起伏地形下河南省太阳散射辐射的分布式模拟

利用河南省及周边145个气象站1961－2000年常规气象观测资料和河南省1:25万DEM数据,充分考虑起伏地形下太阳散射辐射的天空因素与地面因素后,基于分布式开阔度模型和天文辐射模型,实现了起伏地形下河南省太阳散射辐射的分布式模拟.计算了100m×100 m分辨率下河南省1－12月气候平均太阳散射辐射及多年平均年散射辐射总量的空间分布.结果表明:在充分考虑经验系数的时空分布特征后,模拟精度有了进一步提高.与郑州站的观测资料对比验证表明,模拟精度较高,年平均绝对误差为3.06 MJ·m-2,年平均相对误差为1.67％；局地地形对太阳散射辐射的影响比较明显；通过个例年验证对模型性能和模拟结果进行考察,年平均相对误差不足11％.综上表明模型的时空模拟性能良好.

Distribution modeling of diffuse solar radiation over rugged terrain in Henan Province

Based on DEM data of 1:250 000 scale and the data from 145 routine observation meteorological stations in Henan Province from 1961 to 2000,after fully considering the sky and rugged terrain elements,the paper realized the simulation of the spatial distribution of diffuse solar radiation(DSR) over rugged terrain in Henan Province with the extraterrestrial solar model and the terrain openness model.Monthly DSR and annual DSR at the resolution of 100 m×100 m over the rugged terrains in Henan Province were calculated.The simulated results show that,after fully considering the spatial-temporal characteristic coefficients,the simulated accuracy can be improved.The observation data from Zhengzhou indicate that the accuracy is high.The annual average error is 3.06 MJ·m^-2 and the annual absolute relative bias error is 1.67%.The local terrain can affect the DSR obviously.The annual average error of case year test is less than 11%.In summary,this model is good in spatial-temporal simulation.