青藏高原东南缘甘孜黄土磁化率揭示的西南季风演化
以青藏高原东南缘甘孜A剖面黄土-古土壤序列为材料,在磁性地层学研究的基础上,对其高分辨率磁化率记录的多时间尺度气候特征进行了分析。磁性地层学研究结果表明,甘孜A剖面典型风尘堆积的底界年龄约为1.16 Ma。磁化率记录在构造时间尺度上具有明显的阶段性,显示了西南季风演化存在中更新世气候转型。功率谱分析检出典型的偏心率100 ka、斜率41 ka、岁差23 ka轨道周期和11.4、7.5 ka的岁差拍頻周期,指示西南季风演化受天文因素影响,印度季风系统对太阳辐射具有非线性响应和热带特征。...
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Published in | Hăiyang dĭzhĭ yu dĭsĭjĭ dĭzhĭ Vol. 29; no. 5; p. 115 |
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Main Authors | , , , |
Format | Journal Article |
Language | Chinese |
Published |
Beijing
Marine Geology and Quaternary Geology
01.01.2009
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Subjects | |
Online Access | Get full text |
ISSN | 0256-1492 |
DOI | 10.3724/SP.J.1140.2009.05115 |
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Abstract | 以青藏高原东南缘甘孜A剖面黄土-古土壤序列为材料,在磁性地层学研究的基础上,对其高分辨率磁化率记录的多时间尺度气候特征进行了分析。磁性地层学研究结果表明,甘孜A剖面典型风尘堆积的底界年龄约为1.16 Ma。磁化率记录在构造时间尺度上具有明显的阶段性,显示了西南季风演化存在中更新世气候转型。功率谱分析检出典型的偏心率100 ka、斜率41 ka、岁差23 ka轨道周期和11.4、7.5 ka的岁差拍頻周期,指示西南季风演化受天文因素影响,印度季风系统对太阳辐射具有非线性响应和热带特征。 |
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AbstractList | 以青藏高原东南缘甘孜A剖面黄土-古土壤序列为材料,在磁性地层学研究的基础上,对其高分辨率磁化率记录的多时间尺度气候特征进行了分析。磁性地层学研究结果表明,甘孜A剖面典型风尘堆积的底界年龄约为1.16 Ma。磁化率记录在构造时间尺度上具有明显的阶段性,显示了西南季风演化存在中更新世气候转型。功率谱分析检出典型的偏心率100 ka、斜率41 ka、岁差23 ka轨道周期和11.4、7.5 ka的岁差拍頻周期,指示西南季风演化受天文因素影响,印度季风系统对太阳辐射具有非线性响应和热带特征。 |
Author | LIU, Dongyan QIAO Yansong XIE Ruihuang Shasha, PENG |
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Snippet | 以青藏高原东南缘甘孜A剖面黄土-古土壤序列为材料,在磁性地层学研究的基础上,对其高分辨率磁化率记录的多时间尺度气候特征进行了分析。磁性地层学研究结果表明,甘孜A剖面典型风尘堆积的底界年龄约为1.16... |
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SubjectTerms | Beat frequencies Earth orbits Evolution Loess Magnetic permeability Magnetic susceptibility Magnetostratigraphy Monsoons Nonlinear response Paleosols Pleistocene Precession Sequencing Spectral analysis Spectrum analysis |
Title | 青藏高原东南缘甘孜黄土磁化率揭示的西南季风演化 |
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