气候变化领域集成服务门户(CCPortal): Evolving AMOC multidecadal variability under different CO2 forcings

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DOI	10.1007/s00382-021-05730-y
	Evolving AMOC multidecadal variability under different CO2 forcings
	Ma X.; Liu W.; Burls N.J.; Chen C.; Cheng J.; Huang G.; Li X.
发表日期	2021
ISSN	0930-7575
起始页码	2445
结束页码	2458
英文摘要	Multidecadal variability of the Atlantic Meridional Overturning Circulation (AMOC) plays a vital role in Earth’s climate variability. Climate change has the potential to alter the causes and characteristics of AMOC multidecadal variability. Here we use a coupled climate model to simulate AMOC multidecadal variability under three distinct atmospheric CO2 concentrations: Last Glacial Maximum, preindustrial, and 4 × preindustrial levels. Firstly, we discover that AMOC multidecadal variability exhibits a shortened period and a reduced amplitude with increasing atmospheric CO2. We find that these changes in AMOC variability are largely related to enhanced ocean stratification in the subpolar North Atlantic with increasing CO2 which in turn changes the characteristics of westward propagating oceanic baroclinic Rossby waves. Our analysis indicates that the shortened period is primarily due to the increased speed of free oceanic Rossby waves, and the reduced amplitude is mainly due to the reduced magnitude of atmospherically-forced oceanic Rossby waves. Mean flow effects, in the form of eastward mean zonal advection and westward geostrophic self-advection, need to be considered as they largely increase the speed of Rossby waves and hence allow for a better estimate of the changes in the period and amplitude of AMOC variability. Secondly, to explore the possible linkage between atmospheric variability and AMOC fluctuations under each CO2 concentration in a qualitative manner, we analyze the relationship between the North Atlantic Oscillation (NAO) and the AMOC and find a significant negative correlation between the two only under the preindustrial levels where the NAO leads the AMOC by 3–11 years. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atlantic Meridional Overturning Circulation; CO2 change; Mean flow effects; Multidecadal variability; North Atlantic Oscillation; Oceanic baroclinic Rossby waves
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/183532
作者单位	State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Department of Earth Sciences and Planetary Sciences, University of California Riverside, Riverside, CA 92521, United States; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA 22030, United States; Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, China; Polar Climate System and Global Change Laboratory, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; University of Chinese Academy of Sciences, Beijing, 100049, China; International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Bei...
推荐引用方式 GB/T 7714	Ma X.,Liu W.,Burls N.J.,et al. Evolving AMOC multidecadal variability under different CO2 forcings[J],2021.
APA	Ma X..,Liu W..,Burls N.J..,Chen C..,Cheng J..,...&Li X..(2021).Evolving AMOC multidecadal variability under different CO2 forcings.Climate Dynamics.
MLA	Ma X.,et al."Evolving AMOC multidecadal variability under different CO2 forcings".Climate Dynamics (2021).