DFC3型光电式数字日照计与暗筒式日照计观测数据的差异分析——以电白国家基准站为例

Comparison and Analysis of Sunshine Data between DFC3 Photoelectric Digital Sunshine Recorder and Dark-tube Sunshine Recorder in Dianbai District

该文对电白2019年7月—2020年6月的人工与自动观测日照数据作对比分析,特别是对日出日落时段的日照数据差异进行较详细的分析。结果表明:自动观测日照总时数稍小于人工观测日照总时数;两者有较好的一致性,月日照总时数显著相关,呈现出一定的季节性差异;逐日日照差值主要集中在-1~1 h之间;在日出日落时段,较低能见度和较大相对湿度对人工观测日照数据有较大影响;在气温较高、云系变化快的季节和时段,人工操作不当可能加大与实况的误差,使得人工观测日照数据比自动偏多;在阴雨天或日出日落时段,受自动仪器灵敏度更高及人工操作影响,人工观测日照数据比自动偏少。由此可见自动仪器明显比人工精度高、性能稳、更加灵敏。建议在进行该要素质控和误差订正时,应分不同时段不同天气状况进行。

The artificial and automatic sunshine data of Dianbai from July 2019 to June 2020 are compared and analyzed in detail,especially the difference of sunshine data during sunrise and sunset.The results show that:the automatic sunshine hours were slightly less than artificial sunshine hours,and both have good consistency.The monthly sunshine hours of the two was significantly correlated,and both showed a certain seasonal difference.The daily sunshine difference mainly concentrated in-1 to 1 h.During sunrise and sunset,lower visibility and higher relative humidity should have a greater impact on artificial sunlight.In seasons and periods when the temperature is high and the cloud system changes rapidly,manual operation increases the error with the actual situation which makes it more artificial than automatic.On rainy days or at sunrise or sunset,affected by instrument and manual operation,artificial sunshine hours were less than automatic sunshine hours.The results show that the automatic instrument has higher precision,more stable performance and more sensitive than manual instrument.It is suggested that the quality control and error correction should be carried out according to different weather conditions and different time periods.