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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 >The Mid-Pleistocene climate transition as documented in the deep South Atlantic Ocean: initiation, interim state and terminal event
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The Mid-Pleistocene climate transition as documented in the deep South Atlantic Ocean: initiation, interim state and terminal event

机译：南大西洋深处记载的中更新世气候过渡：开始，过渡状态和末期事件

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摘要

The Mid-Pleistocene transition (MPT) of the global climate system, initiated by a shift towards much larger northern hemisphere ice shields at around 920 ka and ending with predominance of 100 kyr ice age cyclicity since about 640 ka, is one of the fundamental enigmas in Quaternary climate evolution. Climate proxy records not exclusively linked to global ice volume are necessary to advance understanding of the MPT. Here we present a high-resolution Pleistocene magnetic susceptibility time series of 12 sediment cores from the subtropical South Atlantic essentially reflecting dissolution driven variations in carbonate accumulation controlled by changes in deep water circulation. In addition to characteristics known from δ~(18)O records, the data sets reveal three remarkable features intimately related to the MPT: (1) an all-Pleistocene minimum of carbonate accumulation in the South Atlantic at 920 ka, (2) a MPT interim state of reduced carbonate deposition, indicating that the MPT period may have been a discrete state of the Pleistocene deep water circulation and climate system and (3) a terminal MPT event at around 540-530 ka documented in several peculiarities such as thick laminated layers of the giant diatom Ethmodiscus rex.
机译：基本气候之谜之一是全球气候系统的中更新世过渡（MPT），始于向更大的北半球冰盖转移，始于920 ka左右，最后以100 kyr的冰河时代周期为主导，因为大约640 ka。在第四纪气候演变。并非专门与全球冰量相关的气候代用记录对于增进对MPT的了解是必要的。在这里，我们介绍了来自亚热带南大西洋的12个沉积岩心的高分辨率更新世磁化率时间序列，基本上反映了由深水循环变化控制的碳酸盐岩成藏中溶解驱动的变化。除了从δ〜（18）O记录中获知的特征外，这些数据集还揭示了与MPT密切相关的三个显着特征：（1）南大西洋在920 ka处碳酸盐岩的全更新世最小储量，（2）a MPT减少碳酸盐沉积的过渡状态，表明MPT时期可能是更新世深水循环和气候系统的离散状态，以及（3）约540-530 ka的MPT末期事件，有若干特殊性，如厚层状巨型硅藻Ethmodiscus rex的层。

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