Evaluation of multiple surface irradiance-based clear sky detection methods at Xianghe—A heavy polluted site on the North China Plain

作     者：Mengqi Liu Jinqiang Zhang Xiangao Xia Mengqi Liu;Jinqiang Zhang;Xiangao Xia

作者机构：Key Laboratory of Middle Atmosphere and Global Environment ObservationInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of SciencesBeijingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science&TechnologyNanjingChina 

出 版 物：《Atmospheric and Oceanic Science Letters》 (大气和海洋科学快报（英文版）)

年 卷 期：2021年第14卷第2期

页      面：7-12页

核心收录：

学科分类：080703[工学-动力机械及工程] 07[理学] 070601[理学-气象学] 08[工学] 0807[工学-动力工程及工程热物理] 0706[理学-大气科学] 

基　　金：supported by the National Key R&D Program of China grant number 2017YFA0603504 the Strategic Priority Research Program of the Chinese Academy of Sciences grant number XDA17010101 the National Natural Science Foundation of Chinagrant number 41875183 

主　　题：Clear-sky detection methods Surface irradiance Pollution Total-sky imager 

摘      要：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 ***-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 ***-sky imager(TSI)discrimination results corrected by manual checks are used as the benchmark for the *** performance heavily relies on the criteria adopted by the CSD *** 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 *** 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 *** mean true positive rate(CSD method correctly detects clear sky)decreases from 45%for aerosol optical depth(AOD)≤0.2%to 6%for AOD*** results clearly indicate that CSD methods in a highly polluted region still need further improvements.