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

Title: On the Correspondence Between Atmosphere-Only and Coupled Simulations for Radiative Feedbacks and Forcing From CO2

Journal Article · · Journal of Geophysical Research: Atmospheres

Atmosphere-only experiments are widely used to investigate climate feedbacks simulated in more computationally expensive fully coupled global climate model simulations. We confirm that this remains a valid approach by comparing the radiative feedbacks and forcing between coupled and atmosphere-only simulations for the latest models taking part in the 6th phase of the Coupled Model Intercomparison Project (CMIP6). For global-mean cloud feedbacks, we find a better than previously known correspondence between these experiments, which applies even to the response of individual cloud properties (amount, altitude, and optical depth) and holds even when considering atmosphere-only simulations of only 1 yr duration. For regional cloud feedbacks, the correspondence between the two experiments is generally present at every geographic location except for the tropical Pacific but takes longer experiments to reveal. For the lapse rate and surface albedo feedbacks, the correspondence between the two experiments is weaker due to the non-uniform warming pattern and loss of sea ice in the coupled experiment. For the across-model relationship between 4xCO2 effective radiative forcing and feedback, we find a different behavior across experiments in CMIP6 than in CMIP5, casting doubt on the physical significance of previous results that highlighted an anti-correlation between the two quantities. Overall, these results confirm the utility of atmosphere-only experiments particularly to study cloud feedbacks, which are the dominant source of inter-model spread in climate sensitivity.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1861237
Report Number(s):
LLNL-JRNL-831122; 1047948
Journal Information:
Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 3 Vol. 127; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

References (80)

