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

Title: Idealized Simulations of the Tropical Climate and Variability in the Single Column Atmosphere Model (SCAM): Radiative-Convective Equilibrium

Journal Article · · Journal of Advances in Modeling Earth Systems
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]
  1. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA; Physical Sciences Laboratory National Oceanic and Atmospheric Administration Boulder CO USA; NOAA
  2. Rosenstiel School of Marine and Atmospheric Science University of Miami Miami FL USA
  3. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA; Physical Sciences Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
  4. Climate and Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA
  5. School of Marine and Atmospheric Sciences State University of New York at Stony Brook Stony Brook NY USA

To explore the interactions among column processes in the Community Atmosphere Model (CAM), the single-column version of CAM (SCAM) is integrated for 1000 days in radiative-convective equilibrium (RCE) with tropical values of boundary conditions, spanning a parameter or configuration space of model physics versions (v5 vs. v6), vertical resolution (standard and 60 levels), sea surface temperature (SST), and some interpretation-driven experiments. The simulated time-mean climate is reasonable, near observations and RCE of a cyclic cloud-resolving model. Updraft detrainment in the deep convection scheme produces distinctive grid-scale structures in humidity and cloud, which also interact with radiative transfer processes. These grid artifacts average out in multi-column RCE results reported elsewhere, illustrating the nuts-and-bolts interpretability that SCAM adds to the hierarchy of model configurations. Multi-day oscillations of precipitation arise from descent of warm convection-capping layers starting near the tropopause, eventually reset by a burst of convective deepening. Experiments reveal how these oscillations depend critically on an internal parameter that controls the number of neutral buoyancy levels allowed for determining cloud top and computing dilute convective available potential energy in the deep convection scheme, and merely modified a little by disabling cloud-base radiation (heating of cloud base). This strong dependence of transient behavior in 1D on this parameter will be tested in the second part of this work, in which SCAM is coupled to a parameterized dynamics of two-dimensional, linearized gravity wave, and in the 3D simulations in future study.

Research Organization:
Univ. of Miami, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0006806
OSTI ID:
1978561
Journal Information:
Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Journal Issue: 2 Vol. 14; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

References (75)

