FY2 号气象卫星估算地面太阳辐射研究

综合考虑太阳因素、地形因素、地表积雪覆盖情况、云量以及非均质大气对太阳辐射的影响，基于FY2 号静止卫星构建晴空太阳总辐射计算模型，并利用山西省3 个辐射观测站2011 年逐时、逐日、逐月太阳总辐射观测资料对其估算结果进行检验。研究结果显示：逐时误差在±1 MJ·m^-2之间，逐日误差在±5 MJ·m^-2之间，表明模型计算的太阳辐射误差较小，稳定性较好；逐月误差结果显示，三个站模拟值都大于实测值，且误差趋势一致，均表现为冬季误差高于夏季；进一步对模拟值和实测值进行相关性分析，三站线性拟合度均在0.86～0.92 之间，且相关系数均达到显著相关水平，表明模型计算的太阳辐射准确性和精度较高，且在数值拟合上较好地反映了实际的太阳总辐射量，证实该模型应用于FY2 号气象卫星的可行性。

Reaearch on Estimation of Solar Radiation via FY-2 Weather Satellite Data

A model was constructed to estimate the clear sky global solar radiation via FY-2 Weather Satellite data with the consideration of sun, topography, snow cover, cloud cover as well as the influence of heterogeneous atmosphere. And the performance of this model was examined with the application of hourly, daily and monthly solar radiation data (observed in 2011) from three observation sites located in Shanxi Province. Results indicated that the relative errors of hourly estimations were ±1 MJ·m^-2 and that of daily estimations were ±5 MJ·m^-2, i.e. the estimation of this model was satisfied with small errors as well as stability. As to the analysis of monthly performance, the estimations of the three observation sites were higher than the observations but all of these estimations were with similar error distributions as well as same characteristic of larger errors in winter than that in summer. And the perfect goodness-of-fit of 0.86 to 0.92 and high correlation coefficients meeting significantly correlated level were also investigated by the further correlation analysis between the estimations of this model and the observations and that further show the high accuracy and precision of this model which could output satisfied global solar radiation and thus verified the feasibility of the application of this model with FY-2 Weather Satellite data.