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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Impacts of post-depositional processes on rapid monsoon signals recorded by the last glacial loess deposits of northern China
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Impacts of post-depositional processes on rapid monsoon signals recorded by the last glacial loess deposits of northern China

机译：沉积后过程对华北最后一次冰期黄土沉积物记录的季风快速信号的影响

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摘要

Rapid East Asian Monsoon oscillations recorded by Chinese loess are thought to be dynamically linked to north Atlantic climate. However, few efforts have been made to assess the effects of post-depositional processes (e.g., surface mixing and pedogenesis) on loess paleoclimatic records. Here a detailed optically stimulated luminescence dating of a thick loess sequence from the western Loess Plateau is presented, offering a reliable chronology for last glacial deposits. Magnetic susceptibility and mean grain size records from three loess-paleosol sequences along a northwest-southeast transect are investigated to evaluate impacts of post-depositional processes on these loess-based proxy records. Our results indicate that: (I) loess sequences developed within the flat tableland of the central and western Loess Plateau are nearly continuous during the last glaciation; and (2) post-depositional processes have distinct impacts on rapid monsoon signals recorded in loess sequences from different regions. In the central Loess Plateau, rapid monsoon signals have been attenuated to various degrees depending on the sedimentation rate and pedogenic intensity. In the northwestern Loess Plateau, however, due to high sedimentation rate and relatively weak pedogenesis, high-resolution grain size oscillations reliably record rapid monsoon changes and can be well correlated to rapid climate changes recorded in the Greenland ice core and Hulu cave stalagmite.
机译：中国黄土记录的东亚季风快速振荡被认为与北大西洋气候动态相关。然而，几乎没有做出努力来评估沉积后过程（例如，表面混合和成岩作用）对黄土古气候记录的影响。这里展示了来自西部黄土高原的厚厚黄土序列的详细的光激发发光年代，为最后的冰川沉积提供了可靠的年代顺序。研究了沿西南-东南样带的三个黄土-古土壤序列的磁化率和平均粒度记录，以评估沉积后过程对这些基于黄土的代理记录的影响。我们的结果表明：（I）在最后一次冰期期间，在中部和西部黄土高原的平坦平原上发育的黄土序列几乎是连续的; （2）沉积后过程对黄土序列中来自不同地区的快速季风信号有明显的影响。在黄土高原中部，根据沉积速率和成岩强度，快速季风信号已减弱到不同程度。然而，在西北黄土高原，由于高沉积速率和相对较弱的成岩作用，高分辨率的粒度波动可靠地记录了季风的快速变化，并且可以与格陵兰冰芯和葫芦洞石笋中记录的快速气候变化密切相关。

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