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Title: The Community Earth System Model version 2 (CESM2)

Abstract

An overview of the Community Earth System Model version 2 (CESM2) is provided, including a discussion of the challenges encountered during its development and how they were addressed. In addition, an evaluation of a pair of CESM2 long pre-industrial control and historical ensemble simulations is presented. These simulations were performed using the nominal 1° horizontal resolution configuration of the coupled model with both the “low-top” (40 km, with limited chemistry) and “high-top” (140 km, with comprehensive chemistry) versions of the atmospheric component. CESM2 contains many substantial science and infrastructure improvements and new capabilities since its previous major release, CESM1, resulting in improved historical simulations in comparison to CESM1 and available observations. These include major reductions in low latitude precipitation and short-wave cloud forcing biases; better representation of the Madden-Julian Oscillation; better El Niño – Southern Oscillation-related teleconnections; and a global land carbon accumulation trend that agrees well with observationally-based estimates. Most tropospheric and surface features of the low- and high-top simulations are very similar to each other, so these improvements are present in both configurations. CESM2 has an equilibrium climate sensitivity of 5.1-5.3°C, larger than in CESM1, primarily due to a combination of relatively small changes to cloud microphysics andmore » boundary layer parameters. In contrast, CESM2’s transient climate response of 1.9-2.0°C is comparable to that of CESM1. The model outputs from these and many other simulations are available to the research community, and theyrepresent CESM2’s contributions to the Coupled Model Intercomparison Project phase 6 (CMIP6).« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7];  [8];  [4];  [4];  [1];  [4];  [4];  [1];  [9];  [4];  [10];  [7];  [11] more »;  [7];  [4];  [4];  [11];  [8];  [12];  [1];  [4];  [4];  [11];  [13];  [14];  [15];  [16];  [17];  [18];  [4];  [4];  [19];  [4];  [20];  [21];  [4] « less
  1. National Center for Atmospheric Research, Boulder, Colorado
  2. NOAA Earth System Research/Cooperative Inst. For Research in Environmental Sciences, Univ. of CO.
  3. University Corporation for Atmospheric Research Boulder CO 80307 (United States)
  4. National Center for Atmospheric Research
  5. National Center for Atmospheric Research (NCAR)
  6. National Center for Atmospheric Research, Boulder, CO
  7. University Corporation for Atmospheric Research
  8. National Center for Atmospheric Research, PO Box 3000-80307,
  9. Utrecht University
  10. Los Alamos National Laboratory
  11. NCAR
  12. Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, The Ne
  13. University of California, Berkeley
  14. Brown University
  15. University of Colorado at Boulder
  16. Atmospheric Chemistry Division, National Center of Atmospheric
  17. University of Toronto
  18. University of Wisconsin-Milwaukee
  19. University of California, Irvine
  20. Columbia University
  21. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1606015
Report Number(s):
PNNL-SA-151018
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Volume: 12; Journal Issue: 2
Country of Publication:
United States
Language:
English

