摘要:遥感辐射产品的验证研究主要集中在单一产品在青藏高原地区和实测数据的比较分析上，缺乏产品之间的相互比较从而无法得知产品的适用性，因此针对整个中国地区对这些产品的适用性进行系统性的比较研究。选取了数据序列较完整的GEWEX-SRB（Global Energy and Water Cycle Experiment-Surface Radiation Budget）、CERES-EBAF（Clouds and Earth's Radiant Energy Systems-Energy Balanced and Filled）和GLASS-DSR（Global LAnd Surface Satellite-Downward Shortwave Radiation）3种辐射产品，以相关系数、平均偏差、均方根误差为评价指标在整个中国区域范围内进行精度评价，并且对其精度的时空分布特征进行了研究。研究表明，2000~2007年GEWEX-SRB与CERES-EBAF相比两者具有相似的偏差趋势，低估和高估最严重站点同为峨眉山站和太原站，总体上CERES-EBAF的精度更高。2008~2010年间GLASS-DSR与CERES-EBAF进行对比结果表明CERES-EBAF精度要高。总体来说，这3种辐射产品的精度都较高，低估的站点大多地处高海拔地区，其中CERES-EBAF产品时间序列长且精度相对较高，尤其是在中东部及大部分沿海地区精度较高。
关键词:向下短波辐射/
正弦曲线模型/
GEWEX-SRB辐射产品/
CERES-EBAF辐射产品/
GLASS-DSR辐射产品
Abstract:The verification of remote sensing radiation products mainly focuses on comparative analyses of single products and measured data in the Qinghai-Tibet Plateau region. The lack of comparison between the products make it hard to determine the applicability of these products. Therefore, a systematic comparative study of the applicability of these products in China is conducted in the present study. GEWEX-SRB (Global Energy and Water Cycle Experiment-Surface Radiation Budget), CERES-EBAF (Clouds and Earth's Radiant Energy Systems-Energy Balanced and Filled), and GLASS-DSR (Global LAnd Surface Satellite-Downward Shortwave Radiation) radiation products are chosen to verify their accuracy. The correlation coefficient, the mean bias error, and root mean square error are taken as evaluation indexes, and the accuracy of the temporal and spatial distribution of these products in China is discussed. GEWEX-SRB and CERES-EBAF over the period from 2000 to 2007 are compared and analyzed. Results indicate both of them have the same overestimation and underestimation tendencies. The most severe underestimation and overestimation both occur at Mount Emei Station and Taiyuan Station, and the accuracy of CERES-EBAF is higher than that of GEWEX-SRB. GLASS-DSR and CERES-EBAF over the period from 2008 to 2010 are also compared and analyzed. It is found that CERES-EBAF has a higher accuracy. Overall, these three radiation products all have a high accuracy. The underestimated sites are mostly located at high altitudes. The CERES-EBAF product covers a long time period with a relatively high accuracy, especially in eastern China and most of the coastal region in China.
Key words:Downward shortwave radiation/
Sinusoidal model/
GEWEX-SRB radiation product/
CERES-EBAF radiation product/
GLASS-DSR radiation product
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