基于FY-4A卫星观测估算全天空条件下地表太阳辐照度  

Estimation of surface solar irradiation under all-sky conditions based on FY-4A satellite

作　　者：刘笑 杨丽薇 花家嘉 高晓清 贾东于 LIU Xiao;YANG Li-wei;HUA Jia-jia;GAO Xiao-qing;JIA Dong-yu(Key Laboratory of Atmospheric Boundary Layer of Xiong'an,China Meteorological Administration,Xiong'an 071800,Hebei,China;Key Laboratory of Meteorology and Ecological Environment of Hebei Province,Shijiazhuang 050021,China;Xingtai Meteorological Bureau,Xingtai 054000,Hebei,China;Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Northwest Institute of Eco-environment and Resources of Chinese Academy of Sciences,Lanzhou 730000,China;Meteorological Bureau of Xiong'an New Area,Xiong'an 071800,Hebei,China;College of Urban Environment,Lanzhou City University,Lanzhou 730070,China)

机构地区：[1]中国气象局雄安大气边界层重点开放实验室,河北雄安071800 [2]河北省气象与生态环境重点实验室,石家庄050021 [3]邢台市气象局,河北邢台054000 [4]中国科学院西北生态环境资源研究院,寒旱区陆面过程与气候变化重点实验室,兰州730000 [5]雄安新区气象局,河北雄安071800 [6]兰州城市学院城市环境学院,兰州730070

出　　处：《兰州大学学报(自然科学版)》2025年第2期184-189,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(41805085,42305128);甘肃省科技厅科技计划项目(21JR7RA546)。

摘　　要：为提高全天空条件下地表太阳辐照度(SSI)的估算精度,基于FY-4A/AGRI卫星在甘肃和河北省7个SSI站点的可见光通道数据、观测数据以及McClear晴空模型数据,重新构建Heliosat-2模型中晴空指数和云反照率之间的关系,评估改进后模型的适用性.结果表明,改进的Heliosat-2模型提高了SSI的估算精度,估算的平均偏差绝对值由14.6 W/m^(2)降至3.59 W/m^(2),均方根误差由42 W/m^(2)降至37.54 W/m^(2),决定系数(R^(2))由0.64升至0.69.在不同观测地点、不同季节,估算的效果有所差异.3个验证站的数据中,改进的Heliosat-2模型在围场站的表现最好;估算的秋季SSI的平均偏差绝对值、均方根误差较小,R^(2)=0.7,拟合效果最好;在冬季的平均偏差绝对值最大,R^(2)=0.53,拟合效果较差.In order to improve the estimation accuracy of surface solar irradiation(SSI)under all sky conditions,we improved the relationship between clear sky index and cloud albedo and evaluated the applicability of the improved Heliosat-2 model(IHM)based on FY-4A/AGRI data and observation data at 7 SSI stations in Gansu and Hebei Provinces,and also on the McClear clear sky model data.The results indicated that IHM had enhanced the estimation accuracy of SSI.The absolute value of mean bias difference decreased from 14.6 W/m~2 to 3.59 W/m~2,the root mean square difference decreased from42 W/m~2 to 37.54 W/m~2,and the determination coefficient(R~2)increased from 0.64 to 0.69.The effectiveness of SSI estimation varied among different observation locations and seasons.The three SSI stations,IHM performed best in Weichang station.The absolute value of mean bias difference and the root mean square difference in autumn were relatively small,with R~2=0.7,indicating the best fitting effect.The absolute value of mean bias difference was the highest,with R~2=0.53,indicating poor fitting performance.

关 键 词：地表太阳辐照度 全天空条件 FY-4A/AGRI卫星 Heliosat-2模型 云反照率 

分 类 号：P49[天文地球—大气科学及气象学]