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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 >Environmental magnetism of Antarctic Late Pleistocene sediments and interhemispheric correlation of climatic events
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Environmental magnetism of Antarctic Late Pleistocene sediments and interhemispheric correlation of climatic events

机译：南极晚更新世沉积物的环境磁学与气候事件的半球间相关性

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摘要

Recent developments in paleomagnetism and environmental magnetism provide new tools for the detailed correlation of climatically induced magnetic mineralogy changes in sedimentary sequences. Studies of these changes contribute to the reconstruction of climate history for the glacial-interglacial cycles of the Late Pleistocene and to the delineation of the range of natural variability for global climate during the past hundred thousands years. Here we show that sharp coercivity minima observed in fine-grained sediments from the continental rise of the western Antarctic Peninsula correlate to the major rapid cooling events of the northern Atlantic (Heinrich layers). We interpret such an environmental magnetic signal in terms of variations in deep sea diagenetic processes of sulfide formation, which reflect changes in the input of detrital organic matter controlled by sea-ice extent. With the inherent uncertainties in age controls, the sedimentary paleoclimatic markers of the two hemispheres are almost contemporaneous, but interhemispheric time lags or leads of the order of 1-2 kyr (such as those recently reported from the Greenland and Antarctic ice cores) are also compatible with the data.
机译：古磁学和环境磁学的最新发展为气候相关的磁性矿物学变化与沉积序列的详细关联提供了新的工具。这些变化的研究有助于重建晚更新世的冰川-冰川间期的气候历史，并勾勒出过去十万年来全球气候的自然变异范围。在这里，我们表明，在南极半岛西部大陆上升的细粒沉积物中观察到的最小矫顽力最小值与北大西洋（Heinrich层）的主要快速冷却事件有关。我们根据硫化物形成的深海成岩过程中的变化来解释这种环境磁信号，这反映了受海冰程度控制的碎屑有机物输入的变化。由于年龄控制存在内在的不确定性，两个半球的沉积古气候标志几乎是同时期的，但半球间的时间滞后或超前时间约为1-2年（例如最近从格陵兰和南极冰芯报道的时间滞后或超前）。与数据兼容。

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