Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080083 |
Last Century Warming Over the Canadian Atlantic Shelves Linked to Weak Atlantic Meridional Overturning Circulation | |
Thibodeau, Benoit1,2; Not, Christelle1,2; Hu, Jiang3; Schmittner, Andreas4; Noone, David4; Tabor, Clay5; Zhang, Jiaxu6,7; Liu, Zhengyu8 | |
2018-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:22页码:12376-12385 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | The Atlantic meridional overturning circulation (AMOC) is a key component of the global climate system. Recent studies suggested a twentieth-century weakening of the AMOC of unprecedented amplitude (similar to 15%) over the last millennium. Here we present a record of O-18 in benthic foraminifera from sediment cores retrieved from the Laurentian Channel and demonstrate that the O-18 trend is linked to the strength of the AMOC. In this 100-year record, the AMOC signal decreased steadily to reach its minimum value in the late 1970s, where the weakest AMOC signal then remains constant until 2000. We also present a longer O-18 record of 1,500 years and highlight the uniqueness of the last century O-18 trend. Moreover, the Little Ice Age period is characterized by statistically heavier O-18, suggesting a relatively weak AMOC. Implications for understanding the mechanisms driving the intensity of AMOC under global warming and high-latitude freshwater input are discussed. Plain Language Summary Oceanic circulation in the North Atlantic transports huge amounts of water, heat, salt, carbon, and nutrients around the globe. As such, changes in the strength of oceanic currents can yield profound changes in both North American and European climate, in addition to affecting the African and Indian summer monsoon rainfall. In this study, we used geochemical evidence to highlight a slowdown in the North Atlantic Ocean circulation over the last century. This change appears to be unique over the last 1,500 years and could be related to global warming and freshwater input from ice sheet melt. Based on our data, we also suggest that the period often called The Little Ice Age was characterized by a slowdown, of less amplitude than the modern weakening, in the North Atlantic Ocean circulation. Thus, our results contribute to ongoing investigations of the state of the circulation in the North Atlantic by providing a robust reconstruction of its variability over the last 1,500 years. |
英文关键词 | Atlantic meridional overturning circulation global change climate change oceanography stable isotope ocean model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453250000031 |
WOS关键词 | ST-LAWRENCE ESTUARY ; LAURENTIAN CHANNEL ; CARBON ISOTOPES ; SCOTIAN SHELF ; BOTTOM WATERS ; OXYGEN ; OCEAN ; CLIMATE ; SCALE ; VARIABILITY |
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/26522 |
专题 | 气候变化 |
作者单位 | 1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China; 2.Univ Hong Kong, Swire Inst Marine Sci, Hong Kong, Peoples R China; 3.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA; 4.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 5.Univ Connecticut, Ctr Integrat Geosci, Storrs, CT USA; 6.Los Alamos Natl Lab, Computat Phys & Methods CCS 2, Los Alamos, NM USA; 7.Los Alamos Natl Lab, Ctr Nonlinear Studies CNLS, Los Alamos, NM USA; 8.Ohio State Univ, Dept Geog, Atmospher Sci Program, Columbus, OH 43210 USA |
推荐引用方式 GB/T 7714 | Thibodeau, Benoit,Not, Christelle,Hu, Jiang,et al. Last Century Warming Over the Canadian Atlantic Shelves Linked to Weak Atlantic Meridional Overturning Circulation[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(22):12376-12385. |
APA | Thibodeau, Benoit.,Not, Christelle.,Hu, Jiang.,Schmittner, Andreas.,Noone, David.,...&Liu, Zhengyu.(2018).Last Century Warming Over the Canadian Atlantic Shelves Linked to Weak Atlantic Meridional Overturning Circulation.GEOPHYSICAL RESEARCH LETTERS,45(22),12376-12385. |
MLA | Thibodeau, Benoit,et al."Last Century Warming Over the Canadian Atlantic Shelves Linked to Weak Atlantic Meridional Overturning Circulation".GEOPHYSICAL RESEARCH LETTERS 45.22(2018):12376-12385. |
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