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首页> 外文期刊>Frontiers of earth science >Cloud type identification for a landfalling typhoon based on millimeter-wave radar range-height-indicator data
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Cloud type identification for a landfalling typhoon based on millimeter-wave radar range-height-indicator data

机译：基于毫米波雷达测距高度指示器数据的登陆台风云型识别

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摘要

As a basic property of cloud, accurate identification of cloud type is useful in forecasting the evolution of landfalling typhoons. Millimeter-wave cloud radar is an important means of identifying cloud type. Here, we develop a fuzzy logic algorithm that depends on radar range-height-indicator (RHI) data and takes into account the fundamental physical features of different cloud types. The algorithm is applied to a ground-based Ka-band millimeter-wave cloud radar. The input parameters of the algorithm include average reflectivity factor intensity, ellipse long axis orientation, cloud base height, cloud thickness, presence/absence of precipitation, ratio of horizontal extent to vertical extent, maximum echo intensity, and standard variance of intensities. The identified cloud types are stratus (St), stratocumulus (Sc), cumulus (Cu), cumulonimbus (Cb), nimbostratus (Ns), altostratus (As), altocumulus (Ac) and high cloud. The cloud types identified using the algorithm are in good agreement with those identified by a human observer. As a case study, the algorithm was applied to typhoon Khanun (1720), which made landfall in south-eastern China in October 2017. Sequential identification results from the algorithm clearly reflected changes in cloud type and provided indicative information for forecasting of the typhoon.
机译：作为云的基本属性，准确识别云类型有助于预测登陆台风的演变。毫米波云雷达是识别云类型的重要手段。在这里，我们开发了一种模糊逻辑算法，该算法依赖于雷达测距高度指示器（RHI）数据，并考虑了不同云类型的基本物理特征。该算法被应用于基于地面的Ka波段毫米波云雷达。该算法的输入参数包括平均反射系数强度，椭圆长轴方向，云底高度，云厚度，是否存在降水，水平范围与垂直范围之比，最大回波强度以及强度的标准方差。所识别的云类型为层云（St），层云（Sc），层云（Cu），积雨云（Cb），云层云（Ns），高层云（As），高层云（Ac）和高云。使用该算法确定的云类型与人类观察者确定的云类型非常吻合。作为案例研究，该算法被应用于2017年10月在中国东南部登陆的台风Khanun（1720）。该算法的顺序识别结果清楚地反映了云类型的变化，并为台风的预报提供了指示性信息。

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  • 来源
    《Frontiers of earth science》 |2019年第4期|829-835|共7页
  • 作者

    Cheng Zhoujie; Wei Ming; Zhu Yaping; Bai Jie; Sun Xiaoguang; Gao Li;

  • 作者单位

    Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Forecast & Evaluat Meteoro Nanjing 210001 Peoples R China|Beijing Inst Aviat Meteorol Beijing 100085 Peoples R China;

    Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Forecast & Evaluat Meteoro Nanjing 210001 Peoples R China;

    Beijing Marine Hydrometeorol Ctr Beijing 100071 Peoples R China;

    Beijing Inst Aviat Meteorol Beijing 100085 Peoples R China;

    Beijing Meteorol Ctr Beijing 100038 Peoples R China;

    Taizhou Meteorol Bur Zhejiang Prov Taizhou 317000 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    landfalling typhoon; identification of cloud type; millimeter-wave cloud radar; RHI data; fuzzy logic;

    机译：登陆台风;识别云类型;毫米波云雷达;RHI数据;模糊逻辑;

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