1993—2013年中国地面太阳辐射的变化特征

根据1993—2013年中国15个省份16个站点的辐射观测数据，采用线性倾向估计分析了近20年来中国不同地区的地面太阳辐射的变化特征，并分析了散射系数（散射辐射和直接辐射之比）的变化情况。结果表明：1993—2013年间地面太阳总辐射在西部和东北地区呈上升趋势，在中部和东部地区呈下降趋势。直接辐射在中部地区呈上升趋势，在其他地区表现为下降趋势。散射辐射和散射系数除了新疆的乌鲁木齐和甘肃的兰州减小外，在所有地区几乎都呈上升趋势。散射辐射最大在东南沿海地区，最小在西北（新疆的乌鲁木齐），但是散射系数在中东部地区相对较大。

Change Characteristics of Surface Solar Radiation in China During 1993-2013

The surface radiation data (19932013) from 16 meteorological stations in 15 provinces of China is applied to analyze the change patterns of surface solar radiation in different region of China in resent 20 years, and diffuse coefficient (the ratio of diffuse radiation and direct radiation) with the linear trend estimation method. Results showed that during 19932013 surface solar total radiation increased in western and northeast China, but decreased in middle and eastern China. Direct radiation decreased in most of China except for middle part of China, while diffuse radiation and diffuse coefficient increased in most of China except for Urumqi and Lanzhou. The diffuse radiation was the most in southeast China, and lest in northwest China (Urumqi). The diffuse coefficient was the bigger in central and eastern China.