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DOI | 10.1007/s00382-018-4243-y |
Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks | |
Dentith J.E.; Ivanovic R.F.; Gregoire L.J.; Tindall J.C.; Smith R.S. | |
发表日期 | 2019 |
ISSN | 0930-7575 |
起始页码 | 1761 |
结束页码 | 1781 |
卷号 | 52期号:2020-03-04 |
英文摘要 | Low-resolution, complex general circulation models (GCMs) are valuable tools for studying the Earth system on multi-millennial timescales. However, slowly evolving salinity drifts can cause large shifts in climatic and oceanic regimes over thousands of years. We test two different schemes for neutralising unforced salinity drifts in the FAMOUS GCM: surface flux correction and volumetric flux correction. Although both methods successfully maintain a steady global mean salinity, local drifts and subsequent feedbacks promote cooling (≈ 4 °C over 6000 years) and freshening (≈ 2 psu over 6000 years) in the North Atlantic Ocean, and gradual warming (≈ 0.2 °C per millennium) and salinification (≈ 0.15 psu per millennium) in the North Pacific Ocean. Changes in the surface density in these regions affect the meridional overturning circulation (MOC), such that, after several millennia, the Atlantic MOC (AMOC) is in a collapsed state, and there is a strong, deep Pacific MOC (PMOC). Furthermore, the AMOC exhibits a period of metastability, which is only identifiable with run lengths in excess of 1500 years. We also compare simulations with two different land surface schemes, demonstrating that small biases in the surface climate may cause regional salinity drifts and significant shifts in the MOC (weakening of the AMOC and the initiation then invigoration of PMOC), even when the global hydrological cycle has been forcibly closed. Although there is no specific precursor to the simulated AMOC collapse, the northwest North Pacific and northeast North Atlantic are important areas that should be closely monitored for trends arising from such biases. © 2018, The Author(s). |
英文关键词 | Drift; FAMOUS; General circulation model; Meridional overturning circulation; Multi-millennial |
语种 | 英语 |
scopus关键词 | air-sea interaction; climate modeling; correction; general circulation model; hydrological cycle; meridional circulation; oceanic circulation; salinity; surface flux; trend analysis; warming; Atlantic Ocean; Atlantic Ocean (North); Pacific Ocean; Pacific Ocean (North) |
来源期刊 | Climate Dynamics |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/146536 |
作者单位 | School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; NCAS-Climate, Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom |
推荐引用方式 GB/T 7714 | Dentith J.E.,Ivanovic R.F.,Gregoire L.J.,et al. Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks[J],2019,52(2020-03-04). |
APA | Dentith J.E.,Ivanovic R.F.,Gregoire L.J.,Tindall J.C.,&Smith R.S..(2019).Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks.Climate Dynamics,52(2020-03-04). |
MLA | Dentith J.E.,et al."Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks".Climate Dynamics 52.2020-03-04(2019). |
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