对数比变换在因子分析法提取东亚冬季风敏感粒级中的应用——以南黄海中部泥质区H07孔为例

发布时间：2018-10-15 08:04

【摘要】：利用经典统计学分析等传统方法提取东亚季风敏感粒级时,往往因忽视了成分数据的闭合效应而造成对分析结果的误读,所确定的季风替代指标与已有指标的对应效果也不甚理想。以南黄海中部泥质区H07岩心为例,尝试对原始粒度数据做中心化对数比变换以消除闭合效应,再通过因子分析法从中提取出东亚冬季风敏感粒级,进而提出将F2因子得分值作为东亚冬季风强度的替代指标。结合AMS14 C年代数据,重建了近6 200aBP来的东亚冬季风演化历史,并将其划分为5个阶段:(1)6.2~4.99kaBP,高水平强烈波动期;(2)4.99~3.66kaBP,高水平小幅波动期;(3)3.66~0.87kaBP,低水平亚稳定期;(4)0.87~0.14kaBP,持续增强期;(5)0.14kaBP至今,大幅减弱期。所提取的替代指标与其他气候指标有很好的对应,证明将中心化对数比变换引入到季风敏感粒级的提取过程中是可行的,能有效地揭示出更接近于真实的中国东部地区东亚冬季风演化历史。
[Abstract]:When using traditional methods such as classical statistical analysis to extract the sensitive grain size of East Asian monsoon, the results are often misread because the closure effect of component data is ignored. The corresponding effect between the monsoon substitution index and the existing index is also not satisfactory. In order to eliminate the closure effect, the core of H07 core in the middle part of Huang Hai in the south of China is attempted to centralize the logarithmic ratio of the original granularity data to eliminate the closure effect, and the sensitive grain size of the East Asian Winter Monsoon is extracted by factor analysis. Furthermore, the F _ 2 factor score is proposed as an alternative index of East Asian winter monsoon intensity. Based on the AMS14 C dating data, the evolution history of the East Asian winter monsoon in the past 6 200aBP has been reconstructed and divided into five stages: (1) 6.2U 4.99kaBP, high level strong fluctuation period; (2) 4.993.66kaBP, high level small fluctuation period; (3) 3.660.87kaBPP, low level substable period; (4) 0.87g 0.14kaBP, continuous enhancement period; (5) 0.14kaBP, so far, A period of substantial abatement. The results show that it is feasible to introduce the centralization logarithmic ratio transformation into the extraction process of monsoon sensitive grains. It can effectively reveal the evolution history of East Asian winter monsoon in eastern China.
【作者单位】：中国海洋大学海洋地球科学学院;
【基金】：国家自然科学基金委2014年渤黄海海洋学综合考察实验研究(NORC2014-01)
【分类号】：P736.21;P425.42

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