globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1807261116
论文题名:
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period
作者: Sime L.C.; Hopcroft P.O.; Rhodes R.H.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:10
起始页码: 4099
结束页码: 4104
语种: 英语
英文关键词: Abrupt warmings ; Arctic ; climate change ; paleoclimate ; sea ice
Scopus关键词: oxygen 18 ; Article ; controlled study ; glacial period ; Greenland ; mathematical model ; measurement accuracy ; precipitation ; priority journal ; sea ice ; seasonal variation ; temperature
英文摘要: Greenland ice cores provide excellent evidence of past abrupt climate changes. However, there is no universally accepted theory of how and why these Dansgaard–Oeschger (DO) events occur. Several mechanisms have been proposed to explain DO events, including sea ice, ice shelf buildup, ice sheets, atmospheric circulation, and meltwater changes. DO event temperature reconstructions depend on the stable water isotope (δ 18 O) and nitrogen isotope measurements from Greenland ice cores: interpretation of these measurements holds the key to understanding the nature of DO events. Here, we demonstrate the primary importance of sea ice as a control on Greenland ice core δ 18 O: 95% of the variability in δ 18 O in southern Greenland is explained by DO event sea ice changes. Our suite of DO events, simulated using a general circulation model, accurately captures the amplitude of δ 18 O enrichment during the abrupt DO event onsets. Simulated geographical variability is broadly consistent with available ice core evidence. We find an hitherto unknown sensitivity of the δ 18 O paleothermometer to the magnitude of DO event temperature increase: the change in δ 18 O per Kelvin temperature increase reduces with DO event amplitude. We show that this effect is controlled by precipitation seasonality. © 2019 National Academy of Sciences. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163618
Appears in Collections:气候变化与战略

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作者单位: Sime, L.C., Ice Dynamics and Palaeoclimate, British Antarctic Survey, Cambridge, CB3 0ET, United Kingdom; Hopcroft, P.O., School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, B15 2TT, United Kingdom; Rhodes, R.H., Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, United Kingdom, Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom

Recommended Citation:
Sime L.C.,Hopcroft P.O.,Rhodes R.H.. Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(10)
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