edu.ucar.opensky::articles:23188 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:16:24.394419 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7v98c85 The Community Earth System Model Version 2 (CESM2) 2020-02-06T00:00:00Z publication https://n2t.org/ark:/85065/d7v98c85 https://doi.org/10.1029/2019MS001916 Danabasoglu, Gokhan author Lamarque, Jean-François author Bacmeister, Julio author Bailey, David A. author DuVivier, Alice K. author Edwards, James author Emmons, Louisa K. author Fasullo, John T. author García, Rolando R. author Gettelman, Andrew author Hannay, Cecile E. author Holland, Marika M. author Large, William G. author Lauritzen, Peter H. author Lawrence, David M. author Lenaerts, Jan author Lindsay, Keith author Lipscomb, William author Mills, Michael J. author Neale, Richard author Oleson, Keith W. author Otto-Bliesner, Bette author Phillips, Adam author Sacks, William J. author Tilmes, Simone author Kampenhout, L. author Vertenstein, Mariana author Bertini, Alice author Dennis, John M. author Deser, Clara author Fischer, Chris author Fox-Kemper, B. author Kay, J. E. author Kinnison, Douglas E. author Kushner, P. J. author Larson, V. E. author Long, Matthew author Mickelson, Sheri author Moore, J. K. author Nienhouse, Eric J. author Polvani, L. author Rasch, P. J. author Strand, Warren G. author UCAR/NCAR - Library publisher 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 preindustrial control and historical ensemble simulations is presented. These simulations were performed using the nominal 1 degrees horizontal resolution configuration of the coupled model with both the "low-top" (40 km, with limited chemistry) and "high-top" (130 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 shortwave cloud forcing biases; better representation of the Madden-Julian Oscillation; better El Nino-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 degrees 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 degrees C is comparable to that of CESM1. The model outputs from these and many other simulations are available to the research community, and they represent CESM2's contributions to the Coupled Model Intercomparison Project Phase 6. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation