气候变化领域集成服务门户(CCPortal): Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation

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DOI	10.1016/j.epsl.2021.116910
	Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation
	Zhou Y.; McManus J.F.; Jacobel A.W.; Costa K.M.; Wang S.; Alvarez Caraveo B.
发表日期	2021
ISSN	0012821X
卷号	564
英文摘要	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. © 2021 Elsevier B.V.
关键词	Heinrich event IRD flux thorium normalization western North Atlantic
英文关键词	Debris; Glacial geology; Glaciers; Oceanography; Sediments; Thorium; Deep sea sediment; Heinrich Events; Ice rafted debris; Ice-rafted debris flux; Iceberg discharges; Laurentide ice sheets; Sediment core; Thorium normalization; Western north atlantic; Sea ice; glacial sedimentation; Heinrich event; Last Glacial; last glaciation; meltwater; thorium; Indicator indicator
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203378
作者单位	Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Dept. of Earth and Environmental Sciences, Columbia University, New York, NY 10027, United States
推荐引用方式 GB/T 7714	Zhou Y.,McManus J.F.,Jacobel A.W.,et al. Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation[J],2021,564.
APA	Zhou Y.,McManus J.F.,Jacobel A.W.,Costa K.M.,Wang S.,&Alvarez Caraveo B..(2021).Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation.Earth and Planetary Science Letters,564.
MLA	Zhou Y.,et al."Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation".Earth and Planetary Science Letters 564(2021).