大气和海洋科学快报（英文版）2021，Vol.14Issue(2)：7-12,6.
香河站太阳辐射识别晴空方法的评估
Evaluation of multiple surface irradiance-based clear sky detection methods at Xianghe—A heavy polluted site on the North China Plain
摘要
Abstract
Surface irradiance measurements with high temporal resolution can be used to detect clear skies,which is a critical step for further study,such as aerosol and cloud radiative effects.Twenty-one clear-sky detection(CSD)methods are assessed based on five years of 1-min surface irradiance data at Xianghe—a heavily polluted station on the North China Plain.Total-sky imager(TSI)discrimination results corrected by manual checks are used as the benchmark for the evaluation.The performance heavily relies on the criteria adopted by the CSD methods.Those with higher cloudy-sky detection accuracy rates produce lower clear-sky accuracy rates,and vice versa.A general tendency in common among all CSD methods is the detection accuracy deteriorates when aerosol loading increases.Nearly all criteria adopted in CSD methods are too strict to detect clear skies under polluted conditions,which is more severe if clear-sky irradiance is not properly estimated.The mean true positive rate(CSD method correctly detects clear sky)decreases from 45％for aerosol optical depth(AOD)≤0.2％to 6％for AOD＞0.5.The results clearly indicate that CSD methods in a highly polluted region still need further improvements.关键词
晴空识别/太阳辐射/污染/全天空成像仪Key words
Clear-sky detection methods/Surface irradiance/Pollution/Total-sky imager引用本文复制引用
Mengqi Liu,Jinqiang Zhang,Xiangao Xia..香河站太阳辐射识别晴空方法的评估[J].大气和海洋科学快报（英文版）,2021,14(2):7-12,6.基金项目
This work was supported by the National Key R&D Program of China[grant number 2017YFA0603504],the Strategic Priority Re-search Program of the Chinese Academy of Sciences[grant number XDA17010101],and the National Natural Science Foundation of China[grant number 41875183]. （）
