称重式降水传感器与翻斗雨量传感器测雨性能对比分析

为了观测降水数据的准确性,选取了南通市4个台站2018年4月—10月份的DCS1型称重式降水传感器和SL3-1型翻斗雨量传感器观测的降水数据,分析两者观测的日降水量和降水总量等方面的差异。结果显示：在选取的观测样本中,以人工观测的降雨日数为参考,称重传感器的平均一致率为91.2%;以翻斗传感器观测的降雨日为参考,称重传感器的一致率为94.5%。称重传感器观测的累积降水量与翻斗传感器观测的累积降水量相对平均误差为-1.55%,符合中国气象局规定的相对误差不超过±4%的规范要求。在分析日降水量方面,发现称重传感器比翻斗传感器观测量平均偏小0.29 mm;有明显性降水时,两者在日降水量等级判别上基本一致。称重传感器观测的数据小于翻斗传感器观测的数据概率要高,两种传感器观测的差值分布较为一致。称重传感器在捕捉微量降水的能力不比翻斗传感器差,甚至更好。称重传感器观测的日降水量与翻斗传感器观测的日降水量相关系数为0.99826,达到0.01显著相关的水平。

Comparison and Analysis of Rain-measuring Performance of Weighing Precipitation Sensor

To observe the accuracy of precipitation data, the precipitation data of the DCS1 weighing precipitation sensor and the SL3-1 somersault rainfall sensor observed at four stations in Nantong City from April to October 2018 were selected. The differences of daily precipitation and total precipitation were analyzed. The results showed that the average uniform rate of weighing sensor was 91.2% in the selected sample, with the number of rainfall days by artificial observation as reference. The uniform rate of weighing sensor was 94.5%, which was a reference to the rainfall day observed by the somersault sensor. The relative average error of accumulated precipitation observed by the weighing sensor and the somersault sensor was -1.55%, which conformed to the specifications stipulated by the China Meteorological Administration that the relative error does not exceed ±4%. In the analysis of the daily precipitation, it was found that the average weight sensor measurement was 0.29 mm smaller than the somersault sensor. When there was process precipitation, the two were basically the same in the daily precipitation level discrimination. The data observed by the weighing sensor was less than the probability observed by the somersault sensor, and the difference between the two sensors was relatively consistent. Weighing sensors were no worse, or even better, at capturing tiny amounts of precipitation. The correlation coefficient between the daily precipitation observed by weighing sensor and the somersault sensor was 0.99826, reaching a significant correlation level of 0.01.