气候变化领域集成服务门户(CCPortal): Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago

CCPortal

DOI	10.1038/s41561-020-0567-4
	Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago
	Brendryen J.; Haflidason H.; Yokoyama Y.; Haaga K.A.; Hannisdal B.
发表日期	2020
ISSN	17520894
起始页码	363
结束页码	368
卷号	13 期号:5
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.
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
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206755
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
推荐引用方式 GB/T 7714	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],2020,13(5).
APA	Brendryen J.,Haflidason H.,Yokoyama Y.,Haaga K.A.,&Hannisdal B..(2020).Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago.Nature Geoscience,13(5).
MLA	Brendryen J.,et al."Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago".Nature Geoscience 13.5(2020).