摘要
ERA5地表下行太阳短波辐射数据是欧洲中期天气预报中心(ECMWF)最新的,具有高时空分辨率的再分析产品,该短波辐射产品可作为陆面模式大气强迫数据之一,并在区域气候评估、农业以及太阳能资源等方面具有重要应用。本文利用中国区域2011—2018年经过质控的91个国家级地面辐射站点观测数据,对其在中国大陆地区的适用性进行多时空尺度的评估,并与ERA-Interim、CFSR、MERRA2共3套全球大气再分析产品和1套CERES卫星反演SYN1deg的产品进行了比较。结果表明:①在月均值尺度上,与其他再分析产品比较,ERA5产品与站点数据的Corr最高(0.939),RMSE最小(28.309 W/m^(2)),Bias(15.4 W/m^(2))略大于ERA-Interim产品(13.2 W/m^(2));CERES卫星反演产品与站点数据的Corr为0.955,RMSE为20.042 W/m^(2),Bias为5.3 W/m^(2);②5套产品的辐射值均高于地面观测数据,存在高估现象,总体上,ERA5产品在中国大陆地区的整体精度高于其他再分析产品,但与CERES卫星反演产品还存在一定差距,日均值比较结论亦具有相似规律。③分区评估结果表明在再分析产品中,ERA5产品在4个区域与观测数据都有更好的一致性,但5套产品均在南部区域表现不佳。并且与东北和北部区域相比,ERA5产品和CERES卫星反演产品在西部区域和观测数据相比的RMSE和Bias也相对偏大。
The European Centre for Medium-Range Weather Forecasts(ECMWF)has developed ERA5,a global atmospheric reanalysis product with high spatiotemporal resolution.The Shortwave Downward Radiation(SWDN)of ERA5 is an important atmospheric forcing dataset which has important applications in regional climate assessment,agriculture,and solar energy resource utilization.In this study,the observed SWDN dataset after quality control was collected from 91 official radiation monitoring stations across China's Mainland in 2011-2018 and was applied to evaluate the SWDN in ERA5 on different spatial and temporal scales,together with other three reference SWDN datasets from global atmospheric reanalysis products(i.e.,ERA-Interim,CFSR,and MERRA2)and the CERES satellite inversion product(SYN1deg).Results show that:①On the monthly mean scale,the ERA5 product had the highest correlation coefficient(Corr)with the station observation data(0.939)and the lowest Root Mean Square Error(RMSE)(28.309 W/m^(2)),compared with other reanalysis products.The average bias of ERA5(15.4 W/m^(2))was slightly higher than that of the ERA-Interim product(13.2W/m^(2)).The Corr between CERES satellite inversion product and observation data was 0.955,the RMSE was 20.042W/m^(2),and the Bias was 5.3W/m^(2);②The radiation values of all these five SWDN products were overestimated against the observation data.In general,the overall accuracy of the ERA5 product in China's Mainland was higher than the other reanalysis products,but was lower than the CERES satellite inversion product.The comparison of daily mean values between products also showed similar results;③Regional evaluation results show that the SWDN in ERA5 had a good consistency with observation data in four regions across China's Mainland.All five SWDN products performed poorly in the southern region.Compared to the northeastern and northern regions,the RSME and the bias of the ERA5 product and the CERES satellite inversion product relative to observations were larger in the western region.
作者
张俊兵
沈润平
师春香
白磊
刘军建
孙帅
ZHANG Junbing;SHEN Runping;SHI Chunxiang;BAI Lei;LIU Junjian;SUN Shuai(School of Geographical Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;National Meteorological Information Center,Beijing 100081,China;University of Chinese Academy of Sciences,Beijing 100046,China;State Key Laboratory of Desert and Oasis,Institute of Ecology and Geography of the Chinese Academy of Sciences,Urumqi 830011,China;Urumqi Desert Meteorological Institute,China Meteorological Administration,Urumqi 830002,China)
出处
《地球信息科学学报》
CSCD
北大核心
2021年第12期2261-2274,共14页
Journal of Geo-information Science
基金
国家重点研发计划项目(2018YFC1506602)
国家自然科学基金重点项目(91437220)~。
关键词
ERA5
地表下行短波辐射
陆面模式
站点观测
中国大陆
评估
全球大气再分析
卫星反演
ERA5
surface downward shortwave radiation
land surface model
station observation
Chinese mainland
evaluate
global atmospheric reanalysis dataset
satellite retrieved algorithm.
