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DOI | 10.1029/2018GL077623 |
Climatic Effect of Antarctic Meltwater Overwhelmed by Concurrent Northern Hemispheric Melt | |
Ivanovic, R. F.1; Gregoire, L. J.1; Wickert, A. D.2,3; Burke, A.4 | |
2018-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:11页码:5681-5689 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA; Scotland |
英文摘要 | Records indicate that 14,500years ago, sea level rose by 12-22m in under 340years. However, the source of the sea level rise remains contentious, partly due to the competing climatic impact of different hemispheric contributions. Antarctic meltwater could indirectly strengthen the Atlantic Meridional Overturning Circulation (AMOC), causing northern warming, whereas Northern Hemisphere ice sheet meltwater has the opposite effect. This story has recently become more intriguing, due to increasing evidence for sea level contributions from both hemispheres. Using a coupled climate model with freshwater forcing, we demonstrate that the climatic influence of southern-sourced meltwater is overridden by northern sources even when the Antarctic flux is double the North American contribution. This is because the Southern Ocean is quickly resalinized by Antarctic Circumpolar water. These results imply that the pattern of surface climate changes caused by ice sheet melting cannot be used to fingerprint the hemispheric source of the meltwater. Plain Language Summary The fastest major sea level rise ever recorded took place 14,500years ago, when sea level rose by 12-22m in under 340years. The extra water came from melting ice sheets, which stretched across North America and northern Europe as well as Greenland and Antarctica. We ran a climate model to test the impact of different meltwater contributions from Antarctica and the Northern Hemisphere ice sheets (North America, Greenland, and Eurasia). Our simulations demonstrate that northern meltwater has a much stronger and longer lasting effect on ocean circulation and climate than Southern Hemisphere melt. Consequently, northern melting overrides the impact of southern melting even when the flux of water from North America is only half the magnitude of the Antarctic flux. This means that past climate records cannot be used to identify the contribution of meltwater from different ice sheets: the northern signal can override the southern signal. |
英文关键词 | AMOC MWP1a meltwater hosing stability ice sheets |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000436249900052 |
WOS关键词 | LAST GLACIAL MAXIMUM ; SEA-LEVEL HISTORIES ; ICE-SHEET ; FRESH-WATER ; OVERTURNING CIRCULATION ; PULSE 1A ; SOUTHERN-OCEAN ; DEGLACIATION ; ATLANTIC ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/27491 |
专题 | 气候变化 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England; 2.Univ Minnesota, Dept Earth Sci, Minneapolis, MN USA; 3.Univ Minnesota, St Anthony Falls Lab, Minneapolis, MN USA; 4.Univ St Andrews, Dept Earth & Environm Sci, St Andrews, Fife, Scotland |
推荐引用方式 GB/T 7714 | Ivanovic, R. F.,Gregoire, L. J.,Wickert, A. D.,et al. Climatic Effect of Antarctic Meltwater Overwhelmed by Concurrent Northern Hemispheric Melt[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(11):5681-5689. |
APA | Ivanovic, R. F.,Gregoire, L. J.,Wickert, A. D.,&Burke, A..(2018).Climatic Effect of Antarctic Meltwater Overwhelmed by Concurrent Northern Hemispheric Melt.GEOPHYSICAL RESEARCH LETTERS,45(11),5681-5689. |
MLA | Ivanovic, R. F.,et al."Climatic Effect of Antarctic Meltwater Overwhelmed by Concurrent Northern Hemispheric Melt".GEOPHYSICAL RESEARCH LETTERS 45.11(2018):5681-5689. |
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