根据1961—2017年气候要素资料,采用Hybrid模型估算河套平原日值太阳辐射,并利用线性倾向估计、累积距平、M-K检验、小波分析、交叉小波等方法,分析河套平原地表太阳辐射变化特征,探究其与气象要素的相互关系。结果表明：（1） 近57 a河套平原地面接收太阳辐射年平均值为6030.83 MJ·m^-2,以0.3 MJ·（10a）^-1的速率呈缓慢减少趋势。（2） 季节特征显著,全年太阳辐射主要集中在夏季,冬季最少,春季辐射以8.59 MJ·（10a）^-1速率呈显著上升趋势,夏、秋季辐射均为略微下降趋势,冬季辐射以7.06 MJ·（10a）^-1速率呈显著下降趋势。（3） 年突变点在1993年,春季突变点为1972年、1993年,夏季突变点为1967年、1997年,秋季突变发生于2014年,冬季突变于1984年。（4） 河套平原年太阳辐射量振荡主周期为24 a,春夏季均以27 a为主周期,秋季为30 a,冬季辐射主周期为21 a。河套平原太阳辐射与气象要素均存在32 a的共振周期,日照时数与辐射的相关性最大,气温与气压次之,相对湿度与辐射的相关性较小。（5） 气温与太阳辐射在1986—1991年,2001—2006年等多时间尺度上主要呈正相关关系。气压与太阳辐射在1976—1981年存在正相关关系。相对湿度与太阳辐射在8~16 a和16~32 a两个共振周期存在负相关。日照时数与太阳辐射存在显著正相关关系,分别在1973—1981年、1986—1995年、1997—2005年左右存在两者共振高值能量区。

Based on climatic element data from the Hetao Plain collected between 1961 and 2017, a hybrid model was used to estimate the daily solar radiation in the Hetao Plain. Using a trend method, cumulative anomalies, an M-K test, wavelet analysis, cross wavelets, and other methods, the characteristics of solar radiation changes in the Hetao Plain were analyzed. Concurrently, the relationship with meteorological elements was also assessed. In the past 57 years, the annual average solar radiation received at the ground level in the Hetao Plain was 6030.83 MJ·m^-2, which represents slow decrease at a rate of 0.3 MJ·(10a)^-1. Seasonal characteristics were significant; the annual solar radiation was mainly concentrated in the summer (2138 MJ·m^-2) and was at its lowest levels in winter (793 MJ·m^-2). Furthermore, spring radiation showed a significant upward trend at a rate of 8.59 MJ·(10a)^-1, whereas summer and autumn radiation showed a slight downward trend, and winter radiation showed a significant downward trend at a rate of 7.06 MJ·(10a)^-1. The annual solar radiation mutation point in the Hetao Plain were in 1993; 1972 and 1993 were the spring mutation points; 1967 and 1997 were the summer mutation points; 2014 was the autumn mutation point; and 1984 was the winter mutation point. Wavelet analysis results show that 24 years was the main cycle of annual solar radiation in the Hetao Plain; the main periods of radiation were 27 years for spring and summer, 30 years for autumn, and 21 years for winter. Both the solar radiation and meteorological elements in the Hetao Plain had a 32-year resonance period. The number of hours of sunshine had the highest correlation with radiation followed by temperature and air pressure, whereas the correlation between relative humidity and radiation was relatively low. Temperature and solar radiation were mainly positively correlated on multiple time scales, e.g., 1986-1991 and 2001-2006. There was a positive correlation between air pressure and solar radiation from 1976 to 1981. Relative humidity and solar radiation were negatively correlated with two resonant periods of 8-16 and 16-32 years. There is a significant positive correlation between sunshine hours and solar radiation, and there were resonance high-value energy regions in the following periods: 1973-1981, 1986-1995, and 1997-2005.