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因受气候因素的强烈影响,中国黄土10Be记录无法直接用于示踪地磁场变化,需开展信号分离研究.针对黄土10Be示踪古地磁场的复杂性和存在的关键问题,结合分离黄土10Be浓度所包含的气候因素和地磁场因素的数理分析方法发展历史,分析了各种方法的优缺点.在原有方法的基础上,引入主成分分析法对洛川和西峰2个黄土剖面的10Be记录进行主成分提取,进一步剔除了残差中可能存在的少量气候因素、噪声等随机信号,定量重建了130ka以来的大气10Be产率,与以往方法相比较取得了更优的结果.将主成分分析应用于复杂地质信号的分离,将有助于解决地质或其他信号分离的难题.
Due to the strong influence of climatic factors, the 10Be records of Chinese loess can not be directly used to track the change of geomagnetic field, and signal separation studies are required.According to the complexity and existing problems of ancient geomagnetic field of loess 10Be tracer, Including the climatic factors and geomagnetic field, and analyzed the advantages and disadvantages of various methods.On the basis of the original method, the principal component analysis was introduced to study the 10Be records of two loess sections in Luochuan and Xifeng Compared with the previous methods, the main components were extracted to further remove the stochastic signals such as small amount of climatic factors and noise which may exist in the residuals and to quantitatively reconstruct the atmospheric 10Be yields since 130 ka. The principal component analysis The separation of complex geological signals will help solve the problem of geological or other signal separation.