中文摘要：

基于SBDART辐射传输模式,利用POM-02型天空辐射计观测和反演获得的气溶胶光学参数计算地面总辐射,并与CM21辐射表的观测结果对比以探讨晴天地面总辐射模拟的误差来源。结果表明：地面总辐射对气溶胶单次散射比和水汽柱含量的敏感性较强,模拟中对这2个因子减少50%会分别造成地面总辐射量增加56.99W/m2和减少25.45W/m2。在准确输入水汽柱含量基础上变换大气廓线对地面总辐射计算结果影响甚微。相关性及多元线性回归分析表明,天顶角、气溶胶单次散射比和光学厚度是地面总辐射相对误差的主要来源。利用上述3个因子建立回归方程,回归结果与地面总辐射相对误差的相关系数为0.486（通过了置信度0.01的显著性检验）,说明回归方程能够准确的计算相对误差,利用该方法可以对本站模式计算结果进行修订。

英文摘要：

Solar irradiance was calculated by SBDART radiative transfer model using ground-based aerosol optical data from POM-02 pyranometer, and the source of error in calculation of surface radiation was analyzed by comparing with observational solar irradiance from CM21 radiometer. It is shown that the sensitivity of SSA and water vapor to surface radiation is strong, when these two factors have a 50% decrease, the surface radiation will increase 56. 99 W/m2 and decrease 25. 45 W/m2 respectively. Chan- ging atmospheric profile with accurate water vapor, the difference can be very small. According to cor- relation and multiple linear regression analysis, solar zenith angle, SSA and AOD are main sources of er- rors in solar irradiance calculation, the results of regression equation based on these 3 factors has a posi- tive correlation （0. 486） with the relative errors of surface radiation. With regression equation the re- sults can be revised better.