Effect of disdrometer sampling area and time on the precision of precipitation rate measurement
Effect of disdrometer sampling area and time on the precision of precipitation rate measurement
复制标题
测速仪采样面积和时间对降水率测量精度的影响
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
T. Garrett
中科院分区：
文献类型：
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作者：
K. Rees;T. Garrett
抽象的。由于降雨的离散性，用雨量计测量连续降雨率会受到统计抽样误差的影响。利用蒙特卡罗模拟获得了雨量探测精度和雨率随碟形仪收集面积的变化关系，并与世界气象组织关于1分钟采样间隔和95 概率的指导原则进行了比较。为了满足这些要求，模拟表明，测量具有雨率的小雨R L 0.50 mm h−1需要至少6 cm × 6 cm的收集面积，并且对于R >； 1 mm h−1，最小收集面积为10 cm × 10 cm。对于R = 0.01 mm h−1，2 cm × 2 cm的收集面积足以检测一滴。模拟结果与使用一种新的热板设备--差示发射率成像散度计的现场测量结果进行了比较。现场结果表明，可能需要一个更大的盘子才能达到所说的精度，尽管原因仍有待确定。
Abstract. Due to the discretized nature of rain, the measurement of a continuous precipitation rate by disdrometers is subject to statistical sampling errors. Here, Monte Carlo simulations are employed to obtain the precision of rain detection and rate as a function of disdrometer collection area and compared with World Meteorological Organization guidelines for a one-minute sample interval and 95 \% probability. To meet these requirements, simulations suggest that measurements of light rain with rain rates R l 0.50 mm h−1 require a collection area of at least 6 cm × 6 cm, and for R > 1 mm h−1, the minimum collection area is 10 cm × 10 cm. For R = 0.01 mm h−1, a collection area of 2 cm × 2 cm is sufficient to detect a single drop. Simulations are compared with field measurements using a new hotplate device, the Differential Emissivity Imaging Disdrometer. The field results suggest an even larger plate may be required to meet the stated accuracy, although for reasons that remain to be determined.