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首页> 外文期刊>ournal of the Meteorological Society of Japan >Vertical Wind Characteristics in Precipitating Cloud Systems over West Sumatera, Indonesia, Observed with Equatorial Atmosphere Radar: Case Study of 23-24 April 2004 during the First CPEA Campaign Period
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Vertical Wind Characteristics in Precipitating Cloud Systems over West Sumatera, Indonesia, Observed with Equatorial Atmosphere Radar: Case Study of 23-24 April 2004 during the First CPEA Campaign Period

机译：赤道大气雷达观测到的印度尼西亚西苏门答腊岛上空的降水云系统的垂直风特征：2004年4月23日至24日在CPEA第一个竞选期间的案例研究

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Characteristics of vertical wind profiles (VWPs) in precipitating clouds were studied over western Sumatera (or Sumatra) Island of the Indonesian maritime continent during the first Coupling Process of Equatorial Atmosphere (CPEA) campaign period (10 April-09 May 2004) using Equatorial Atmosphere Radar (EAR) and X-band Doppler radar (XDR) to examine the dynamic and thermodynamic structures of various types of tropical precipitating systems. VWPs were precisely measured with the EAR directly in precipitating clouds, which were identified using simultaneous XDR observation. A super-cloud cluster (SCC) system of the intraseasonal variation (ISV) onset phase was examined as a case study.The SCC consisted of three cloud clusters (CCs), which were further partitioned into convective and stratiform cloud regions based on the XDR reflectivity fields. Vertical winds varied greatly in time and height according to variations in the reflectivity fields. Although the VWPs for each CC showed quite scattered variations in time and height, they had significant dependence on the corresponding 10 dBZ radar echo top heights (H10dBzs). Spectral representations of vertical wind and reflectivity profiles, which were stratified by H10dBz heights, showed the following distinct characteristics: 1) Convective spectra were divided into two groups by H10dBz = 10 km. The shorter spectra had massive reflectivity, especially in the lower height with upward currents; the taller spectra had a gentle reflectivity profile with significant upward currents around H10dBz and apparent downward currents below 8 km in height. 2) Spectra for stratiform clouds were partitioned into three groups by H10dBz = 6 and 8 km. Beside the shortest group of shallow stratiform clouds, bright band signs were intensified as the H10dBz increased in the taller two groups. The heights of the maximum upward currents above their bright bands also increased too with the heights of H10dBz.The reflectivity spectra and VWPs are discussed in comparison to global precipitation spectra observed by the Tropical Rainfall Measuring Mission (TRMM) satellite and VWPs calculated by rawinsonde sounding array data, respectively.
机译：在赤道大气（CPEA）运动的第一次耦合过程（2004年4月10日至5月9日）期间，利用赤道大气研究了印度尼西亚海洋大陆的苏门答腊岛（或苏门答腊岛）西部苏门答腊岛（或苏门答腊岛）上垂直云剖面的特征。雷达（EAR）和X波段多普勒雷达（XDR），用于检查各种类型的热带降水系统的动力学和热力学结构。利用EAR直接在降水云中精确测量VWP，并使用同时XDR观测进行识别。作为案例研究，研究了季节内变化（ISV）发生阶段的超云团（SCC）系统.SCC由三个云团（CC）组成，根据XDR进一步将其分为对流和层状云区域反射率场。垂直风根据反射率场的变化在时间和高度上有很大的不同。尽管每个CC的VWP在时间和高度上都显示出非常分散的变化，但是它们对相应的10 dBZ雷达回波顶部高度（H10dBzs）具有很大的依赖性。由H10dBz高度分层的垂直风和反射率曲线的光谱表示具有以下明显特征：1）对流光谱按H10dBz = 10 km分为两组。较短的光谱具有很高的反射率，特别是在较低的高度中，具有向上的电流;较高的光谱具有柔和的反射率曲线，在H10dBz附近有明显的向上电流，而在高度低于8 km时则有明显的向下电流。 2）层状云的光谱按H10dBz = 6和8 km分为三组。在最短的一组浅层云中，随着较高的两组中H10dBz的增加，亮带信号增强。随着H10dBz高度的增加，最大向上流的高度也随之增加。与热带雨量测量任务（TRMM）卫星观测的全球降水光谱和拉丁探空仪测得的VWP相比，讨论了反射率光谱和VWPs数组数据。

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