The rain parameters derived from the laser OTT second‐generation Particle Size Velocity (Parsivel²), the two‐dimensional video disdrometer (2DVD), and DZZ5 tipping‐bucket rain gauge (RG) during the Integrative Monsoon Frontal Rainfall Experiment (IMFRE) in summer 2018 are compared. The total rainfall amounts observed by Parsivel, 2DVD, and RG during IMFRE were 178.07, 176.76, and 182.5 mm, while their total rainy hours were 113, 113, and 90. The mean D_m (mass‐weighted mean diameter) and LWC (liquid water content) values derived from Parsivel and 2DVD were 1.03 and 1.01 mm and 0.247 and 0.223 g m⁻³. The rainy samples from six Parsivel sites over the middle reaches of the Yangtze River during the 2016–2018 Meiyu seasons have been collected and analyzed. The occurrence frequencies for rain rates (RR) < 5 and >10 mm hr⁻¹ were 83.9% and 7.4%, respectively, but they contributed 30.5% and 52.1% of the total accumulated rainfall. Compared with the results over the lower reaches of the Yangtze River, the total accumulated rainfall percentages for RR < 5 mm hr⁻¹ and RR > 10 mm hr⁻¹ observed at XN site were higher and lower, respectively. The stratiform rain (SR) raindrop size increases with RR over both the middle and lower reaches, whereas the N_w values over the middle reaches are much higher. Opposite to the SR results, the convective rain (CR) raindrops from this study are larger, while their N_w values are similar to one another. For gamma‐type‐size distribution, the μ − λ and Z − R relations are strongly dependent on geographical location.

中文翻译：

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梅雨期中部地区雨滴大小分布及参数的统计特征。

降雨参数来自第二季风季风前降雨实验（IMFRE）期间的激光OTT第二代粒度速度（Parsivel ²），二维视频测速仪（2DVD）和DZZ5翻斗式雨量计（RG）。比较2018年夏季。在IMFRE期间，Parsivel，2DVD和RG观测到的总降雨量分别为178.07、176.76和182.5 mm，而雨季的总降雨量分别为113、113和90。平均D _m（质量加权平均直径）和LWC（来自Parsivel和2DVD的液体水含量）值为1.03和1.01 mm，以及0.247和0.223 gm ^-3。收集并分析了2016-2018年梅雨季长江中游地区六个Parsivel站点的雨水样本。降雨率（RR）<5和> 10 mm hr ^-1的发生频率分别为83.9％和7.4％，但它们占总降水量的30.5％和52.1％。与长江下游地区的结果相比，在XN站点观测到的RR  <5 mm hr ^-1和RR  > 10 mm hr ^-1的总累积降雨百分比分别更高和更低。在中下游地区，层状雨（SR）雨滴的大小随RR的增加而增加，而N中游地区的_w值要高得多。与SR结果相反，这项研究的对流雨（CR）雨滴更大，而它们的N _w值彼此相似。对于伽马类型的大小分布， μ  -  λ和Z  -  R关系在很大程度上取决于地理位置。