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

Title: Using Radiative Convective Equilibrium to Explore Clouds and Climate in the Community Atmosphere Model

Journal Article · · Journal of Advances in Modeling Earth Systems

Abstract Characteristics of, and fundamental differences between, the radiative‐convective equilibrium (RCE) climate states following the Radiative‐Convective Equilibrium Model Intercomparison Project (RCEMIP) protocols in the Community Atmosphere Model version 5 (CAM5) and version 6 (CAM6) are presented. This paper explores the characteristics of clouds, moisture, precipitation and circulation in the RCE state, as well as the tropical response to surface warming, in CAM5 and CAM6 with different parameterizations. Overall, CAM5 simulates higher precipitation rates that result in larger global average precipitation, despite lower outgoing longwave radiation compared to CAM6. Differences in the structure of clouds, particularly the amount and vertical location of cloud liquid, exist between the CAM versions and can, in part, be related to distinct representations of shallow convection and boundary layer processes. Both CAM5 and CAM6 simulate similar peaks in cloud fraction, relative humidity, and cloud ice, linked to the usage of a similar deep convection parameterization. These anvil clouds rise and decrease in extent in response to surface warming. More generally, extreme precipitation, aggregation of convection, and climate sensitivity increase with warming in both CAM5 and CAM6. This analysis provides a benchmark for future studies that explore clouds, convection, and climate in CAM with the RCEMIP protocols now available in the Community Earth System Model. These results are discussed within the context of realistic climate simulations using CAM5 and CAM6, highlighting the usefulness of a hierarchical modeling approach to understanding model and parameterization sensitivities to inform model development efforts.

Sponsoring Organization:
USDOE
OSTI ID:
1834224
Journal Information:
Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Journal Issue: 12 Vol. 13; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

References (84)

