数字日照计和直接辐射表数据对比研究

Study on Data Comparison Between Digital Sunshine Duration Instrument and Pyrheliometer

选取了两个同时配备一级直接辐射表和光电式数字日照计的气象观测站点,利用选定时间段的数据对比分析,以直接辐射表的数据作为日照时数参考值,所选时间段内两台站的光电式数字日照计日照时数相对误差均未超过±5%,小于规范要求的±10%的误差范围,初步验证了数字式日照计业务应用观测数据质量,为更大范围和更长时间的日照时数观测数据分析提供了思路。

Two surface meteorological observation stations which equipped with standard pyrheliometer both and photoelectric digital sunshine duration instrument were chosen in this study,and comparative analysis was made using data with selected time periods of these stations.We took the data of standard pyrheliometer as the reference value of sunshine duration in this study.The comparison results show that the relative errors of the sunshine duration instrument in the selected stations do not exceed±5%,which is less than the range of±10%required by relevant specification.According to the comparison results,the observation data quality of sunshine duration in practical application is preliminarily verified and an idea for the analysis of sunshine duration observation data in a wider range and longer time is provided.