Abstract Implementation of dual-polarization radar should allow for improvements in quantitative precipitation estimates due to dual-polarization capability allowing for the retrieval of the second moment of the gamma drop size distribution. Knowledge of the shape of the DSD can then be used in combination with mesoscale model data to estimate the motion and evaporation of each size of drop falling from the height at which precipitation is observed by the radar to the surface. Using data from Central Missouri at a range between 130 and 140 km from the operational National Weather Service radar a rain drop tracing scheme was developed to account for the effects of evaporation, where individual raindrops hitting the ground were traced to the point in space and time where they interacted with the radar beam. The results indicated evaporation played a significant role in radar rainfall estimation in situations where the atmosphere was relatively dry. Improvements in radar estimated rainfall were also found in these situations by accounting for evaporation. The conclusion was made that the effects of raindrop evaporation were significant enough to warrant further research into the inclusion high resolution model data in the radar rainfall estimation process for appropriate locations.

中文翻译：

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使用双极化雷达和中尺度模型数据计算降雨蒸发

摘要 由于双极化能力允许反演伽马液滴尺寸分布的二阶矩，因此双极化雷达的实施应该允许改进定量降水估计。然后可以将 DSD 形状的知识与中尺度模型数据结合使用，以估计从雷达观测到降水的高度落到地表的每种大小的水滴的运动和蒸发。使用来自密苏里州中部 130 至 140 公里范围内的国家气象局雷达数据，开发了雨滴追踪方案以说明蒸发的影响，其中撞击地面的单个雨滴被追踪到空间和时间点它们与雷达波束相互作用的地方。结果表明，在大气相对干燥的情况下，蒸发在雷达降雨估计中发挥了重要作用。通过考虑蒸发，在这些情况下也发现了雷达估计降雨量的改进。得出的结论是，雨滴蒸发的影响足够显着，值得进一步研究在适当位置的雷达降雨估计过程中包含高分辨率模型数据。