中国三种太阳辐射起始数据分布式模拟

天文辐射、干洁大气总辐射和湿洁大气总辐射是太阳辐射模拟的3种重要起始数据。依托Iqbal Model C和起伏地形下干/湿洁大气总辐射模型,实现了水平面和起伏地形下干/湿洁大气总辐射分布式模拟。以DEM数据作为地形的综合反映,结合常规气象资料,计算了水平面和起伏地形下中国1 km×1 km分辨率日天文辐射量、干洁大气总辐射量、湿洁大气总辐射量的空间分布,并对3种太阳辐射起始数据的时空分布特征做了对比分析。结果表明：3种辐射量均遵循随纬向变化的宏观分布规律;水平面干/湿洁大气总辐射量的分布体现了海拔的影响,水平面湿洁大气总辐射量的分布还体现了水汽分布的影响;起伏地形下的3种辐射量能很好的体现坡度、坡向和地形之间相互遮蔽等局部地形特征对辐射量的影响;以干/湿洁大气总辐射作为起始数据,将有助于提高太阳总辐射的模拟精度。

Distributed Modeling of Three Kinds of Initial Data for Global Solar Radiation Simulation in China

Extraterrestrial solar radiation (ESR), Global solar radiation under dry clean air (GSRD) and wet clean air (GSRW) are three kinds of important initial data for global solar radiation simulation. Based on Iqbal Model C and model of GSRD and GSRW over rugged terrain, distributed simulation of GSRD and GSRW over horizontal plane and rugged terrain were achieved. Using DEM data as the general characterization of terrain, combined with meteorological data, the daily ESR, GSRD and GSRW with a resolution of 1 km×1 km over horizontal plane and rugged terrain of China were calculated. Furthermore, the spatio-temporal distribution characteristics of these three kinds of radiation were analyzed. Results suggest that: three kinds of solar radiation all have a progressive decrease trend from south to north in China. The distributions of GSRD and GSRW over horizontal plane reflect the influence of altitude, the distribution of GSRW reflects the influence of water vapor. Three kinds of solar radiation over rugged terrain reflect the influence to solar radiation by the topographical factors such as slope, aspect and terrain inter-shielding. To use GSRD and GSRW as the initial data will help to improve the simulation precision of global solar radiation simulation.