DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Response of Global SSTs and ENSO to the Atlantic and Pacific Meridional Overturning Circulations

Abstract

Consequences from a slowdown or collapse of the Atlantic meridional overturning circulation (AMOC) could include modulations to El Niño–Southern Oscillation (ENSO) and development of the Pacific meridional overturning circulation (PMOC). Despite potential ramifications to the global climate, our understanding of the influence of various AMOC and PMOC states on ENSO and global sea surface temperatures (SSTs) remains limited. Five multicentennial, fully coupled model simulations created with the Community Earth System Model were used to explore the influence of AMOC and PMOC on global SSTs and ENSO. We found that the amplitude of annual cycle SSTs across the tropical Pacific decreases and ENSO amplitude increases as a result of an AMOC shutdown, irrespective of PMOC development. However, active deep overturning circulations in both the Atlantic and Pacific basins reduce ENSO amplitude and variance of monthly SSTs globally. Furthermore, the underlying physical reasons for changes to global SSTs and ENSO are also discussed, with the atmospheric and oceanic mechanisms that drive changes to ENSO amplitude differing based on PMOC state. These results suggest that if climate simulations projecting AMOC weakening are realized, compounding climate impacts could occur given the far-reaching ENSO teleconnections to extreme weather and climate events. More broadly, these resultsmore » provide us with insight into past geologic era climate states, when PMOC was active.« less

Authors:
ORCiD logo [1];  [1];  [1]
  1. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Publication Date:
Research Org.:
National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
OSTI Identifier:
1845078
Grant/Contract Number:  
SC0022070
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Climate
Additional Journal Information:
Journal Volume: 35; Journal Issue: 1; Related Information: Molina, M. J., A. Hu, and G. A. Meehl, 2022: Response of global SSTs and ENSO to the Atlantic and Pacific meridional overturning circulations. Journal of Climate, 35(1), pp.49-72. https://doi.org/10.1175/JCLI-D-21-0172.1.; Journal ID: ISSN 0894-8755
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Meridional overturning circulation; ENSO; Tropical variability

Citation Formats

Molina, Maria J., Hu, Aixue, and Meehl, Gerald A. Response of Global SSTs and ENSO to the Atlantic and Pacific Meridional Overturning Circulations. United States: N. p., 2021. Web. doi:10.1175/jcli-d-21-0172.1.
Molina, Maria J., Hu, Aixue, & Meehl, Gerald A. Response of Global SSTs and ENSO to the Atlantic and Pacific Meridional Overturning Circulations. United States. https://doi.org/10.1175/jcli-d-21-0172.1
Molina, Maria J., Hu, Aixue, and Meehl, Gerald A. Mon . "Response of Global SSTs and ENSO to the Atlantic and Pacific Meridional Overturning Circulations". United States. https://doi.org/10.1175/jcli-d-21-0172.1. https://www.osti.gov/servlets/purl/1845078.
@article{osti_1845078,
title = {Response of Global SSTs and ENSO to the Atlantic and Pacific Meridional Overturning Circulations},
author = {Molina, Maria J. and Hu, Aixue and Meehl, Gerald A.},
abstractNote = {Consequences from a slowdown or collapse of the Atlantic meridional overturning circulation (AMOC) could include modulations to El Niño–Southern Oscillation (ENSO) and development of the Pacific meridional overturning circulation (PMOC). Despite potential ramifications to the global climate, our understanding of the influence of various AMOC and PMOC states on ENSO and global sea surface temperatures (SSTs) remains limited. Five multicentennial, fully coupled model simulations created with the Community Earth System Model were used to explore the influence of AMOC and PMOC on global SSTs and ENSO. We found that the amplitude of annual cycle SSTs across the tropical Pacific decreases and ENSO amplitude increases as a result of an AMOC shutdown, irrespective of PMOC development. However, active deep overturning circulations in both the Atlantic and Pacific basins reduce ENSO amplitude and variance of monthly SSTs globally. Furthermore, the underlying physical reasons for changes to global SSTs and ENSO are also discussed, with the atmospheric and oceanic mechanisms that drive changes to ENSO amplitude differing based on PMOC state. These results suggest that if climate simulations projecting AMOC weakening are realized, compounding climate impacts could occur given the far-reaching ENSO teleconnections to extreme weather and climate events. More broadly, these results provide us with insight into past geologic era climate states, when PMOC was active.},
doi = {10.1175/jcli-d-21-0172.1},
journal = {Journal of Climate},
number = 1,
volume = 35,
place = {United States},
year = {Mon Nov 22 00:00:00 EST 2021},
month = {Mon Nov 22 00:00:00 EST 2021}
}

