基于改进的MT-CLIM模型的中高纬低山丘陵区太阳辐射模拟——以小兴安岭为例

Solar radiation simulation of low hilly land in high latitude based on improved MT-CLIM model-Taking the Xiaoxinganling Mountains for Example

将DEM、坡度和坡向作为地形因子,基于ENVI/IDL编写MT-CLIM模型批量处理程序,使用改进MTCLIM模型对小兴安岭地区的地面气象台站进行太阳辐射模拟,并将模拟结果分别与辐射台站实测数据和二次趋势面统计模型进行验证。研究结果表明:从整年上,其与辐射台站的拟合精度R2为0.813 3,其中,夏季模拟太阳辐射日值拟合精度偏低,而其与二次趋势面统计模型拟合精度R2值范围为0.571 3~0.793 3;采用改进的MT-CLIM模型模拟较大区域的太阳辐射,比统计模型具有更好的普适性和高效性,能获得较好的中高纬低山丘陵区模拟效果,且为森林生态过程模型的输入参数研究提供依据。

Taking the DEM,gradient and slope direction as terrain factor,this paper writes an MT-CLIM model batch processing program,and then uses the improved MT-CLIM model to simulate the solar radiation of meteorological stations on the ground in Xiaoxinganling Mountains.Compared the model simulation results with radiation stations measured data and the simulation results of the secondary trend surface statistical model,the former of fitting precision R2 is 0.813 3through the whole year,but simulated solar radiation of fitting precision is low in summer than other seasons;the latter of fitting precision R2 is0.571 3to 0.793 3.The results prove that the improved MT-CLIM model which has better effectiveness and efficiency than the statistic model can be used for simulating large area of solar radiation and obtain the better simulating effect than the original model in low hilly land of the high latitude.The results will provid a basis for the research of the input parameters of the forest ecological process model.