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Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation
Earth and Planetary Science Letters ( IF 5.3 ) Pub Date : 2021-03-31 , DOI: 10.1016/j.epsl.2021.116910
Yuxin Zhou , Jerry F. McManus , Allison W. Jacobel , Kassandra M. Costa , Shouyi Wang , Blanca Alvarez Caraveo

A series of catastrophic iceberg and meltwater discharges to the North Atlantic, termed Heinrich events, punctuated the last ice age. During Heinrich events, coarse terrigenous debris released from the drifting icebergs was preserved in deep-sea sediments, serving as an indicator of iceberg passage. Quantifying the vertical flux of ice-rafted debris (IRD) in open-ocean settings can resolve questions regarding the timing and spatial variation in ice sheet calving intensity. In this study, 230Thxs-based IRD flux throughout the last glacial period was measured in a deep-sea sediment core from the western North Atlantic, and complemented by data spanning 0-32 ka from a sediment core in the Labrador Sea. The cores were recovered from sites downstream from Hudson Strait, a likely conduit for icebergs calving from the Laurentide ice sheet (LIS). We compare our results with equivalent existing data from the eastern North Atlantic and show that the two cores in our study have higher IRD fluxes during all Heinrich events, notably including events H3 (∼31 ka) and H6 (∼60 ka). This study demonstrates that the LIS played a role in all Heinrich events, and raises the likelihood that a single mechanism can account for the genesis of these events.



中文翻译:

在上一次冰期发生的所有海因里希事件中,北大西洋西部的冰山排放增加

通往北大西洋的一系列灾难性冰山和融水排放,被称为海因里希事件,标志着最后的冰河时代。在海因里希(Heinrich)事件期间,从漂流的冰山中释放出的粗糙的陆源碎屑被保存在深海沉积物中,作为冰山通过的指示。量化开放海洋环境中浮冰碎片(IRD)的垂直通量可以解决有关冰盖产卵强度的时间和空间变化的问题。在这项研究中,230 Th xs在北大西洋西部的深海沉积岩心中测量了整个上个冰期的基于IRD的通量,并补充了拉布拉多海沉积岩心中范围为0-32 ka的数据。岩心是从哈德逊海峡下游的地点回收的,哈德逊海峡可能是从Laurentide冰盖(LIS)产冰山的管道。我们将结果与北大西洋东部的现有数据进行了比较,结果表明,在所有海因里希事件中,我们的研究中的两个岩心具有较高的IRD通量,特别是事件H3(〜31 ka)和H6(〜60 ka)。这项研究表明,LIS在所有海因里希事件中都发挥了作用,并提高了单一机制可以解释这些事件发生的可能性。

更新日期:2021-03-31
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