Works referenced in this record:

ENSO as an Integrating Concept in Earth Science
journal, December 2006


Fundamental Behavior of ENSO Phase Locking
journal, March 2020


Inter-decadal modulation of the impact of ENSO on Australia
journal, May 1999


Hemispheric Asymmetry of the Pacific Shallow Meridional Overturning Circulation
journal, August 2019

  • Zeller, Mathias; McGregor, Shayne; Spence, Paul
  • Journal of Geophysical Research: Oceans, Vol. 124, Issue 8
  • DOI: 10.1029/2018JC014840

The CCSM4 Ocean Component
journal, March 2012

  • Danabasoglu, Gokhan; Bates, Susan C.; Briegleb, Bruce P.
  • Journal of Climate, Vol. 25, Issue 5
  • DOI: 10.1175/JCLI-D-11-00091.1

Phase locking of equatorial Atlantic variability through the seasonal migration of the ITCZ
journal, July 2016


Is the Gulf Stream responsible for Europe's mild winters?
journal, October 2002

  • Seager, R.; Battisti, D. S.; Yin, J.
  • Quarterly Journal of the Royal Meteorological Society, Vol. 128, Issue 586
  • DOI: 10.1256/qj.01.128

Relative Roles of Energy and Momentum Fluxes in the Tropical Response to Extratropical Thermal Forcing
journal, May 2021


Role of the Bering Strait on the hysteresis of the ocean conveyor belt circulation and glacial climate stability
journal, April 2012

  • Hu, A.; Meehl, G. A.; Han, W.
  • Proceedings of the National Academy of Sciences, Vol. 109, Issue 17
  • DOI: 10.1073/pnas.1116014109

Ongoing AMOC and related sea-level and temperature changes after achieving the Paris targets
journal, June 2020


Impacts of Atmospheric Processes on ENSO Asymmetry: A Comparison between CESM1 and CCSM4
journal, December 2017


An Alert Classification System for Monitoring and Assessing the ENSO Cycle
journal, April 2007

  • Kousky, V. E.; Higgins, R. W.
  • Weather and Forecasting, Vol. 22, Issue 2
  • DOI: 10.1175/WAF987.1

Increasing frequency of extreme El Niño events due to greenhouse warming
journal, January 2014

  • Cai, Wenju; Borlace, Simon; Lengaigne, Matthieu
  • Nature Climate Change, Vol. 4, Issue 2
  • DOI: 10.1038/nclimate2100

Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation
journal, March 2015

  • Rahmstorf, Stefan; Box, Jason E.; Feulner, Georg
  • Nature Climate Change, Vol. 5, Issue 5
  • DOI: 10.1038/nclimate2554

An Analysis of the Linkage of Pacific Subtropical Cells with the Recharge–Discharge Processes in ENSO Evolution
journal, May 2015


Is a Decline of AMOC Causing the Warming Hole above the North Atlantic in Observed and Modeled Warming Patterns?
journal, December 2012

  • Drijfhout, Sybren; van Oldenborgh, Geert Jan; Cimatoribus, Andrea
  • Journal of Climate, Vol. 25, Issue 24
  • DOI: 10.1175/JCLI-D-12-00490.1

THERMOHALINE CIRCULATION: High-Latitude Phenomena and the Difference Between the Pacific and Atlantic
journal, May 1999


A Model El Niñ–Southern Oscillation
journal, October 1987


Changes in ITCZ location and cross-equatorial heat transport at the Last Glacial Maximum, Heinrich Stadial 1, and the mid-Holocene
journal, March 2014


Mechanisms of Seasonal – ENSO Interaction
journal, January 1997


Documentation of a highly ENSO‐related sst region in the equatorial pacific: Research note
journal, September 1997


Global and European climate impacts of a slowdown of the AMOC in a high resolution GCM
journal, March 2015


Atlantic meridional heat transports computed from balancing Earth's energy locally
journal, February 2017

  • Trenberth, Kevin E.; Fasullo, John T.
  • Geophysical Research Letters, Vol. 44, Issue 4
  • DOI: 10.1002/2016GL072475

ENSO Asymmetry in CMIP5 Models
journal, June 2014


An Equatorial Ocean Recharge Paradigm for ENSO. Part II: A Stripped-Down Coupled Model
journal, April 1997


The Effect of the South Pacific Convergence Zone on the Termination of El Niño Events and the Meridional Asymmetry of ENSO
journal, August 2012


Inter-decadal change in El Niño-Southern Oscillation examined with Bjerknes stability index analysis
journal, November 2015


The Gulf of Mexico and ENSO Influence on Subseasonal and Seasonal CONUS Winter Tornado Variability
journal, October 2018

  • Molina, Maria J.; Allen, John T.; Gensini, Vittorio A.
  • Journal of Applied Meteorology and Climatology, Vol. 57, Issue 10
  • DOI: 10.1175/JAMC-D-18-0046.1

Understanding Multidecadal Variability in ENSO Amplitude
journal, June 2014


Changes in Tropical Pacific Thermocline Depth and Their Relationship to ENSO after 1999
journal, September 2014


Role of the Bering Strait in the thermohaline circulation and abrupt climate change: BERING STRAIT, THC, AND CLIMATE
journal, March 2007

  • Hu, Aixue; Meehl, Gerald A.; Han, Weiqing
  • Geophysical Research Letters, Vol. 34, Issue 5
  • DOI: 10.1029/2006GL028906

The role of the PMOC in modulating the deglacial shift of the ITCZ
journal, February 2015


Simulated Tropical Response to a Substantial Weakening of the Atlantic Thermohaline Circulation
journal, June 2005

  • Zhang, Rong; Delworth, Thomas L.
  • Journal of Climate, Vol. 18, Issue 12
  • DOI: 10.1175/JCLI3460.1

There is no real evidence for a diminishing trend of the Atlantic meridional overturning circulation
journal, January 2016


Observations of Warm Water Volume Changes in the Equatorial Pacific and Their Relationship to El Niño and La Niña
journal, October 2000


Overturning circulation, nutrient limitation, and warming in the Glacial North Pacific
journal, December 2020


Effect of the potential melting of the Greenland Ice Sheet on the Meridional Overturning Circulation and global climate in the future
journal, September 2011

  • Hu, Aixue; Meehl, Gerald A.; Han, Weiqing
  • Deep Sea Research Part II: Topical Studies in Oceanography, Vol. 58, Issue 17-18
  • DOI: 10.1016/j.dsr2.2010.10.069

Anatomy and Decadal Evolution of the Pacific Subtropical–Tropical Cells (STCs)
journal, September 2005

  • Capotondi, Antonietta; Alexander, Michael A.; Deser, Clara
  • Journal of Climate, Vol. 18, Issue 18
  • DOI: 10.1175/JCLI3496.1

On the connection between AMOC and observed land precipitation in Northern Hemisphere: a comparison of the AMOC indicators
journal, October 2020


Deterministic skill of ENSO predictions from the North American Multimodel Ensemble
journal, March 2017

  • Barnston, Anthony G.; Tippett, Michael K.; Ranganathan, Meghana
  • Climate Dynamics, Vol. 53, Issue 12
  • DOI: 10.1007/s00382-017-3603-3

Observations of long Rossby waves in the northern tropical Pacific
journal, January 1990


El Niño−Southern Oscillation frequency cascade
journal, October 2015

  • Stuecker, Malte F.; Jin, Fei-Fei; Timmermann, Axel
  • Proceedings of the National Academy of Sciences, Vol. 112, Issue 44
  • DOI: 10.1073/pnas.1508622112

