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DOI | 10.1073/pnas.1807261116 |
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period | |
Sime, Louise C.1; Hopcroft, Peter O.2; Rhodes, Rachael H.3,4 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:10页码:4099-4104 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
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 (delta O-18) 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 delta O-18: 95% of the variability in delta O-18 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 delta O-18 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 delta O-18 paleothermometer to the magnitude of DO event temperature increase: the change in delta O-18 per Kelvin temperature increase reduces with DO event amplitude. We show that this effect is controlled by precipitation seasonality. |
英文关键词 | abrupt warmings climate change Arctic sea ice paleoclimate |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460242100031 |
WOS关键词 | TEMPERATURE RECONSTRUCTION ; CLIMATE SHIFTS ; COUPLED MODEL ; SIMULATIONS ; VARIABILITY ; CIRCULATION ; GRADIENTS ; CORES |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205059 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.British Antarctic Survey, Ice Dynam & Palaeoclimate, Cambridge CB3 0ET, England; 2.Univ Birmingham, Sch Geog Earth & Environm Sci, Edgbaston B15 2TT, England; 3.Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England; 4.Northumbria Univ, Dept Geog & Environm Sci, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England |
推荐引用方式 GB/T 7714 | Sime, Louise C.,Hopcroft, Peter O.,Rhodes, Rachael 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,2019,116(10):4099-4104. |
APA | Sime, Louise C.,Hopcroft, Peter O.,&Rhodes, Rachael H..(2019).Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(10),4099-4104. |
MLA | Sime, Louise C.,et al."Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.10(2019):4099-4104. |
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