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

It is the purpose of this paper to provide a comprehensive documentation of the new NCAR (National Center for Atmospheric Research) version of the spectral element (SE) dynamical core as part of the Community Earth System Model (CESM2.0) release. This version differs from previous releases of the SE dynamical core in several ways. Most notably the hybrid sigma vertical coordinate is based on dry air mass, the condensates are dynamically active in the thermodynamic and momentum equations (also referred to as condensate loading), and the continuous equations of motion conserve a more comprehensive total energy that includes condensates. Not related to the vertical coordinate change, the hyperviscosity operators and the vertical remapping algorithms have been modified. The code base has been significantly reduced, sped up, and cleaned up as part of integrating SE as a dynamical core in the CAM (Community Atmosphere Model) repository rather than importing the SE dynamical core from High-Order Methods Modeling environment as an external code.

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Author Lauritzen, Peter H. ORCID icon
Nair, Ramachandran ORCID icon
Herrington, Adam R. ORCID icon
Callaghan, Patrick ORCID icon
Goldhaber, Steve ORCID icon
Dennis, John M. ORCID icon
Bacmeister, Julio ORCID icon
Eaton, Brian E. ORCID icon
Zarzycki, Colin ORCID icon
Taylor, M. A.
Ullrich, P. A.
Dubos, T.
Gettelman, Andrew ORCID icon
Neale, Richard ORCID icon
Dobbins, Brian ORCID icon
Reed, K. A.
Hannay, Cecile E. ORCID icon
Medeiros, Brian ORCID icon
Benedict, J. J.
Tribbia, Joseph ORCID icon
Publisher UCAR/NCAR - Library

Publication Date 2018-07-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-12-25T15:54:46.081595
Metadata Record Identifier edu.ucar.opensky::articles:21929
Metadata Language eng; USA
Suggested Citation Lauritzen, Peter H., Nair, Ramachandran, Herrington, Adam R., Callaghan, Patrick, Goldhaber, Steve, Dennis, John M., Bacmeister, Julio, Eaton, Brian E., Zarzycki, Colin, Taylor, M. A., Ullrich, P. A., Dubos, T., Gettelman, Andrew, Neale, Richard, Dobbins, Brian, Reed, K. A., Hannay, Cecile E., Medeiros, Brian, Benedict, J. J., Tribbia, Joseph. (2018). 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. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7pv6p7n. Accessed 08 March 2026.

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