Atmosphere–Ocean Variations in the Indo-Pacific Sector during ENSO Episodes
journal, January 2003


Wavelet Transforms and their Applications to Turbulence
journal, January 1992


Atlantic Ocean Forcing of North American and European Summer Climate
journal, July 2005


Stability of the Atlantic Meridional Overturning Circulation: A Review and Synthesis
journal, August 2019

  • Weijer, W.; Cheng, W.; Drijfhout, S. S.
  • Journal of Geophysical Research: Oceans, Vol. 124, Issue 8
  • DOI: 10.1029/2019JC015083

Recent and future sea surface temperature trends in tropical pacific warm pool and cold tongue regions
journal, June 2011


A Stability Analysis of Tropical Ocean–Atmosphere Interactions: Bridging Measurements and Theory for El Niño
journal, July 2001


Frequency- or amplitude-dependent effects of the Atlantic meridional overturning on the tropical Pacific Ocean
journal, January 2009

  • van Oldenborgh, G. J.; te Raa, L. A.; Dijkstra, H. A.
  • Ocean Science, Vol. 5, Issue 3
  • DOI: 10.5194/os-5-293-2009

Improved Estimation of Proxy Sea Surface Temperature in the Arctic
journal, February 2020

  • Banzon, Viva; Smith, Thomas M.; Steele, Michael
  • Journal of Atmospheric and Oceanic Technology, Vol. 37, Issue 2
  • DOI: 10.1175/JTECH-D-19-0177.1

ENSO and Pacific Decadal Variability in the Community Earth System Model Version 2
journal, December 2020

  • Capotondi, A.; Deser, C.; Phillips, A. S.
  • Journal of Advances in Modeling Earth Systems, Vol. 12, Issue 12
  • DOI: 10.1029/2019MS002022

ENSO Seasonal Synchronization Theory
journal, July 2014


Characterizing ENSO Coupled Variability and Its Impact on North American Seasonal Precipitation and Temperature*
journal, May 2015

  • L’Heureux, Michelle L.; Tippett, Michael K.; Barnston, Anthony G.
  • Journal of Climate, Vol. 28, Issue 10
  • DOI: 10.1175/JCLI-D-14-00508.1

Effects of the Bering Strait closure on AMOC and global climate under different background climates
journal, March 2015


Stability of the Atlantic meridional overturning circulation: A model intercomparison
journal, October 2012

  • Weaver, Andrew J.; Sedláček, Jan; Eby, Michael
  • Geophysical Research Letters, Vol. 39, Issue 20
  • DOI: 10.1029/2012GL053763

Atlantic and Pacific tropics connected by mutually interactive decadal-timescale processes
journal, December 2020


Modulation of late Pleistocene ENSO strength by the tropical Pacific thermocline
journal, October 2020

  • Rustic, Gerald T.; Polissar, Pratigya J.; Ravelo, Ana Christina
  • Nature Communications, Vol. 11, Issue 1
  • DOI: 10.1038/s41467-020-19161-6

An Equatorial Ocean Recharge Paradigm for ENSO. Part I: Conceptual Model
journal, April 1997


Impact of Multidecadal Fluctuations in the Atlantic Thermohaline Circulation on Indo-Pacific Climate Variability in a Coupled GCM
journal, July 2010

  • Rashid, Harun A.; Power, Scott B.; Knight, Jeff R.
  • Journal of Climate, Vol. 23, Issue 14
  • DOI: 10.1175/2010JCLI3430.1

Linking ITCZ Migrations to the AMOC and North Atlantic/Pacific SST Decadal Variability
journal, February 2020


Observations, inferences, and mechanisms of the Atlantic Meridional Overturning Circulation: A review
journal, January 2016

  • Buckley, Martha W.; Marshall, John
  • Reviews of Geophysics, Vol. 54, Issue 1
  • DOI: 10.1002/2015RG000493

Pacific Mean-State Control of Atlantic Multidecadal Oscillation–El Niño Relationship
journal, May 2020


Clarifying the Relation between AMOC and Thermal Wind: Application to the Centennial Variability in a Coupled Climate Model
journal, February 2021

