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Title: Will There Be a Significant Change to El Niño in the Twenty-First Century?

Journal Article · · Journal of Climate
 [1];  [1];  [2];  [2];  [2];  [2]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)

The El Niño–Southern Oscillation (ENSO) response to anthropogenic climate change is assessed in the following 1° nominal resolution Community Climate System Model, version 4 (CCSM4) Coupled Model Intercomparison Project phase 5 (CMIP5) simulations: twentieth-century ensemble, preindustrial control, twenty-first-century projections, and stabilized 2100–2300 “extension runs.” ENSO variability weakens slightly with CO2; however, various significance tests reveal that changes are insignificant at all but the highest CO2levels. Comparison with the 1850 control simulation suggests that ENSO changes may become significant on centennial time scales; the lack of signal in the twentieth- versus twenty-first-century ensembles is due to their limited duration. Changes to the mean state are consistent with previous studies: a weakening of the subtropical wind stress curl, an eastward shift of the tropical convective cells, a reduction in the zonal SST gradient, and an increase in vertical thermal stratification take place as CO2increases. The extratropical thermocline deepens throughout the twenty-first century, with the tropical thermocline changing slowly in response. The adjustment time scale is set by the relevant ocean dynamics, and the delay in its effect on ENSO variability is not diminished by increasing ensemble size. The CCSM4 results imply that twenty-first-century simulations may simply be too short for identification of significant tropical variability response to climate change. An examination of atmospheric teleconnections, in contrast, shows that the remote influences of ENSO do respond rapidly to climate change in some regions, particularly during boreal winter. Finally, this suggests that changes to ENSO impacts may take place well before changes to oceanic tropical variability itself become significant.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; FC02-97ER62402
OSTI ID:
1564913
Journal Information:
Journal of Climate, Vol. 25, Issue 6; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 123 works
Citation information provided by
Web of Science

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Forced changes to twentieth century ENSO diversity in a last Millennium context journal March 2017
Coral Sr‐U thermometry journal June 2016
El Niño modulations over the past seven centuries journal July 2013
Simulated future changes in ENSO dynamics in the framework of the linear recharge oscillator model journal April 2019
Interdecadal change of interannual variability and predictability of two types of ENSO journal April 2014
Increased variability of eastern Pacific El Niño under greenhouse warming journal December 2018
Highly Variable El Niño–Southern Oscillation Throughout the Holocene journal January 2013
Assessment of the CMIP5 global climate model simulations of the western tropical Pacific climate system and comparison to CMIP3: ASSESSMENT OF CMIP5 CLIMATE MODELS FOR THE WESTERN TROPICAL PACIFIC journal February 2014
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