气候变化领域集成服务门户(CCPortal): Extracting the buoyancy-driven atlantic meridional overturning circulation

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DOI	10.1175/JCLI-D-19-0590.1
	Extracting the buoyancy-driven atlantic meridional overturning circulation
	Larson S.M.; Buckley M.W.; Clement A.C.
发表日期	2020
ISSN	0894-8755
起始页码	4697
结束页码	4714
卷号	33 期号:11
英文摘要	Variations in the Atlantic meridional overturning circulation (AMOC) driven by buoyancy forcing are typically characterized as having a low-frequency time scale, interhemispheric structure, cross-equatorial heat transport, and linkages to the strength of Northern Hemisphere gyre circulations and the Gulf Stream. This study first tests whether these attributes ascribed to the AMOC are reproduced in a coupled model that is mechanically decoupled and, hence, is only buoyancy coupled. Overall, the mechanically decoupled model reproduces these attributes, with the exception that in the subpolar gyre, buoyancy drives AMOC variations on interannual to multidecadal time scales, yet only the multidecadal variations penetrate into the subtropics. A stronger AMOC is associated with a strengthening of the Northern Hemisphere gyre circulations, Gulf Stream, and northward oceanic heat transport throughout the basin. We then determine whether the characteristics in the mechanically decoupled model can be recovered by low-pass filtering the AMOC in a fully coupled version of the same model, a common approach used to isolate the buoyancy-drivenAMOC.Amajor conclusion is that low-pass filtering the AMOC in the fully coupled model reproduces the buoyancy-driven AMOC pattern and most of the associated attributes, but not the statistics of the temporal variability. The strength of the AMOC-Gulf Stream connection is also not reproduced. The analyses reveal caveats that must be considered when choosing indexes and filtering techniques to estimate the buoyancy-driven AMOC. Results also provide insight on the latitudinal dependence of time scales and drivers of ocean circulation variability in coupled models, with potential implications for measurement and detection of the buoyancydriven AMOC in the real world. © 2020 American Meteorological Society.
英文关键词	Buoyancy; Heat transfer; Ocean currents; Time measurement; Atlantic meridional overturning circulations; Filtering technique; Fully-coupled model; Low-pass filtering; Multi-decadal time scale; Multidecadal variations; Northern Hemispheres; Temporal variability; Low pass filters; atmospheric forcing; buoyancy; heat transfer; meridional circulation; Northern Hemisphere; overturn
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171285
作者单位	Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, United States; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA, United States; Department of Atmospheric Sciences, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL, United States
推荐引用方式 GB/T 7714	Larson S.M.,Buckley M.W.,Clement A.C.. Extracting the buoyancy-driven atlantic meridional overturning circulation[J],2020,33(11).
APA	Larson S.M.,Buckley M.W.,&Clement A.C..(2020).Extracting the buoyancy-driven atlantic meridional overturning circulation.Journal of Climate,33(11).
MLA	Larson S.M.,et al."Extracting the buoyancy-driven atlantic meridional overturning circulation".Journal of Climate 33.11(2020).