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Title: Sea-surface temperature pattern effects have slowed global warming and biased warming-based constraints on climate sensitivity

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6]; ORCiD logo [7];  [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [11];  [12];  [13]
  1. Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, School of Oceanography, University of Washington, Seattle, WA 98195
  2. Department of Climate, Meteorology, and Atmospheric Sciences, University of Illinois, Urbana-Champaign, Champaign, IL 61801, Department of Earth Sciences and Environmental Change, University of Illinois, Urbana-Champaign, Champaign, IL 61801
  3. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
  4. Scripps Institution of Oceanography, La Jolla, CA 92093
  5. Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195
  6. Department of Physics, University of Otago, Dunedin, NZ 9016
  7. Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, CH 8092
  8. Met Office Hadley Centre, Exeter EX1 3PB, United Kingdom
  9. Department of Oceanography and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawai’i at Mānoa, Honolulu, HI 96822
  10. Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, Livermore, CA 94550
  11. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027
  12. Priestley International Centre for Climate, University of Leeds, Leeds LS2 9JT, United Kingdom
  13. Met Office Hadley Centre, Exeter EX1 3PB, United Kingdom, National Centre for Atmospheric Science, University of Reading, Reading RG6 6ET, United Kingdom

The observed rate of global warming since the 1970s has been proposed as a strong constraint on equilibrium climate sensitivity (ECS) and transient climate response (TCR)—key metrics of the global climate response to greenhouse-gas forcing. Using CMIP5/6 models, we show that the inter-model relationship between warming and these climate sensitivity metrics (the basis for the constraint) arises from a similarity in transient and equilibrium warming patterns within the models, producing an effective climate sensitivity (EffCS) governing recent warming that is comparable to the value of ECS governing long-term warming under CO 2 forcing. However, CMIP5/6 historical simulations do not reproduce observed warming patterns. When driven by observed patterns, even high ECS models produce low EffCS values consistent with the observed global warming rate. The inability of CMIP5/6 models to reproduce observed warming patterns thus results in a bias in the modeled relationship between recent global warming and climate sensitivity. Correcting for this bias means that observed warming is consistent with wide ranges of ECS and TCR extending to higher values than previously recognized. These findings are corroborated by energy balance model simulations and coupled model (CESM1-CAM5) simulations that better replicate observed patterns via tropospheric wind nudging or Antarctic meltwater fluxes. Because CMIP5/6 models fail to simulate observed warming patterns, proposed warming-based constraints on ECS, TCR, and projected global warming are biased low. The results reinforce recent findings that the unique pattern of observed warming has slowed global-mean warming over recent decades and that how the pattern will evolve in the future represents a major source of uncertainty in climate projections.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0022110
OSTI ID:
2322602
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 121 Journal Issue: 12; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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