强度减少而反之亦然。 TEJ核心速度和冰云水道（ICWP）的比较，它代表了深度对流强度，表明ICWP随着TEJ的强度而降低。因此，我们的分析表明，TEJ通过改变冰云的浓度来影响对流层高度。

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