新型蒸发校准误差修正

Correction and Analysis of New-Type Evaporation Calibration Error

针对新型自动气象站蒸发测量系统现场校准普遍超差的问题进行研究分析,得出超差的根本原因是:测量系统对于基点值(零位值)无负值显示;连通器的设计引入水位补偿。为使蒸发现场校准数据质量的可靠性和有效性控制在允许的范围内,采用重选基点为10mm点,灵敏系数倒数为98.1%的修正方法对校准数据进行处理,经试验验证,新型蒸发校准合格率大大提高。结果表明:该修正方法解决了蒸发现场校准超差问题,使校准的蒸发数据准确可靠,适用于新型蒸发现场校准的数据处理。

This article analyzes the problem of out-of-tolerance error in the field calibration of the new type evaporation measurement system in terms of AWSs.The root cause of the out-of-tolerance error is that the measurement system shows no negative value for the baseline value（zero value）,and the design of the communication unit introduces the water level compensation.In order to control the reliability and validity of the field calibration evaporation data within the allowable range,the calibration data are processed by a correction method（the base point of 10 mm and the reciprocal of the sensitivity coefficient of 98.1% are re-selected）.The test proved that the qualified rate of the new evaporation calibration is greatly improved.The results show that the correction method solves the problem of out-of-tolerance error of evaporation field calibration and makes the calibration data of evaporation more accurate and reliable.Therefore,it is suitable for the data processing of the new type evaporation measurement system in the field calibration.