Vertically Resolved Convective–Stratiform Echo-Type Identification and Convectivity Retrieval for Vertically Pointing Radars
Vertically Resolved Convective–Stratiform Echo-Type Identification and Convectivity Retrieval for Vertically Pointing Radars
复制标题
垂直分辨对流 - 垂直指向雷达的层状回波类型识别和对流检索
DOI：
10.1175/jtech-d-22-0019.1
复制
发表时间：
2022
影响因子：
2.2
通讯作者：
Dixon, Michael J.
中科院分区：
文献类型：
--
作者：
Romatschke, Ulrike;Dixon, Michael J.
利用机载HIAPER云雷达（HCR）的数据，为垂直指向雷达开发了一种分区算法（ECCO-V），该算法提供垂直分辨对流和对流与层状雷达回波分类。该算法基于反射率和径向速度纹理场的计算，测量云和降水特征的水平均匀性。纹理场被转换成对流，这是对每个数据点的对流或层状性质的数值测量。对流分层分类是通过对流场阈值划分得到的。介绍了基于融层和辐散高度的低、中、高层回波、浅、中、深、高对流回波和混合回波的亚类别。由于该算法提供垂直分辨分类，因此能够识别不同类型的垂直分层回波，以及嵌入在层状云层中的对流特征。根据在不同气象和气候条件下进行的四次HCR实地活动的数据对其稳健性进行了测试。该算法适用于星载和地基雷达，证明了其通用性，因为它不仅适用于不同的雷达类型和波长，而且适用于不同的研究应用。
Using data from the airborne HIAPER Cloud Radar (HCR), a partitioning algorithm (ECCO-V) that provides vertically resolved convectivity and convective versus stratiform radar-echo classification is developed for vertically pointing radars. The algorithm is based on the calculation of reflectivity and radial velocity texture fields that measure the horizontal homogeneity of cloud and precipitation features. The texture fields are translated into convectivity, a numerical measure of the convective or stratiform nature of each data point. The convective–stratiform classification is obtained by thresholding the convectivity field. Subcategories of low, mid-, and high stratiform, shallow, mid-, deep, and elevated convective, and mixed echoes are introduced, which are based on the melting-layer and divergence-level altitudes. As the algorithm provides vertically resolved classifications, it is capable of identifying different types of vertically layered echoes, and convective features that are embedded in stratiform cloud layers. Its robustness was tested on data from four HCR field campaigns that took place in different meteorological and climatological regimes. The algorithm was adapted for use in spaceborne and ground-based radars, proving its versatility, as it is adaptable not only to different radar types and wavelengths, but also different research applications.