小型蒸发器失真记录分析

False Record Analysis of Small Evaporation Pans

为提高小型蒸发器观测记录的准确性，对德州1998年1月至2007年12月蒸发量失真记录（负值、偏大可用、缺测记录），结合当时天气状况等气象因素进行对比分析。结果表明，负值记录占失真记录的54．8％，集中在11至次年2月，多发生在非阵性的小雨（雪）、连阴雨、大雾天气；偏大可用记录、缺测记录多集中在6--8月，多发生在阵性强降水和湿度小、日照强、风大天气；造成失真记录的原因有人为操作不当、特殊天气、操作不科学等因素；针对不同天气条件下避免失真记录的发生提出了相应的处理方法。

In order to enhance the accuracy of the records observed by small evaporation pans, an analysis is made of the false evaporation records from January 1998 to December 2007, including negative-value, greater-than-normal, and missing records, in combination with weather conditions. The results show that the negative occupies 54.8% in false records, mostly in November and next February, under the conditions of light rain （snow）, continuous rain, and bad fog weather; greater-than-normal and missing records appear mostly in June, July, and August under the conditions of showery heavy rainfall, small humidity, strong sunshine, and high wind weather. The causes of false records include improper and unreasonable operations and special weather. Some suggestions to avoid false records are presented corresponding different weather conditions.