Data-driven Estimation of Cloud Effects on Surface Irradiance at Xianghe,a Suburban Site on the North China Plain

作     者：Mengqi LIU Jinqiang ZHANG Hongrong SHI Disong FU Xiang'ao XIA Mengqi LIU;Jinqiang ZHANG;Hongrong SHI;Disong FU;Xiang'ao XIA

作者机构：Key Laboratory of Atmospheric SoundingChengdu University of Information TechnologyChengdu 610225China Key Laboratory of Middle Atmosphere and Global Environment ObservationInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science&TechnologyNanjing 210044China 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2022年第39卷第12期

页      面：2213-2223页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41875183,41805021) the National Key R&D Program of China(Grant No.2017YFA0603504) 

主　　题：cloud radiative effect solar radiation cloud fraction cloud-radiation interaction 

摘      要：Clouds are a dominant modulator of the energy *** cloud shortwave radiative effect at the surface(CRE)is closely related to the cloud macro-and micro-physical *** observation of surface irradiance and cloud properties are needed to narrow uncertainties in *** this study,1-min irradiance and Total Sky Imager measurements from 2005 to 2009 at Xianghe in North China Plain are used to estimate cloud types,evaluate cloud fraction(CF),and quantify the sensitivities of surface irradiance with respect to changes in CF whether clouds obscure the sun or *** annual mean CF is 0.50,further noting that CF exhibits a distinct seasonal variation,with a minimum in winter(0.37)and maximum in summer(0.68).Cumulus occurs more frequently in summer(32%),which is close to the sum of the occurrence of stratus and *** annual CRE is–54.4 W m^(–2),with seasonal values ranging from^(–2)9.5 W m^(–2)in winter and–78.2 W m^(–2)in *** clouds do not obscure the sun,CF is a dominant factor affecting diffuse irradiance,which in turn affects global *** is a positive linear relationship between CF and CRE under sun-unobscured conditions,the mean sensitivity of CRE for each CF 0.1 increase is about 1.2 W m^(–2)[79.5°SZA(Solar Zenith Angle)80.5°]to 7.0 W m^(–2)(29.5°SZA30.5°).When clouds obscure the sun,CF affects both direct and diffuse irradiance,resulting in a non-linear relationship between CF and CRE,and the slope decreases with increasing *** should be noted that,although only data at Xianghe is used in this study,our results are representative of neighboring areas,including most parts of the North China Plain.