Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4243-y |
Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks | |
Dentith, Jennifer E.1; Ivanovic, Ruza F.1; Gregoire, Lauren J.1; Tindall, Julia C.1; Smith, Robin S.2 | |
2019-02-01 | |
发表期刊 | CLIMATE DYNAMICS
![]() |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:1761-1781 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
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 (approximate to 4 degrees C over 6000years) and freshening (approximate to 2 psu over 6000years) in the North Atlantic Ocean, and gradual warming (approximate to 0.2 degrees C per millennium) and salinification (approximate to 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 1500years. 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. |
英文关键词 | Drift Meridional overturning circulation Multi-millennial General circulation model FAMOUS |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460902200027 |
WOS关键词 | DEEP-WATER FORMATION ; EARTH-SYSTEM MODEL ; BERING STRAIT ; NORTH PACIFIC ; VERSION ; TRANSPORTS ; ATLANTIC ; VARIABILITY ; IMPACT ; SEA |
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/35756 |
专题 | 气候变化 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England; 2.Univ Reading, Dept Meteorol, NCAS Climate, Reading RG6 6BB, Berks, England |
推荐引用方式 GB/T 7714 | Dentith, Jennifer E.,Ivanovic, Ruza F.,Gregoire, Lauren J.,et al. Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks[J]. CLIMATE DYNAMICS,2019,52:1761-1781. |
APA | Dentith, Jennifer E.,Ivanovic, Ruza F.,Gregoire, Lauren J.,Tindall, Julia C.,&Smith, Robin S..(2019).Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks.CLIMATE DYNAMICS,52,1761-1781. |
MLA | Dentith, Jennifer E.,et al."Ocean circulation drifts in multi-millennial climate simulations: the role of salinity corrections and climate feedbacks".CLIMATE DYNAMICS 52(2019):1761-1781. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论