Citation Formats

Danabasoglu, Gokhan, Lamarque, Jean-Francois, Bacmeister, Julio T., Bailey, David, DuVivier, A K., Edwards, Jim, Emmons, L., Fasullo, John, Garcia, Rolando R., Gettelman, Andrew, Hannay, Cecile, Holland, Marika M., Large, William G., Lauritzen, P. H., Lawrence, David M., Lenaerts, Jan, Lindsay, Keith, Lipscomb, William, Mills, Mike, Neale, Richard, Oleson, Keith, Otto-Bliesner, B, Phillips, Adam S., Sacks, William J., Tilmes, S, Van Kampenhout, Leo, Vertenstein, Mariana, Bertini, A, Dennis, J, Deser, C, Fischer, Curt R., Fox-Kemper, B, Kay, J E., Kinnison, Douglas E., Kushner, P., Larson, Vince, Long, Matthew, Mickelson, Sheri, Moore, J K., Nienhouse, E, Polvani, Lorenzo M., Rasch, Philip J., and Strand, W G. The Community Earth System Model version 2 (CESM2). United States: N. p., 2020. Web. doi:10.1029/2019MS001916.
Danabasoglu, Gokhan, Lamarque, Jean-Francois, Bacmeister, Julio T., Bailey, David, DuVivier, A K., Edwards, Jim, Emmons, L., Fasullo, John, Garcia, Rolando R., Gettelman, Andrew, Hannay, Cecile, Holland, Marika M., Large, William G., Lauritzen, P. H., Lawrence, David M., Lenaerts, Jan, Lindsay, Keith, Lipscomb, William, Mills, Mike, Neale, Richard, Oleson, Keith, Otto-Bliesner, B, Phillips, Adam S., Sacks, William J., Tilmes, S, Van Kampenhout, Leo, Vertenstein, Mariana, Bertini, A, Dennis, J, Deser, C, Fischer, Curt R., Fox-Kemper, B, Kay, J E., Kinnison, Douglas E., Kushner, P., Larson, Vince, Long, Matthew, Mickelson, Sheri, Moore, J K., Nienhouse, E, Polvani, Lorenzo M., Rasch, Philip J., & Strand, W G. The Community Earth System Model version 2 (CESM2). United States. doi:10.1029/2019MS001916.
Danabasoglu, Gokhan, Lamarque, Jean-Francois, Bacmeister, Julio T., Bailey, David, DuVivier, A K., Edwards, Jim, Emmons, L., Fasullo, John, Garcia, Rolando R., Gettelman, Andrew, Hannay, Cecile, Holland, Marika M., Large, William G., Lauritzen, P. H., Lawrence, David M., Lenaerts, Jan, Lindsay, Keith, Lipscomb, William, Mills, Mike, Neale, Richard, Oleson, Keith, Otto-Bliesner, B, Phillips, Adam S., Sacks, William J., Tilmes, S, Van Kampenhout, Leo, Vertenstein, Mariana, Bertini, A, Dennis, J, Deser, C, Fischer, Curt R., Fox-Kemper, B, Kay, J E., Kinnison, Douglas E., Kushner, P., Larson, Vince, Long, Matthew, Mickelson, Sheri, Moore, J K., Nienhouse, E, Polvani, Lorenzo M., Rasch, Philip J., and Strand, W G. Mon . "The Community Earth System Model version 2 (CESM2)". United States. doi:10.1029/2019MS001916.
@article{osti_1606015,
title = {The Community Earth System Model version 2 (CESM2)},
author = {Danabasoglu, Gokhan and Lamarque, Jean-Francois and Bacmeister, Julio T. and Bailey, David and DuVivier, A K. and Edwards, Jim and Emmons, L. and Fasullo, John and Garcia, Rolando R. and Gettelman, Andrew and Hannay, Cecile and Holland, Marika M. and Large, William G. and Lauritzen, P. H. and Lawrence, David M. and Lenaerts, Jan and Lindsay, Keith and Lipscomb, William and Mills, Mike and Neale, Richard and Oleson, Keith and Otto-Bliesner, B and Phillips, Adam S. and Sacks, William J. and Tilmes, S and Van Kampenhout, Leo and Vertenstein, Mariana and Bertini, A and Dennis, J and Deser, C and Fischer, Curt R. and Fox-Kemper, B and Kay, J E. and Kinnison, Douglas E. and Kushner, P. and Larson, Vince and Long, Matthew and Mickelson, Sheri and Moore, J K. and Nienhouse, E and Polvani, Lorenzo M. and Rasch, Philip J. and Strand, W G.},
abstractNote = {An overview of the Community Earth System Model version 2 (CESM2) is provided, including a discussion of the challenges encountered during its development and how they were addressed. In addition, an evaluation of a pair of CESM2 long pre-industrial control and historical ensemble simulations is presented. These simulations were performed using the nominal 1° horizontal resolution configuration of the coupled model with both the “low-top” (40 km, with limited chemistry) and “high-top” (140 km, with comprehensive chemistry) versions of the atmospheric component. CESM2 contains many substantial science and infrastructure improvements and new capabilities since its previous major release, CESM1, resulting in improved historical simulations in comparison to CESM1 and available observations. These include major reductions in low latitude precipitation and short-wave cloud forcing biases; better representation of the Madden-Julian Oscillation; better El Niño – Southern Oscillation-related teleconnections; and a global land carbon accumulation trend that agrees well with observationally-based estimates. Most tropospheric and surface features of the low- and high-top simulations are very similar to each other, so these improvements are present in both configurations. CESM2 has an equilibrium climate sensitivity of 5.1-5.3°C, larger than in CESM1, primarily due to a combination of relatively small changes to cloud microphysics and boundary layer parameters. In contrast, CESM2’s transient climate response of 1.9-2.0°C is comparable to that of CESM1. The model outputs from these and many other simulations are available to the research community, and theyrepresent CESM2’s contributions to the Coupled Model Intercomparison Project phase 6 (CMIP6).},
doi = {10.1029/2019MS001916},
journal = {Journal of Advances in Modeling Earth Systems},
number = 2,
volume = 12,
place = {United States},
year = {2020},
month = {2}
}

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A 350-year atmospheric history for carbonyl sulfide inferred from Antarctic firn air and air trapped in ice: AN ATMOSPHERE HISTORY FOR COS
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Upper ocean ecosystem dynamics and iron cycling in a global three-dimensional model: GLOBAL ECOSYSTEM-BIOGEOCHEMICAL MODEL
journal, December 2004