  • Waldman, Robin; Hirschi, Joël; Voldoire, Aurore
  • Journal of Physical Oceanography, Vol. 51, Issue 2
  • DOI: 10.1175/JPO-D-19-0284.1

Assessing the role of North Atlantic freshwater forcing in millennial scale climate variability: a tropical Atlantic perspective
journal, February 2005

  • Dahl, Kristina A.; Broccoli, Anthony J.; Stouffer, Ronald J.
  • Climate Dynamics, Vol. 24, Issue 4
  • DOI: 10.1007/s00382-004-0499-5

Memory Matters: A Case for Granger Causality in Climate Variability Studies
journal, March 2018


El Niño–mean state–seasonal cycle interactions in a multi-model ensemble
journal, November 2005


Effect of AMOC collapse on ENSO in a high resolution general circulation model
journal, June 2017

  • Williamson, Mark S.; Collins, Mat; Drijfhout, Sybren S.
  • Climate Dynamics, Vol. 50, Issue 7-8
  • DOI: 10.1007/s00382-017-3756-0

The different relationship of Pacific interior subtropical cells and two types of ENSO
journal, May 2018


Possible shift in the ENSO-Indian monsoon rainfall relationship under future global warming
journal, February 2016

  • Azad, Sarita; Rajeevan, M.
  • Scientific Reports, Vol. 6, Issue 1
  • DOI: 10.1038/srep20145

Is El Niño really changing?: El NIñO DIVERSITY
journal, August 2017

  • Capotondi, Antonietta; Sardeshmukh, Prashant D.
  • Geophysical Research Letters, Vol. 44, Issue 16
  • DOI: 10.1002/2017GL074515

ENSO Suppression due to Weakening of the North Atlantic Thermohaline Circulation*
journal, August 2005

  • Timmermann, A.; An, S-I.; Krebs, U.
  • Journal of Climate, Vol. 18, Issue 16
  • DOI: 10.1175/JCLI3495.1

The Pacific-Atlantic seesaw and the Bering Strait: PACIFIC-ATLANTIC AND BERING STRAIT
journal, February 2012

  • Hu, Aixue; Meehl, Gerald A.; Han, Weiqing
  • Geophysical Research Letters, Vol. 39, Issue 3
  • DOI: 10.1029/2011GL050567

The impact of the AMO on multidecadal ENSO variability: AMO IMPACTS ON ENSO
journal, April 2017

  • Levine, Aaron F. Z.; McPhaden, Michael J.; Frierson, Dargan M. W.
  • Geophysical Research Letters, Vol. 44, Issue 8
  • DOI: 10.1002/2017GL072524

Atlantic-Pacific Asymmetry in Deep Water Formation
journal, May 2018


Observation and modeling of North Atlantic Deep Water Formation and its variability: Introduction
journal, January 1994

  • Stocker, Thomas F.; Broecker, Wallace S.
  • Journal of Geophysical Research, Vol. 99, Issue C6
  • DOI: 10.1029/94JC00956

The Atlantic–Pacific Seesaw
journal, June 2004


Assessing the stability of the Atlantic meridional overturning circulation of the past, present, and future
journal, October 2014


Observation-Based Estimates of Global and Basin Ocean Meridional Heat Transport Time Series
journal, June 2019

  • Trenberth, Kevin E.; Zhang, Yongxin; Fasullo, John T.
  • Journal of Climate, Vol. 32, Issue 14
  • DOI: 10.1175/JCLI-D-18-0872.1

Migrations and dynamics of the intertropical convergence zone
journal, September 2014

  • Schneider, Tapio; Bischoff, Tobias; Haug, Gerald H.
  • Nature, Vol. 513, Issue 7516
  • DOI: 10.1038/nature13636

Understanding ENSO Diversity
journal, June 2015

  • Capotondi, Antonietta; Wittenberg, Andrew T.; Newman, Matthew
  • Bulletin of the American Meteorological Society, Vol. 96, Issue 6
  • DOI: 10.1175/BAMS-D-13-00117.1

A Practical Guide to Wavelet Analysis
journal, January 1998


Active Pacific meridional overturning circulation (PMOC) during the warm Pliocene
journal, September 2017