Physical mechanisms controlling self-aggregation of convection in idealized numerical modeling simulations: SELF-AGGREGATION MECHANISMS journal February 2014
Parametric behaviors of CLUBB in simulations of low clouds in the Community Atmosphere Model (CAM): PARAMETRIC BEHAVIORS OF CLUBB IN CAM journal July 2015
Impact of the dynamical core on the direct simulation of tropical cyclones in a high-resolution global model: DYNAMICAL CORE IMPACT ON TC ACTIVITY journal May 2015
What favors convective aggregation and why?: WHAT FAVORS CONVECTIVE AGGREGATION journal July 2015
Global-scale convective aggregation: Implications for the Madden-Julian Oscillation: GLOBAL-SCALE CONVECTIVE AGGREGATION journal October 2015
Physical mechanisms controlling the initiation of convective self-aggregation in a General Circulation Model: MECHANISMS OF INITIATION OF AGGREGATION journal December 2015
The link between extreme precipitation and convective organization in a warming climate: Global radiative-convective equilibrium simulations: EXTREME PRECIPITATION AND CONVECTIVE ORG journal November 2016
Radiative convective equilibrium as a framework for studying the interaction between convection and its large-scale environment: RCE, CONVECTION, AND DOMAIN SIZE journal August 2016
Coupled radiative convective equilibrium simulations with explicit and parameterized convection: COUPLED RCE SIMULATIONS journal September 2016
Inter‐model comparison of subseasonal tropical variability in aquaplanet experiments: Effect of a warm pool journal October 2016
The tropical rain belts with an annual cycle and a continent model intercomparison project: TRACMIP journal December 2016
Organization of tropical convection in low vertical wind shears: Role of updraft entrainment journal May 2017
Imprint of the convective parameterization and sea‐surface temperature on large‐scale convective self‐aggregation journal May 2017
An Idealized Test of the Response of the Community Atmosphere Model to Near‐Grid‐Scale Forcing Across Hydrostatic Resolutions journal February 2018
Clouds, Circulation, and Climate Sensitivity in a Radiative-Convective Equilibrium Channel Model: CLOUDS AND CLIMATE FEEDBACKS IN RCE journal December 2017
Increases in moist-convective updraught velocities with warming in radiative-convective equilibrium: Increases in Updraught Velocities with Warming journal June 2015
Analytical initial conditions and an analysis of baroclinic instability waves in f - and β -plane 3D channel models : Baroclinic Instability Waves in 3D Channel Models journal July 2015
Radiative–convective equilibrium in a three-dimensional cloud-ensemble model journal July 1998
A standard test for AGCMs including their physical parametrizations: I: The proposal journal July 2000
Tropical precipitation regimes and mechanisms of regime transitions: contrasting two aquaplanet general circulation models journal April 2012
Using aquaplanets to understand the robust responses of comprehensive climate models to forcing journal May 2014
Convective Self-Aggregation in Numerical Simulations: A Review journal February 2017
Aquaplanet Simulations of Tropical Cyclones journal June 2019
Radiative forcing by long-lived greenhouse gases: Calculations with the AER radiative transfer models journal January 2008
Idealized tropical cyclone simulations of intermediate complexity: A test case for AGCMs journal February 2012
Climate and climate change in a radiative-convective equilibrium version of ECHAM6: RCE WITH ECHAM6 journal January 2013
NCAR Release of CAM‐SE in CESM2.0: A Reformulation of the Spectral Element Dynamical Core in Dry‐Mass Vertical Coordinates With Comprehensive Treatment of Condensates and Energy journal July 2018
Parametric Sensitivity and Uncertainty Quantification in the Version 1 of E3SM Atmosphere Model Based on Short Perturbed Parameter Ensemble Simulations journal December 2018
Understanding Cloud and Convective Characteristics in Version 1 of the E3SM Atmosphere Model journal October 2018
Roles of Cloud Microphysics on Cloud Responses to Sea Surface Temperatures in Radiative-Convective Equilibrium Experiments Using a High-Resolution Global Nonhydrostatic Model journal August 2018
Low‐Cloud Feedback in CAM5‐CLUBB: Physical Mechanisms and Parameter Sensitivity Analysis journal November 2018
The Single Column Atmosphere Model Version 6 (SCAM6): Not a Scam but a Tool for Model Evaluation and Development journal May 2019
High Climate Sensitivity in the Community Earth System Model Version 2 (CESM2) journal July 2019
Sensitivity of Convective Self‐Aggregation to Domain Size journal July 2019
The Community Earth System Model Version 2 (CESM2) journal February 2020
An Evaluation of the Large‐Scale Atmospheric Circulation and Its Variability in CESM2 and Other CMIP Models journal June 2020
CO 2 Increase Experiments Using the CESM: Relationship to Climate Sensitivity and Comparison of CESM1 to CESM2 journal November 2020
Clouds and Convective Self‐Aggregation in a Multimodel Ensemble of Radiative‐Convective Equilibrium Simulations journal September 2020
Understanding the Extreme Spread in Climate Sensitivity within the Radiative‐Convective Equilibrium Model Intercomparison Project journal October 2020
Clouds and Radiation in a Mock‐Walker Circulation journal February 2021
New estimates of radiative forcing due to well mixed greenhouse gases journal July 1998
A methodology for understanding and intercomparing atmospheric climate feedback processes in general circulation models journal January 1988
Thermodynamic control of anvil cloud amount journal July 2016
Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadian climate centre general circulation model journal September 1995
What Are Climate Models Missing? journal May 2013
Thermal Equilibrium of the Atmosphere with a Convective Adjustment journal July 1964
Coupling of the Radiative, Convective, and Surface Fluxes over the Equatorial Pacific journal February 1988
Radiative-Convective Equilibrium with Explicit Two-Dimensional Moist Convection journal December 1993
A PDF-Based Model for Boundary Layer Clouds. Part I: Method and Model Description journal December 2002
A Proposal for the Intercomparison of the Dynamical Cores of Atmospheric General Circulation Models journal October 1994
Effects of Convective Momentum Transport on the Atmospheric Circulation in the Community Atmosphere Model, Version 3 journal April 2008
Aquaplanets, Climate Sensitivity, and Low Clouds journal October 2008
A New Two-Moment Bulk Stratiform Cloud Microphysics Scheme in the Community Atmosphere Model, Version 3 (CAM3). Part I: Description and Numerical Tests journal August 2008
The Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events journal November 2008
A New Moist Turbulence Parameterization in the Community Atmosphere Model journal June 2009
The University of Washington Shallow Convection and Moist Turbulence Schemes and Their Impact on Climate Simulations with the Community Atmosphere Model journal June 2009
An Analytic Vortex Initialization Technique for Idealized Tropical Cyclone Studies in AGCMs journal February 2011
The Gap between Simulation and Understanding in Climate Modeling journal November 2005
Detailed Investigation of the Self-Aggregation of Convection in Cloud-Resolving Simulations journal August 2012
Global Radiative–Convective Equilibrium in the Community Atmosphere Model, Version 5 journal May 2015
Role of Radiative–Convective Feedbacks in Spontaneous Tropical Cyclogenesis in Idealized Numerical Simulations journal July 2016
Dynamical Aquaplanet Experiments with Uniform Thermal Forcing: System Dynamics and Implications for Tropical Cyclone Genesis and Size journal July 2019
An Energy-Balance Analysis of Deep Convective Self-Aggregation above Uniform SST journal December 2005
A Gray-Radiation Aquaplanet Moist GCM. Part I: Static Stability and Eddy Scale journal October 2006
Dynamic Radiative–Convective Equilibria Using GCM Column Physics journal January 2007
Observed Scaling in Clouds and Precipitation and Scale Incognizance in Regional to Global Atmospheric Models journal December 2013
Higher-Order Turbulence Closure and Its Impact on Climate Simulations in the Community Atmosphere Model journal December 2013
Integrating Cloud Processes in the Community Atmosphere Model, Version 5 journal September 2014
Advanced Two-Moment Bulk Microphysics for Global Models. Part I: Off-Line Tests and Comparison with Other Schemes journal February 2015
An Explanation for the Sensitivity of the Mean State of the Community Atmosphere Model to Horizontal Resolution on Aquaplanets journal July 2017
An Evaluation of Marine Boundary Layer Cloud Property Simulations in the Community Atmosphere Model Using Satellite Observations: Conventional Subgrid Parameterization versus CLUBB journal March 2018
Robust Responses of the Hydrological Cycle to Global Warming journal November 2006
An Overview of CMIP5 and the Experiment Design journal April 2012
The Evolution of Climate Sensitivity and Climate Feedbacks in the Community Atmosphere Model journal March 2012
The Atmospheric Energy Constraint on Global-Mean Precipitation Change journal January 2014
An Analytical Model for Tropical Relative Humidity journal October 2014
Dependence of aqua-planet simulations on time step journal April 2003
A baroclinic instability test case for atmospheric model dynamical cores journal October 2006
The Aqua-Planet Experiment (APE): CONTROL SST Simulation journal January 2013
DCMIP2016: a review of non-hydrostatic dynamical core design and intercomparison of participating models journal January 2017
Radiative–convective equilibrium model intercomparison project journal January 2018
DCMIP2016: the splitting supercell test case journal January 2019
A moist aquaplanet variant of the Held–Suarez test for atmospheric model dynamical cores journal January 2016
Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization journal January 2016