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X-band dual-polarization radar-based hydrometeor classification for Brazilian tropical precipitation systems

机译：基于X频段双极化雷达的巴西热带降水系统的水流仪分类

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摘要

The dominant hydrometeor types associated with Brazilian tropical precipitation systems are identified via research X-band dual-polarization radar deployed in the vicinity of the Manaus region (Amazonas) during both the GoAmazon2014/5 and ACRIDICON-CHUVA field experiments. The present study is based on an agglomerative hierarchical clustering (AHC) approach that makes use of dual polarimetric radar observables (reflectivity at horizontal polarization Z(H), differential reflectivity Z(DR), specific differential-phase K-DP, and correlation coefficient rho HV) and temperature data inferred from sounding balloons. The sensitivity of the agglomerative clustering scheme for measuring the intercluster dissimilarities (linkage criterion) is evaluated through the wet-season dataset. Both the weighted and Ward linkages exhibit better abilities to retrieve cloud microphysical species, whereas clustering outputs associated with the centroid linkage are poorly defined. The AHC method is then applied to investigate the microphysical structure of both the wet and dry seasons. The stratiform regions are composed of five hydrometeor classes: drizzle, rain, wet snow, aggregates, and ice crystals, whereas convective echoes are generally associated with light rain, moderate rain, heavy rain, graupel, aggregates, and ice crystals. The main discrepancy between the wet and dry seasons is the presence of both low-and high-density graupel within convective regions, whereas the rainy period exhibits only one type of graupel. Finally, aggregate and ice crystal hydrometeors in the tropics are found to exhibit higher polarimetric values compared to those at midlatitudes.
机译：通过在GoAmazon2014 / 5和Acridicon-Chuva现场实验中，通过展开与巴西热带降水系统相关的主导水流仪类型。本研究基于附聚层聚类（AHC）方法，其利用双偏振雷达可观察（水平偏振Z（H）的反射率，差分反射率Z（DR），特定差分相位K-DP和相关系数rho hv）和从探测气球推断的温度数据。通过湿季数据集评估用于测量聚集簇异化纤维化的聚类细胞聚类方案的敏感性（连杆标准）。加权和病房挂接都表现出更好的能力来检索云微微物理物种，而与质心联动相关的聚类输出定义不久。然后应用AHC方法以研究湿季和干燥季节的微观结构。层状区域由五个水素级别组成：毛毛雨，雨，湿雪，骨料和冰晶，而对流回声通常与小雨，中度雨，大雨，格兰努埃尔，骨料和冰晶相关。湿和干燥季节之间的主要差异是对流区域内的低和高密度Graupel的存在，而下雨的时期只表现出一种类型的Graupel。最后，发现热带地区的聚集体和冰晶水流素仪与中间层的那些相比表现出更高的偏振值。

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  • 来源
    《Atmospheric Measurement Techniques》 |2019年第1期|共27页
  • 作者

    Ribaud Jean-Francois; Toledo Machado Luiz Augusto; Biscaro Thiago;

  • 作者单位

    Ctr Weather Forecast &

    Climate Studies CPTEC Natl Inst Space Res INPE Rodovia Presidente Dutra Km 40 BR-12630000 Cachoeira Paulista SP Brazil;

    Ctr Weather Forecast &

    Climate Studies CPTEC Natl Inst Space Res INPE Rodovia Presidente Dutra Km 40 BR-12630000 Cachoeira Paulista SP Brazil;

    Ctr Weather Forecast &

    Climate Studies CPTEC Natl Inst Space Res INPE Rodovia Presidente Dutra Km 40 BR-12630000 Cachoeira Paulista SP Brazil;

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  • 正文语种 eng
  • 中图分类 计量学;
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