  • Burls, Natalie J.; Fedorov, Alexey V.; Sigman, Daniel M.
  • Science Advances, Vol. 3, Issue 9
  • DOI: 10.1126/sciadv.1700156

Climate impacts of a weakened Atlantic Meridional Overturning Circulation in a warming climate
journal, June 2020

  • Liu, Wei; Fedorov, Alexey V.; Xie, Shang-Ping
  • Science Advances, Vol. 6, Issue 26
  • DOI: 10.1126/sciadv.aaz4876

The Importance of Wind and Buoyancy Forcing for the Boundary Density Variations and the Geostrophic Component of the AMOC at 26°N
journal, September 2014

  • Polo, Irene; Robson, Jon; Sutton, Rowan
  • Journal of Physical Oceanography, Vol. 44, Issue 9
  • DOI: 10.1175/JPO-D-13-0264.1

Deepwater Formation in the North Pacific During the Last Glacial Termination
journal, July 2010


Weak ENSO asymmetry due to weak nonlinear air–sea interaction in CMIP5 climate models
journal, March 2016


The role of the thermohaline circulation in abrupt climate change
journal, February 2002

  • Clark, Peter U.; Pisias, Nicklas G.; Stocker, Thomas F.
  • Nature, Vol. 415, Issue 6874
  • DOI: 10.1038/415863a

Nonlinear Zonal Wind Response to ENSO in the CMIP5 Models: Roles of the Zonal and Meridional Shift of the ITCZ/SPCZ and the Simulated Climatological Precipitation
journal, November 2015

  • Choi, Kit-Yan; Vecchi, Gabriel A.; Wittenberg, Andrew T.
  • Journal of Climate, Vol. 28, Issue 21
  • DOI: 10.1175/JCLI-D-15-0211.1

Variations in ENSO Phase Locking*
journal, July 2000


Enhancement of ENSO Variability by a Weakened Atlantic Thermohaline Circulation in a Coupled GCM
journal, October 2007

  • Dong, Buwen; Sutton, Rowan T.
  • Journal of Climate, Vol. 20, Issue 19
  • DOI: 10.1175/JCLI4284.1

The production of North Atlantic Deep Water: Sources, rates, and pathways
journal, January 1994

  • Dickson, Robert R.; Brown, Juan
  • Journal of Geophysical Research, Vol. 99, Issue C6
  • DOI: 10.1029/94JC00530

Influence of Bering Strait flow and North Atlantic circulation on glacial sea-level changes
journal, January 2010

  • Hu, Aixue; Meehl, Gerald A.; Otto-Bliesner, Bette L.
  • Nature Geoscience, Vol. 3, Issue 2
  • DOI: 10.1038/ngeo729

A Review of the Role of the Atlantic Meridional Overturning Circulation in Atlantic Multidecadal Variability and Associated Climate Impacts
journal, June 2019

  • Zhang, Rong; Sutton, Rowan; Danabasoglu, Gokhan
  • Reviews of Geophysics, Vol. 57, Issue 2
  • DOI: 10.1029/2019RG000644

The Community Earth System Model: A Framework for Collaborative Research
journal, September 2013

  • Hurrell, James W.; Holland, M. M.; Gent, P. R.
  • Bulletin of the American Meteorological Society, Vol. 94, Issue 9
  • DOI: 10.1175/BAMS-D-12-00121.1

The Influence of a Weakening of the Atlantic Meridional Overturning Circulation on ENSO
journal, October 2007

  • Timmermann, A.; Okumura, Y.; An, S. -I.
  • Journal of Climate, Vol. 20, Issue 19
  • DOI: 10.1175/JCLI4283.1

Freshwater teleconnections and ocean thermohaline circulation: FRESHWATER TELECONNECTIONS
journal, March 2003

  • Seidov, Dan; Haupt, Bernd J.
  • Geophysical Research Letters, Vol. 30, Issue 6
  • DOI: 10.1029/2002GL016564

Revising the Bering Strait freshwater flux into the Arctic Ocean
journal, January 2005


Current Atlantic Meridional Overturning Circulation weakest in last millennium
journal, February 2021