Variation trend of direct and diffuse radiation in China over recent 50 years
Variation trend of direct and diffuse radiation in China over recent 50 years
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DOI：
10.7498/aps.60.069601
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
Ma Jin-yu;Liang Hong;Luo Yong;Li Shi-kui
中科院分区：
文献类型：
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作者：
Ma Jin-yu;Liang Hong;Luo Yong;Li Shi-kui
利用1961—2009年中国14个台站和1961—1991年中国49个台站的太阳直接辐射和扩散辐射资料，采用线性回归（以时间为自变量）、小波分析和Mann-Kendall统计检验等方法，从年代际变化、长期季节变化、年代际异常、周期和突变等不同方面分析了直接辐射和扩散辐射的特征。结果如下：1)利用归一化气候趋势系数揭示了直接辐射和漫射辐射的气候趋势的时空分布。同时，这些结果具有可比性。(2)中国的太阳直接辐射和漫射辐射呈下降趋势，但在区域、年际和季节趋势上存在较大差异。3)根据观测站的地理分布特点，根据气候带对站址占比进行分类和统计分析，可以明显看出辐射的长期变化具有区域差异和局部差异的特点。4)利用小波和Mann-Kendall检验方法，统计结果表明，不同区域的辐射具有不同的周期和突变。5)大部分大城市的直接辐射和漫射辐射的长期变化比其他城市更明显地呈下降趋势。一些。也有研究表明，这种气候现象可能是由与城市间发展速度差异相关的城市化环境因素变化引起的。
Using the direct and diffuse solar radiation data during 1961—2009 from 14 stations and during 1961—1991 from 49 stations in China, and the method of linear regression (taken time as an independent variable), wavelet analysis and Mann-Kendall statistical test, we analyze the characteristics of the direct and diffusion radiation from different aspects including decadal variation, long-term seasonal change, inter-decadal anomaly, cycle and abrupt change. The results are as follows. 1) The spatial and temporal distribution of the climatic trend for the direct and diffuse radiation are revealed by using the normalized climatic tendency coefficient. At the same time, these results are comparable. 2) The direct solar and diffuse radiation in China show decreasing trend, but there are many differences in region, inter-annual and seasonal trend. 3) Based on the characteristics of the geographical distribution on observation stations and according to the climate zone, the classification and the statistical analysis of the percentage of site occupation the long-term changes of the radiation can be clearly shown to have the characteristics of area and local difference. 4) Using wavelet and Mann-Kendall test method, the statistical results show that the radiations in different regions have different periods and abrupt change. 5)The long-term variations of the direct and diffuse radiation in most big cities turn to decrease more obviously than in other cities. Some. Other studies show that such a climatic phenomenon may be caused by environmental factor change of urbanization related to the difference in development speed between cities.