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Comparison of the compact dopplar radar rain gauge and optical disdrometer

机译:紧凑型多普勒雷达雨量计和光学测速仪的比较

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The operations of a compact Doppler radar rain gauge (R2S; Raft, FRG) and optical disdrometer (LPM; THIES, FRG) are based on raindrop size distribution (DSD) measurements. We checked the instrumental error of these sensors and compared each sensor with a reference tipping-bucket rain gauge. This is because both rain gauges can detect tine particles and so they can function as rain sensors. The R2S has a measuring bias of rainfall intensity when the drop size distribution differs from the assumed statistical DSD model. The instrumental error on the LPM is small; in fact, the LPM shows good agreement with the reference rain gauge. Where the atmospheric density differs remarkably from the standard elevation, as is the case in highland areas, the R2S requires calibration using a reference rain gauge. The resultant calibration coefficient of the R2S to convert the reading into a reference tipping-bucket rain-gauge equivalent was 0.51 in a forest at an elevation of 1380 m. Further gathering of calibration coefficients obtained at different elevations will improve the R2S's applicability.
机译:紧凑型多普勒雷达雨量计(R2S; Raft,FRG)和光学测速计(LPM; THIES,FRG)的操作基于雨滴大小分布(DSD)测量。我们检查了这些传感器的仪器误差,并将每个传感器与参考倾翻桶雨量计进行了比较。这是因为两个雨量计都可以检测到尖齿,因此它们可以用作雨量传感器。当液滴尺寸分布与假定的统计DSD模型不同时,R2S具有降雨强度的测量偏差。 LPM上的仪器误差很小;实际上,LPM与参考雨量计显示出良好的一致性。在大气密度与标准海拔显着不同的地方(例如在高地地区),R2S需要使用参考雨量计进行校准。在海拔1380 m的森林中,R2S将读数转换为参考小费桶雨量当量所得的校准系数为0.51。进一步收集在不同高度获得的校准系数将提高R2S的适用性。

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