globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116372
论文题名:
Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse
作者: Gauthier M.S.; Kelley S.E.; Hodder T.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 544
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164979
Appears in Collections:气候变化与战略

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作者单位: Manitoba Geological Survey, Winnipeg, Manitoba, Canada; School of Earth Sciences, University College Dublin, Dublin, Ireland

Recommended Citation:
Gauthier M.S.,Kelley S.E.,Hodder T.J.. Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse[J]. Earth and Planetary Science Letters,2020-01-01,544
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