山地太阳散射辐射分布式模拟  

Distributed Modeling of Diffuse Solar Radiation over Rugged Terrains

作　　者：孙娴[1] 姜创业[1] 肖科丽[1] 王越[1] 

机构地区：[1]陕西省气候中心,西安710015

出　　处：《自然资源学报》2009年第2期295-302,共8页Journal of Natural Resources

基　　金：中国气象局气象新技术推广重点项目(CMATG2006Z10)

摘　　要：基于100m×100m分辨率的数字高程模型（DEM）数据，全面考虑了地形因子对太阳散射辐射的影响，改进了开阔度的计算模型，并通过建立陕西省不同时空尺度月散射分量和晴空指数的估算模型，确定了陕西省气候平均情况下月散射系数的空间分布，实现了实际起伏地形下陕西省太阳散射辐射的分布式模拟，计算了陕西省范围内100m×100m分辨率1～12月气候平均太阳散射辐射的空间分布。结果表明：局地地形对太阳散射辐射空间分布的影响比较明显；模拟结果可靠，可进行大数据量处理，适用于遥感图像处理、地理信息系统等数据处理平台。Diffuse solar radiation is an important component of the global radiation reaching the earth. For the influence of terrain factors, calculation of the quantity of mountain terrain is considerably complex. The diffuse solar radiation quantity reaching the rugged terrain is influenced by many local topographic factors. This paper, using the DEM （digital elevation model） data as input and giving an all-sided consideration on factors influencing diffuse solar radiation （DSR）, improved topography openness model, According to theory of diffuse solar radiation on slope, based on diffuse coefficient model established by clearness index and diffuse fraction models for different temporal and spatial scales, a distributed model for calculating DSR over rugged terrains was developed. The mountainous area of Shaanxi province is taken as an example, with a resolution of 100 m × 100 m DEM data as the general characterization of the terrain. Meteorological data used in this study are monthly mean percentage of sunshine from 124 meteorological stations, and monthly solar radiation quantity from 16 meteorological stations. The time series of most of the monitoring data is from 1960 to 2002. The data quality detection is made. The distributions of the DSR quantity for the rugged terrains of Shaanxi province were generated. Based on different monthly observational data sets of solar radiation and routine meteorological observation data, a series of horizontal solar radiation models of different temporal and spatial scales were established. As indicated （ 1 ） the influence of atmosphere on incoming solar radiation was an effective way to fully utilize the meteorological observations to simulate the influence of the sky factors on SSR; （2） the improved computing model of topography openness provided a basis for simulating comprehensively the DSR over mountain terrain; and （3） according to anisotropic scattering model, with DEM data, the distributed models for estimating the DSR over mountainous terrains were dev

关 键 词：太阳散射辐射 山地 分布式模拟 数字高程模型 

分 类 号：P422.1[天文地球—大气科学及气象学]