Reference aquaplanet climate in the C ommunity A tmosphere M odel, V ersion 5 journal January 2016
Energy considerations in the Community Atmosphere Model (CAM): ENERGY CONSIDERATIONS IN CAM journal July 2015
Select strengths and biases of models in representing the Arctic winter boundary layer over sea ice: the Larcform 1 single column model intercomparison: FIRST ARCTIC AIR MASS INTERCOMPARISON journal August 2016
Vertical Resolution Refinement in an Aqua-Planet and Its Effect on the ITCZ journal October 2017
A perspective on climate model hierarchies: MODEL HIERARCHIES journal August 2017
Influence of entrainment on the thermal stratification in simulations of radiative-convective equilibrium: ENTRAINMENT AND THERMAL STRATIFICATION journal August 2013
The effect of time steps and time-scales on parametrization suites journal August 2012
The ERA5 global reanalysis journal June 2020
On resolution sensitivity in the Community Atmosphere Model journal July 2020
Time-scales of adjustment to radiative-convective equilibrium in the tropical atmosphere journal October 1998
A standard test for AGCMs including their physical parametrizations: I: The proposal journal July 2000
Towards constraining climate sensitivity by linear analysis of feedback patterns in thousands of perturbed-physics GCM simulations journal July 2007
Organization of tropical convection in a GCM with varying vertical resolution; implications for the simulation of the Madden-Julian Oscillation journal July 2001
Impact of increased vertical resolution on simulation of tropical climate journal March 2006
The role of equatorial waves in the onset of the South China Sea summer monsoon and the demise of El Niño during 1998 journal December 2006
An important constraint on tropical cloud - climate feedback: TROPICAL CLOUD-CLIMATE FEEDBACK journal October 2002
Radiative forcing by long-lived greenhouse gases: Calculations with the AER radiative transfer models journal January 2008
Convectively coupled equatorial waves journal January 2009
Tropical tropopause layer journal January 2009
Global simulations of ice nucleation and ice supersaturation with an improved cloud scheme in the Community Atmosphere Model journal January 2010
Idealized tropical cyclone simulations of intermediate complexity: A test case for AGCMs journal February 2012
Radiative Convective Equilibrium and Organized Convection: An Observational Perspective journal May 2019
Understanding Cloud and Convective Characteristics in Version 1 of the E3SM Atmosphere Model journal October 2018
The Single Column Atmosphere Model Version 6 (SCAM6): Not a Scam but a Tool for Model Evaluation and Development journal May 2019
Model Hierarchies for Understanding Atmospheric Circulation journal May 2019
Predictability of Weather and Climate journal July 2019
High Climate Sensitivity in the Community Earth System Model Version 2 (CESM2) journal July 2019
Four Theories of the Madden‐Julian Oscillation journal July 2020
Clouds and Convective Self‐Aggregation in a Multimodel Ensemble of Radiative‐Convective Equilibrium Simulations journal September 2020
Using Radiative Convective Equilibrium to Explore Clouds and Climate in the Community Atmosphere Model journal December 2021
A methodology for understanding and intercomparing atmospheric climate feedback processes in general circulation models journal January 1988
Spread in model climate sensitivity traced to atmospheric convective mixing journal January 2014
Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadian climate centre general circulation model journal September 1995
The Dependence on Convection Parameterization of the Tropical Intraseasonal Oscillation Simulated by the UIUC 11-Layer Atmospheric GCM journal May 1999
Modeling Tropical Precipitation in a Single Column journal December 2000
Estimates of Meridional Atmosphere and Ocean Heat Transports journal August 2001
Understanding Differences between the Equatorial Pacific as Simulated by Two Coupled GCMs journal March 2002
On the Power Spectrum of “Red Noise” journal March 1963
Thermal Equilibrium of the Atmosphere with a Convective Adjustment journal July 1964
Detection of a 40–50 Day Oscillation in the Zonal Wind in the Tropical Pacific journal July 1971
Determination of Bulk Properties of Tropical Cloud Clusters from Large-Scale Heat and Moisture Budgets journal May 1973
Low-Frequency Oscillations in Radiative-Convective Systems journal April 1994
Small-Scale and Mesoscale Variability in Cloudy Boundary Layers: Joint Probability Density Functions journal December 2002
A PDF-Based Model for Boundary Layer Clouds. Part I: Method and Model Description journal December 2002
Cloud Resolving Modeling of the ARM Summer 1997 IOP: Model Formulation, Results, Uncertainties, and Sensitivities journal February 2003
AMIP: The Atmospheric Model Intercomparison Project journal December 1992
Observations of the 40–50-Day Tropical Oscillation—A Review journal May 1994
Numerical Instability Resulting from Infrequent Calculation of Radiative Heating journal March 2004
Modeling the Interaction between Cumulus Convection and Linear Gravity Waves Using a Limited-Domain Cloud System–Resolving Model journal February 2008
Effects of Convective Momentum Transport on the Atmospheric Circulation in the Community Atmosphere Model, Version 3 journal April 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
The Tropical Warm Pool International Cloud Experiment journal May 2008
An Overview of CMIP5 and the Experiment Design journal April 2012
Advanced Two-Moment Bulk Microphysics for Global Models. Part I: Off-Line Tests and Comparison with Other Schemes journal February 2015
Improving the Simulation of Tropical Convective Cloud-Top Heights in CAM5 with CloudSat Observations journal July 2018
Simulation of the Madden–Julian Oscillation in the NCAR CCM3 Using a Revised Zhang–McFarlane Convection Parameterization Scheme journal October 2005
Precipitation Characteristics in Eighteen Coupled Climate Models journal September 2006
The Global Distribution of Supersaturation in the Upper Troposphere from the Atmospheric Infrared Sounder journal December 2006
An Analysis of the Warm-Season Diurnal Cycle over the Continental United States and Northern Mexico in General Circulation Models journal June 2007
The Gap between Simulation and Understanding in Climate Modeling journal November 2005
A Conceptual Spectral Plume Model for Understanding Tropical Temperature Profile and Convective Updraft Velocities journal August 2019
Integrating Cloud Processes in the Community Atmosphere Model, Version 5 journal September 2014
An Analytical Model for Tropical Relative Humidity journal October 2014
Physics–Dynamics Coupling in Weather, Climate, and Earth System Models: Challenges and Recent Progress journal November 2018
Dependence of APE Simulations on Vertical Resolution with the Community Atmospheric Model, Version 3 journal January 2013
Different contact angle distributions for heterogeneous ice nucleation in the Community Atmospheric Model version 5 journal January 2014
Putting the clouds back in aerosol–cloud interactions journal January 2015
Effects of pre-existing ice crystals on cirrus clouds and comparison between different ice nucleation parameterizations with the Community Atmosphere Model (CAM5) journal January 2015
Effects of thermodynamics, dynamics and aerosols on cirrus clouds based on in situ observations and NCAR CAM6 journal January 2021
The path to CAM6: coupled simulations with CAM5.4 and CAM5.5 journal January 2018
Radiative–convective equilibrium model intercomparison project journal January 2018
Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization journal January 2016