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Title: Stability of the Atlantic Meridional Overturning Circulation: A Review and Synthesis

Journal Article · · Journal of Geophysical Research. Oceans
DOI:https://doi.org/10.1029/2019JC015083· OSTI ID:1564586
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [6];  [7];  [8];  [3]; ORCiD logo [1]
  1. Los Alamos National Laboratory Los Alamos NM USA
  2. Joint Institute for the Study of the Atmosphere and Ocean University of Washington Seattle WA USA, Pacific Marine Environmental Laboratory NOAA Seattle WA USA
  3. Ocean and Earth Science, National Oceanography Centre Southampton University of Southampton Southampton UK
  4. Department of Geology &, Geophysics Yale University New Haven CT USA, LOCEAN/IPSL Sorbonne University Paris France
  5. Climate and Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA
  6. Met Office Hadley Centre Exeter UK
  7. Earth and Planetary Sciences University of California Riverside CA USA
  8. National Oceanography Centre Southampton UK

Abstract The notion that the Atlantic Meridional Overturning Circulation (AMOC) can have more than one stable equilibrium emerged in the 1980s as a powerful hypothesis to explain rapid climate variability during the Pleistocene. Ever since, the idea that a temporary perturbation of the AMOC—or a permanent change in its forcing—could trigger an irreversible collapse has remained a reason for concern. Here we review literature on the equilibrium stability of the AMOC and present a synthesis that puts our understanding of past and future AMOC behavior in a unifying framework. This framework is based on concepts from Dynamical Systems Theory, which has proven to be an important tool in interpreting a wide range of model behavior. We conclude that it cannot be ruled out that the AMOC in our current climate is in, or close to, a regime of multiple equilibria. But there is considerable uncertainty in the location of stability thresholds with respect to our current climate state, so we have no credible indications of where our present‐day AMOC is located with respect to thresholds. We conclude by identifying gaps in our knowledge and proposing possible ways forward to address these gaps.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1564586
Alternate ID(s):
OSTI ID: 1564588; OSTI ID: 1571615
Report Number(s):
LA-UR-19-21448
Journal Information:
Journal of Geophysical Research. Oceans, Journal Name: Journal of Geophysical Research. Oceans Vol. 124 Journal Issue: 8; ISSN 2169-9275
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Impact of ocean resolution on coupled air-sea fluxes and large-scale climate: Coupled Air-sea Fluxes journal October 2016
Response of a Strongly Eddying Global Ocean to North Atlantic Freshwater Perturbations journal February 2014
Effect of the potential melting of the Greenland Ice Sheet on the Meridional Overturning Circulation and global climate in the future journal September 2011
Instability of the Atlantic overturning circulation during Marine Isotope Stage 3 journal June 2014
Hydrology and ocean circulation journal January 1982
Icebergs not the trigger for North Atlantic cold events journal April 2015
Response of the Western European climate to a collapse of the thermohaline circulation journal January 2009
The Role of the Gulf Stream in European Climate journal January 2015
The stability of the North Atlantic thermohaline circulation in a coupled ocean-atmosphere general circulation model journal July 1997
Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses journal August 2003
The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models journal February 2009
Influence of Bering Strait flow and North Atlantic circulation on glacial sea-level changes journal January 2010
Rapid interglacial climate fluctuations driven by North Atlantic ocean circulation journal February 1994
Why is no deep water formed in the North Pacific? journal May 1983
Stability of the Atlantic meridional overturning circulation and stratification in a zonally averaged ocean model: Effects of freshwater flux, Southern Ocean winds, and diapycnal diffusion journal September 2011
Response of the Atlantic Ocean circulation to Greenland Ice Sheet melting in a strongly-eddying ocean model: OVERTURNING RESPONSE journal May 2012
Optimal Surface Salinity Perturbations of the Meridional Overturning and Heat Transport in a Global Ocean General Circulation Model journal December 2008

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