globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0567-4
论文题名:
Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago
作者: Brendryen J.; Haflidason H.; Yokoyama Y.; Haaga K.A.; Hannisdal B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:5
起始页码: 363
结束页码: 368
语种: 英语
英文关键词: Bolling ; deglaciation ; human activity ; ice retreat ; ice sheet ; meltwater ; meridional circulation ; paleoenvironment ; proxy climate record ; radiocarbon dating ; sea level change ; Arctic Ocean ; Norwegian Sea
英文摘要: Rapid sea-level rise caused by the collapse of large ice sheets is a threat to human societies. In the last deglacial period, the rate of global sea-level rise peaked at more than 4 cm yr−1 during Meltwater Pulse 1A, which coincided with the Bølling warming event some 14,650 years ago. However, the sources of the meltwater have proven elusive, and the contribution from Eurasian ice sheets has been considered negligible. Here, we present a regional carbon-14 calibration curve for the Norwegian Sea and recalibrate marine 14C dates linked to the Eurasian Ice Sheet retreat. We find that marine-based sectors of the Eurasian Ice Sheet collapsed at the Bølling transition and lost an ice volume of 4.5–7.9 m sea-level equivalents (SLE) over 500 years. During peak melting, 3.3–6.7 m SLE of ice was lost, potentially explaining up to half of Meltwater Pulse 1A. A mean meltwater flux of 0.2 Sv over 300 years was injected into the Norwegian Sea and the Arctic Ocean at a time when proxy evidence suggests vigorous Atlantic meridional overturning circulation. Our reconstruction shows that massive marine-based ice sheets can collapse in as little as 300–500 years. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169565
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作者单位: Department of Earth Science, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway; K.G. Jebsen Centre for Deep Sea Research, University of Bergen, Bergen, Norway; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; Graduate Program on Environmental Sciences, The University of Tokyo, Tokyo, Japan; Biogeochemistry Program, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Recommended Citation:
Brendryen J.,Haflidason H.,Yokoyama Y.,et al. Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago[J]. Nature Geoscience,2020-01-01,13(5)
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