High cloud increase in a perturbed SST experiment with a global nonhydrostatic model including explicit convective processes journal July 2014
Global-mean radiative feedbacks and forcing in atmosphere-only and coupled atmosphere-ocean climate change experiments journal June 2014
Cloud feedbacks on greenhouse warming in the superparameterized climate model SP‐CCSM 4 journal December 2014
The relationship between interannual and long-term cloud feedbacks: INTERANNUAL AND LONG-TERM CLOUD FEEDBACKS journal December 2015
Insights from a refined decomposition of cloud feedbacks: REFINED CLOUD FEEDBACK DECOMPOSITION journal September 2016
Recommendations for diagnosing effective radiative forcing from climate models for CMIP6: RECOMMENDED EFFECTIVE RADIATIVE FORCING journal October 2016
Understanding the tropical cloud feedback from an analysis of the circulation and stability regimes simulated from an upgraded multiscale modeling framework: TROPICAL CLOUD FEEDBACK FROM AN MMF journal December 2016
On the pattern of CO 2 radiative forcing and poleward energy transport : CO journal October 2017
Mechanism of tropical low-cloud response to surface warming using weather and climate simulations: LOW-CLOUD RESPONSE TO SURFACE WARMING journal May 2013
Atmospheric component of the MPI-M Earth System Model: ECHAM6: ECHAM6 journal April 2013
Improved simulation of Australian climate and ENSO-related rainfall variability in a global climate model with an interactive aerosol treatment journal January 2009
Indian summer monsoon: Extreme events, historical changes, and role of anthropogenic forcings journal December 2018
The Flexible Global Ocean-Atmosphere-Land system model, Spectral Version 2: FGOALS-s2 journal April 2013
The flexible global ocean-atmosphere-land system model, Grid-point Version 2: FGOALS-g2 journal April 2013
On dynamic and thermodynamic components of cloud changes journal March 2004
On the contribution of local feedback mechanisms to the range of climate sensitivity in two GCM ensembles journal February 2006
A mass-flux cumulus parameterization scheme for large-scale models: description and test with observations journal January 2011
The CNRM-CM5.1 global climate model: description and basic evaluation journal January 2012
Interpretation of the positive low-cloud feedback predicted by a climate model under global warming journal January 2012
A step-response approach for predicting and understanding non-linear precipitation changes journal October 2012
Climate change projections using the IPSL-CM5 Earth System Model: from CMIP3 to CMIP5 journal February 2013
Using aquaplanets to understand the robust responses of comprehensive climate models to forcing journal May 2014
Determining the tropopause height from gridded data: TROPOPAUSE HEIGHT FROM GRIDDED DATA journal October 2003
A new method for diagnosing radiative forcing and climate sensitivity journal January 2004
Fundamental challenge in simulation and prediction of summer monsoon rainfall journal January 2005
A climate sensitivity test using a global cloud resolving model under an aqua planet condition: CLIMATE SENSITIVITY TEST BY A GLOBAL CRM journal October 2005
Marine boundary layer clouds at the heart of tropical cloud feedback uncertainties in climate models journal January 2005
Global mean cloud feedbacks in idealized climate change experiments journal January 2006
Efficacy of climate forcings journal January 2005
Will moist convection be stronger in a warmer climate?: CONVECTION STRENGTH IN A WARMER CLIMATE journal August 2007
Carbon emission limits required to satisfy future representative concentration pathways of greenhouse gases: ALLOWABLE FUTURE CARBON EMISSIONS journal March 2011
Forcing, feedbacks and climate sensitivity in CMIP5 coupled atmosphere-ocean climate models: CLIMATE SENSITIVITY IN CMIP5 MODELS journal May 2012
How may low‐cloud radiative properties simulated in the current climate influence low‐cloud feedbacks under global warming? journal October 2012
Accounting for Changing Temperature Patterns Increases Historical Estimates of Climate Sensitivity journal August 2018
Insensitivity of the Cloud Response to Surface Warming Under Radical Changes to Boundary Layer Turbulence and Cloud Microphysics: Results From the Ultraparameterized CAM journal December 2018
Low‐Cloud Feedback in CAM5‐CLUBB: Physical Mechanisms and Parameter Sensitivity Analysis journal November 2018
High Climate Sensitivity in the Community Earth System Model Version 2 (CESM2) journal July 2019
Causes of Higher Climate Sensitivity in CMIP6 Models journal January 2020
Responses of Clouds and Large‐Scale Circulation to Global Warming Evaluated From Multidecadal Simulations Using a Global Nonhydrostatic Model journal September 2019
An Assessment of Earth's Climate Sensitivity Using Multiple Lines of Evidence journal September 2020
Evaluating Observational Constraints on Intermodel Spread in Cloud, Temperature, and Humidity Feedbacks journal September 2021
Effective Radiative Forcing in a GCM With Fixed Surface Temperatures journal February 2021
Monsoons, ITCZs, and the Concept of the Global Monsoon journal December 2020
Identifying a human signal in the North Atlantic warming hole journal March 2020
An assessment of methods for computing radiative forcing in climate models journal July 2015
The impact of parametrized convection on cloud feedback
  • Webb, Mark J.; Lock, Adrian P.; Bretherton, Christopher S.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 373, Issue 2054 https://doi.org/10.1098/rsta.2014.0414
journal November 2015
The Recent Atlantic Cold Anomaly: Causes, Consequences, and Related Phenomena journal January 2018
Using the Radiative Kernel Technique to Calculate Climate Feedbacks in NCAR’s Community Atmospheric Model journal May 2008
Quantifying Climate Feedbacks Using Radiative Kernels journal July 2008
Improved Climate Simulation by MIROC5: Mean States, Variability, and Climate Sensitivity journal December 2010
The Dynamical Core, Physical Parameterizations, and Basic Simulation Characteristics of the Atmospheric Component AM3 of the GFDL Global Coupled Model CM3 journal July 2011
The Community Climate System Model Version 4 journal October 2011
An Overview of CMIP5 and the Experiment Design journal April 2012
Response of Upper Clouds in Global Warming Experiments Obtained Using a Global Nonhydrostatic Model with Explicit Cloud Processes journal March 2012
The Evolution of Climate Sensitivity and Climate Feedbacks in the Community Atmosphere Model journal March 2012
Computing and Partitioning Cloud Feedbacks Using Cloud Property Histograms. Part I: Cloud Radiative Kernels journal June 2012
GFDL’s ESM2 Global Coupled Climate–Carbon Earth System Models. Part I: Physical Formulation and Baseline Simulation Characteristics journal October 2012
Using Relative Humidity as a State Variable in Climate Feedback Analysis journal April 2012
Is a Decline of AMOC Causing the Warming Hole above the North Atlantic in Observed and Modeled Warming Patterns? journal December 2012
Spatial Decomposition of Climate Feedbacks in the Community Earth System Model journal June 2013
Time-Varying Climate Sensitivity from Regional Feedbacks journal July 2013
The Dependence of Radiative Forcing and Feedback on Evolving Patterns of Surface Temperature Change in Climate Models journal February 2015
Mechanisms of the Negative Shortwave Cloud Feedback in Middle to High Latitudes journal January 2016
Quantifying the Sources of Intermodel Spread in Equilibrium Climate Sensitivity journal January 2016
Lower-Tropospheric Mixing as a Constraint on Cloud Feedback in a Multiparameter Multiphysics Ensemble journal September 2016
Sources of Intermodel Spread in the Lapse Rate and Water Vapor Feedbacks journal April 2018
Intermodel Spread in the Pattern Effect and Its Contribution to Climate Sensitivity in CMIP5 and CMIP6 Models journal September 2020
Present-Day Atmospheric Simulations Using GISS ModelE: Comparison to In Situ, Satellite, and Reanalysis Data journal January 2006
DYAMOND: the DYnamics of the Atmospheric general circulation Modeled On Non-hydrostatic Domains journal September 2019
A New Global Climate Model of the Meteorological Research Institute: MRI-CGCM3 ^|^mdash;Model Description and Basic Performance^|^mdash; journal January 2012
A Unique Feature of the Asian Summer Monsoon Response to Global Warming: The Role of Different Land–Sea Thermal Contrast Change between the Lower and Upper Troposphere journal January 2018
The ACCESS coupled model: description, control climate and evaluation journal March 2013
Effective radiative forcing and adjustments in CMIP6 models journal January 2020
The Cloud Feedback Model Intercomparison Project (CFMIP) contribution to CMIP6 journal January 2017
Development and evaluation of an Earth-System model – HadGEM2 journal January 2011
MIROC-ESM 2010: model description and basic results of CMIP5-20c3m experiments journal January 2011
The Norwegian Earth System Model, NorESM1-M – Part 2: Climate response and scenario projections journal January 2013
Description and basic evaluation of Beijing Normal University Earth System Model (BNU-ESM) version 1 journal January 2014
Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization journal January 2016
The Radiative Forcing Model Intercomparison Project (RFMIP): experimental protocol for CMIP6 journal January 2016

Related Subjects