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The Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events
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Modelling the climate and surface mass balance of polar ice sheets using RACMO2 – Part 1: Greenland (1958–2016)
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Parameterization and Surface Data Improvements and New Capabilities for the Community Land Model Urban (CLMU)
journal, February 2020

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The Scenario Model Intercomparison Project (ScenarioMIP) for CMIP6
journal, January 2016

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Climate Variability and Change since 850 CE: An Ensemble Approach with the Community Earth System Model
journal, May 2016

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Global oceanic emission of ammonia: Constraints from seawater and atmospheric observations
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ERA-20C: An Atmospheric Reanalysis of the Twentieth Century
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Sea state dependence of the wind stress over the ocean under hurricane winds: Sea State Dependence of the Wind Stress
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A Parameterization with a Constrained Potential Energy Conversion Rate of Vertical Mixing Due to Langmuir Turbulence
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Effects of Convective Momentum Transport on the Atmospheric Circulation in the Community Atmosphere Model, Version 3
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MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications
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An Emergent Sea Ice Floe Size Distribution in a Global Coupled Ocean‐Sea Ice Model
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Berkeley Earth Temperature Averaging Process
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Volcanic Radiative Forcing From 1979 to 2015
journal, November 2018

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Uncertainty in modeled Arctic sea ice volume
journal, January 2011

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The parametrization of drag induced by stratified flow over anisotropic orography
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Global atmospheric sulfur budget under volcanically quiescent conditions: Aerosol-chemistry-climate model predictions and validation
journal, January 2015

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Carbon cost of plant nitrogen acquisition: global carbon cycle impact from an improved plant nitrogen cycle in the Community Land Model
journal, January 2016

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The Benguela Upwelling System: Quantifying the Sensitivity to Resolution and Coastal Wind Representation in a Global Climate Model
journal, December 2015

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The North Atlantic Ocean Is in a State of Reduced Overturning
journal, February 2018

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Contributions of Stratospheric Water Vapor to Decadal Changes in the Rate of Global Warming
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PHC: A Global Ocean Hydrography with a High-Quality Arctic Ocean
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An improved lake model for climate simulations: Model structure, evaluation, and sensitivity analyses in CESM1
journal, January 2012

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Assessing the Skill of the Improved Treatment of Riverine Freshwater in the Community Earth System Model (CESM) Relative to a New Salinity Climatology
journal, May 2019

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Understanding Stokes forces in the wave‐averaged equations
journal, May 2016

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Assessing a dry surface layer-based soil resistance parameterization for the Community Land Model using GRACE and FLUXNET-MTE data
journal, September 2014

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A GRACE ‐based assessment of interannual groundwater dynamics in the C ommunity L and M odel
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A new fractional snow-covered area parameterization for the Community Land Model and its effect on the surface energy balance: CLM SNOW COVER FRACTION
journal, November 2012

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Improved simulation of the terrestrial hydrological cycle in permafrost regions by the Community Land Model: IMPROVED CLM COLD-REGION HYDROLOGY
journal, March 2012

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Warming of hot extremes alleviated by expanding irrigation
journal, January 2020


Climate Forcing and Trends of Organic Aerosols in the Community Earth System Model (CESM2)
journal, December 2019

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CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble Project
journal, November 2018

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Impacts of a mushy-layer thermodynamic approach in global sea-ice simulations using the CICE sea-ice model
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Improving the Representation of Polar Snow and Firn in the Community Earth System Model: IMPROVING POLAR SNOW AND FIRN IN CESM
journal, November 2017

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Historic global biomass burning emissions for CMIP6 (BB4CMIP) based on merging satellite observations with proxies and fire models (1750–2015)
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Modelling the climate and surface mass balance of polar ice sheets using RACMO2 – Part 2: Antarctica (1979–2016)
journal, January 2018

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Greenland Surface Mass Balance as Simulated by the Community Earth System Model. Part I: Model Evaluation and 1850–2005 Results
journal, October 2013

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Different contact angle distributions for heterogeneous ice nucleation in the Community Atmospheric Model version 5
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Climate sensitivity due to increased CO2: experiments with a coupled atmosphere and ocean general circulation model
journal, June 1989

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Beyond Static Benchmarking: Using Experimental Manipulations to Evaluate Land Model Assumptions
journal, October 2019

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The RAW Filter: An Improvement to the Robert–Asselin Filter in Semi-Implicit Integrations
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Thickness distribution of Antarctic sea ice
journal, January 2008

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Predicting Near-Term Changes in the Earth System: A Large Ensemble of Initialized Decadal Prediction Simulations Using the Community Earth System Model
journal, September 2018

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A Review of the Role of the Atlantic Meridional Overturning Circulation in Atlantic Multidecadal Variability and Associated Climate Impacts
journal, June 2019

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