气候变化领域集成服务门户(CCPortal): Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse

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DOI	10.1016/j.epsl.2020.116372
	Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse
	Gauthier M.S.; Kelley S.E.; Hodder T.J.
发表日期	2020
ISSN	0012821X
卷号	544
英文摘要	The duration and intensity of the early Holocene freshening events has been explained by subglacial outburst(s) from Lake Agassiz, the collapse of a Laurentide Ice Sheet ‘saddle’ overlying Hudson Bay, and/or a combination of the two events. Our field evidence provides new radiocarbon ages and geomorphologic observations to assess the deglacial history of this important region, allowing for revision of the sequence of events. We show that the collapse of the Hudson Bay Ice Saddle in southwestern Hudson Bay occurred between 8.57 ± 0.28 ka BP and 8.11 ± 0.19 ka BP. This event was preceded by at least one subglacial-drainage event through numerous newly-mapped subglacial channels onshore of southwestern Hudson Bay. Lake Agassiz may have experienced multiple subglacial drainage events prior to the final HBIS collapse, accounting for the timing discrepancies in freshwater cooling observed in the North Atlantic. Importantly, this new work links the chronology of events on the southwest (land-based) side of the HBIS to the northeast (marine-based) side of the ice sheet. Additionally, this work provides a potential analog for the behaviour of other ice sheets whose beds lie well below sea level, such as the West Antarctic Ice Sheet, during periods of warming climate. © 2020 Elsevier B.V.
关键词	8.2 ka cold event Hudson Bay Ice Saddle Lake Agassiz Laurentide Ice Sheet Quaternary Tyrrell Sea
英文关键词	Barium compounds; Glacial geology; Glaciers; Lakes; Sea level; Early Holocene; Laurentide ice sheets; North Atlantic; Radiocarbon age; Sequence of events; Subglacial channels; Warming climate; West antarctic ice sheets; Ice; deglaciation; drainage; geochronology; geomorphology; Holocene; Laurentide Ice Sheet; outburst; radiocarbon dating; sea ice; subglacial environment; Atlantic Ocean; Atlantic Ocean (North); Canada; Hudson Bay
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/202601
作者单位	Manitoba Geological Survey, Winnipeg, Manitoba, Canada; School of Earth Sciences, University College Dublin, Dublin, Ireland
推荐引用方式 GB/T 7714	Gauthier M.S.,Kelley S.E.,Hodder T.J.. Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse[J],2020,544.
APA	Gauthier M.S.,Kelley S.E.,&Hodder T.J..(2020).Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse.Earth and Planetary Science Letters,544.
MLA	Gauthier M.S.,et al."Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse".Earth and Planetary Science Letters 544(2020).