中文摘要：

利用大气物理研究所香河观测站12d晴空条件下地表太阳直接和散射辐射观测资料、太阳光度计观测资料反演获得的气溶胶特性参数和水汽柱含量以及Dobson仪观测的臭氧柱总量资料，运用3个辐射传输模式，对地表太阳直接和散射辐射观测和模拟进行了对比分析。结果表明：直接辐射观测和模拟能较好吻合，但散射辐射的观测和模拟之间的差相对较大，模拟与观测的平均偏差为3％～5％，且80％～90％的模拟值高于观测量。与文献结果不同的是我们的模拟偏高量相对较低，而且有10％～20％的模拟低于观测。提高气溶胶特性以及其他输入参数估计精度将提高散射辐射观测和模拟的吻合程度。

英文摘要：

It is of significance to measure and model solar radiation budget on the ground in researches, such as in solar energy utilization, agriculture and global climate change. Based on the surface measured direct-normal and diffuse irradiance data under clear sky in 12 days, the optical properties of aerosols and columnar water vapor retrieved from Cimel, and colunmar ozone observed by Dobson in Xianghe, three radiative transfer models were used to calculate the direct-normal and diffuse surface solar irradiance, then comparisons between measured and modeled irradiance were made. It is shown that modeled direct-normal irradiance is in good agreement with measured. While the modeled mean diffuse irradiance is larger than the measurement by 3% - 5% and about 80% to 90% model estimates are higher than the corresponding measurements. The difference between our results with reports in hteratures is that our model overestimates are lower than their reports and our model estimates are less than the measurements in some cases （ about 10% - 20% ）. There should be some space to improve the agreement of modeled and measured diffuse irradiance if the estimates of aerosol optical properties and other model inputs are improved.