Statistical characteristics of raindrop size distributions observed in East China during the Asian summer monsoon season using 2-D video disdrometer and Micro Rain Radar data
Statistical characteristics of raindrop size distributions observed in East China during the Asian summer monsoon season using 2-D video disdrometer and Micro Rain Radar data
复制标题
利用二维视频测速仪和微雨雷达数据观测亚洲夏季风季中国东部地区雨滴粒径分布的统计特征
DOI：
10.1002/2015jd024160
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发表时间：
2016
影响因子：
4.4
通讯作者：
Zhao K
中科院分区：
文献类型：
--
作者：
Wen Long;Zhao Kun;Zhang Guifu;Xue Ming;Zhou Bowen;Liu Su;Chen Xingchao;Wen Long;Zhao Kun;Zhang Guifu;Xue Ming;Zhou Bowen;Liu Su;Chen Xingchao;Zhang Guifu;Xue Ming;Zhang Guifu;Xue Ming;Zhao K;Zhao K
利用地面二维视频测距仪（2DVD）和垂直指向微雨雷达（MRR）的测量结果，研究了中国东部亚洲夏季季风期间雨滴尺寸分布（DSD）和降雨垂直结构的特征。根据降雨强度和雷达反射率垂直结构，将观测到的降雨分为对流型、层状和浅层降水类型。其中，由于传统地表测量的局限性，浅层降水此前一直被忽略或视为异常值。利用先进的2DVD和MRR仪器，对浅层降水的特征进行了量化。此外，从发生频率来看，研究区夏季降雨以层状雨为主，但从累计雨量来看，以对流雨为主。将夏季进一步划分为梅雨季前、梅雨季期间和梅雨季后三个时段表明，夏季DSD的变化主要是由于三种降水类型发生百分比的变化，而整个夏季每种类型的特征基本保持不变。总体而言，与亚洲其他地区的季风降水相比，雨滴浓度更高，直径更小。据推测，局部气溶胶浓度较高是原因。最后，导出并讨论了使用极化雷达测量的降雨估计关系。这些新关系与雨量计测量结果非常吻合，并且比传统关系更准确，尤其是在高降雨率和低降雨率时。
The characteristics of raindrop size distributions (DSDs) and vertical structures of rainfall during the Asian summer monsoon season in East China are studied using measurements from a ground‐based two‐dimensional video disdrometer (2DVD) and a vertically pointing Micro Rain Radar (MRR). Based on rainfall intensity and vertical structure of radar reflectivity, the observed rainfall is classified into convective, stratiform, and shallow precipitation types. Among them, shallow precipitation has previously been ignored or treated as outliers due to limitations in traditional surface measurements. Using advanced instruments of 2DVD and MRR, the characteristics of shallow precipitation are quantified. Furthermore, summer rainfall in the study region is found to consist mainly of stratiform rain in terms of frequency of occurrence but is dominated by convective rain in terms of accumulated rainfall amount. Further separation of the summer season into time periods before, during, and after the Meiyu season reveals that intrasummer variation of DSDs is mainly due to changes in percentage occurrence of the three precipitation types, while the characteristics of each type remain largely unchanged throughout the summer. Overall, higher raindrop concentrations and smaller diameters are found compared to monsoon precipitation at other locations in Asia. Higher local aerosol concentration is speculated to be the cause. Finally, rainfall estimation relationships using polarimetric radar measurements are derived and discussed. These new relationships agree well with rain gauge measurements and are more accurate than traditional relations, especially at high and low rain rates.