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The DOE E3SM Model Version 2: Overview of the Physical Model and Initial Model Evaluation

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1029/2022MS003156· OSTI ID:1902585
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  1. Lawrence Livermore National Laboratory Livermore CA USA
  2. Los Alamos National Laboratory Los Alamos NM USA
  3. Brookhaven National Laboratory Upton NY USA
  4. Sandia National Laboratories Albuquerque NM USA
  5. Pacific Northwest National Laboratory Richland WA USA
  6. Departments of Earth System Science and Computer Science University of California Irvine CA USA
  7. Climate and Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA
  8. Argonne National Laboratory Lemont IL USA
  9. Pacific Northwest National Laboratory Richland WA USA, Department of Mathematical Sciences University of Wisconsin‐Milwaukee Milwaukee WI USA
  10. Lawrence Berkeley National Laboratory Berkeley CA USA
  11. Department of Mathematical Sciences University of Wisconsin‐Milwaukee Milwaukee WI USA
  12. Department of Earth System Science University of California Irvine CA USA, Joint Center for Satellite Data Assimilation Boulder CO USA
  13. Department of Hydrology and Atmospheric Sciences University of Arizona Tucson AZ USA
  14. Oak Ridge National Laboratory Oak Ridge TN USA
  15. Department of Hydrology and Atmospheric Sciences University of Arizona Tucson AZ USA, Now at ERT Inc. and NOAA/NWS/NCEP Climate Prediction Center MD College Park USA
  16. Department of Earth System Science University of California Irvine CA USA
  17. Los Alamos National Laboratory Los Alamos NM USA, The Hong Kong University of Science and Technology (Guangzhou) Guangzhou Guangdong China
  18. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
+ Show Author Affiliations
Abstract

This work documents version two of the Department of Energy's Energy Exascale Earth System Model (E3SM). E3SMv2 is a significant evolution from its predecessor E3SMv1, resulting in a model that is nearly twice as fast and with a simulated climate that is improved in many metrics. We describe the physical climate model in its lower horizontal resolution configuration consisting of 110 km atmosphere, 165 km land, 0.5° river routing model, and an ocean and sea ice with mesh spacing varying between 60 km in the mid‐latitudes and 30 km at the equator and poles. The model performance is evaluated with Coupled Model Intercomparison Project Phase 6 Diagnosis, Evaluation, and Characterization of Klima simulations augmented with historical simulations as well as simulations to evaluate impacts of different forcing agents. The simulated climate has many realistic features of the climate system, with notable improvements in clouds and precipitation compared to E3SMv1. E3SMv1 suffered from an excessively high equilibrium climate sensitivity (ECS) of 5.3 K. In E3SMv2, ECS is reduced to 4.0 K which is now within the plausible range based on a recent World Climate Research Program assessment. However, a number of important biases remain including a weak Atlantic Meridional Overturning Circulation, deficiencies in the characteristics and spectral distribution of tropical atmospheric variability, and a significant underestimation of the observed warming in the second half of the historical period. An analysis of single‐forcing simulations indicates that correcting the historical temperature bias would require a substantial reduction in the magnitude of the aerosol‐related forcing.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; AC05-76RL01830; AC52-07NA27344; NA0003525; SC0012704
OSTI ID:
1902585
Alternate ID(s):
OSTI ID: 1907023
OSTI ID: 1958369
OSTI ID: 1959510
OSTI ID: 1960259
OSTI ID: 2212484
Report Number(s):
BNL--224093-2023-JAAM; LLNL--JRNL-834029; e2022MS003156
Journal Information:
Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Journal Issue: 12 Vol. 14; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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54 ENVIRONMENTAL SCIENCES
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