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DOI | 10.1007/s00382-016-3106-7 |
An abrupt weakening of the subpolar gyre as trigger of Little Ice Age-type episodes | |
Moreno-Chamarro, Eduardo1,2; Zanchettin, Davide3; Lohmann, Katja1; Jungclaus, Johann H.1 | |
2017-02-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Italy |
英文摘要 | We investigate the mechanism of a decadal-scale weakening shift in the strength of the subpolar gyre (SPG) that is found in one among three last millennium simulations with a state-of-the-art Earth system model. The SPG shift triggers multicentennial anomalies in the North Atlantic climate driven by long-lasting internal feedbacks relating anomalous oceanic and atmospheric circulation, sea ice extent, and upper-ocean salinity in the Labrador Sea. Yet changes throughout or after the shift are not associated with a persistent weakening of the Atlantic Meridional Overturning Circulation or shifts in the North Atlantic Oscillation. The anomalous climate state of the North Atlantic simulated after the shift agrees well with climate reconstructions from within the area, which describe a transition between a stronger and weaker SPG during the relatively warm medieval climate and the cold Little Ice Age respectively. However, model and data differ in the timing of the onset. The simulated SPG shift is caused by a rapid increase in the freshwater export from the Arctic and associated freshening in the upper Labrador Sea. Such freshwater anomaly relates to prominent thickening of the Arctic sea ice, following the cluster of relatively small-magnitude volcanic eruptions by 1600 CE. Sensitivity experiments without volcanic forcing can nonetheless produce similar abrupt events; a necessary causal link between the volcanic cluster and the SPG shift can therefore be excluded. Instead, preconditioning by internal variability explains discrepancies in the timing between the simulated SPG shift and the reconstructed estimates for the Little Ice Age onset. |
英文关键词 | Last millennium North Atlantic Subpolar gyre Abrupt shift Little Ice Age Arctic freshwater export |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394150500002 |
WOS关键词 | NORTH-ATLANTIC ; ATMOSPHERIC BLOCKING ; DECADAL VARIABILITY ; LAST MILLENNIUM ; OCEAN ; SIMULATIONS ; MODEL ; RECONSTRUCTIONS ; TEMPERATURE ; CIRCULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/35750 |
专题 | 气候变化 |
作者单位 | 1.Max Planck Inst Meteorol, Hamburg, Germany; 2.Int Max Planck Res Sch Earth Syst Modeling, Hamburg, Germany; 3.Univ Venice, Venice, Italy |
推荐引用方式 GB/T 7714 | Moreno-Chamarro, Eduardo,Zanchettin, Davide,Lohmann, Katja,et al. An abrupt weakening of the subpolar gyre as trigger of Little Ice Age-type episodes[J]. CLIMATE DYNAMICS,2017,48. |
APA | Moreno-Chamarro, Eduardo,Zanchettin, Davide,Lohmann, Katja,&Jungclaus, Johann H..(2017).An abrupt weakening of the subpolar gyre as trigger of Little Ice Age-type episodes.CLIMATE DYNAMICS,48. |
MLA | Moreno-Chamarro, Eduardo,et al."An abrupt weakening of the subpolar gyre as trigger of Little Ice Age-type episodes".CLIMATE DYNAMICS 48(2017). |
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