Held‐Suarez simulations with the Community Atmosphere Model Spectral Element (CAM‐SE) dynamical core: A global axial angular momentum analysis using Eulerian and floating Lagrangian vertical coordinates

Lauritzen, P. H.; Bacmeister, Julio T.; Dubos, Thomas; Lebonnois, Sébastien; Taylor, Mark A.

doi:10.1002/2013ms000268

Cited by 19 publications

(30 citation statements)

References 24 publications

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“…That said, Figure shows that CAM‐SE conserves AAM very well: The spurious torques from the dynamical core are approximately a factor of 100 smaller than the physical torques from the parameterizations. These results are very similar to the dynamical core torques found in the dry Held‐Suarez setup used in Lauritzen et al ().…”

Section: Resultssupporting

confidence: 90%

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

Lauritzen

Nair

Herrington

et al. 2018

J Adv Model Earth Syst

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126

152

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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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Section: Resultssupporting

confidence: 90%

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

Lauritzen

Nair

Herrington

et al. 2018

J Adv Model Earth Syst

Self Cite

126

152

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“…The discrete global averages

\overset{false(\cdot false)}{true}

are computed consistent with the discrete model grid as outlined in section 2.2. of Lauritzen et al (). The TE global average tendency is denoted

\partial \overset{E}{true} \equiv \frac{normald \overset{E}{true}}{normald t} .

…”

Section: Methodsmentioning

confidence: 99%

A Total Energy Error Analysis of Dynamical Cores and Physics‐Dynamics Coupling in the Community Atmosphere Model (CAM)

Lauritzen

Williamson

2019

J Adv Model Earth Syst

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A closed total energy (TE) budget is of utmost importance in coupled climate system modeling; in particular, the dynamical core or physics‐dynamics coupling should ideally not lead to spurious TE sources/sinks. To assess this in a global climate model, a detailed analysis of the spurious sources/sinks of TE in National Center for Atmospheric Research's Community Atmosphere Model (CAM) is given. This includes spurious sources/sinks associated with the parameterization suite, the dynamical core, TE definition discrepancies, and physics‐dynamics coupling. The latter leads to a detailed discussion of the pros and cons of various physics‐dynamics coupling methods commonly used in climate/weather modeling.

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“…For planetary applications, it will be important to also check the discrete angular momentum budget (Lebonnois et al, 2012;Lauritzen et al, 2014a).…”

Section: Outlook For Dynamicomentioning

confidence: 99%

DYNAMICO-1.0, an icosahedral hydrostatic dynamical core designed for consistency and versatility

Dubos¹,

Dubey

Tort³

et al. 2015

Geosci. Model Dev.

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Abstract. The design of the icosahedral dynamical core DY-NAMICO is presented. DYNAMICO solves the multi-layer rotating shallow-water equations, a compressible variant of the same equivalent to a discretization of the hydrostatic primitive equations in a Lagrangian vertical coordinate, and the primitive equations in a hybrid mass-based vertical coordinate. The common Hamiltonian structure of these sets of equations is exploited to formulate energy-conserving spatial discretizations in a unified way.The horizontal mesh is a quasi-uniform icosahedral C-grid obtained by subdivision of a regular icosahedron. Control volumes for mass, tracers and entropy/potential temperature are the hexagonal cells of the Voronoi mesh to avoid the fast numerical modes of the triangular C-grid. The horizontal discretization is that of Ringler et al. (2010), whose discrete quasi-Hamiltonian structure is identified. The prognostic variables are arranged vertically on a Lorenz grid with all thermodynamical variables collocated with mass. The vertical discretization is obtained from the three-dimensional Hamiltonian formulation. Tracers are transported using a second-order finite-volume scheme with slope limiting for positivity. Explicit Runge-Kutta time integration is used for dynamics, and forward-in-time integration with horizontal/vertical splitting is used for tracers. Most of the model code is common to the three sets of equations solved, making it easier to develop and validate each piece of the model separately.Representative three-dimensional test cases are run and analyzed, showing correctness of the model. The design permits to consider several extensions in the near future, from higher-order transport to more general dynamics, especially deep-atmosphere and non-hydrostatic equations.

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Held‐Suarez simulations with the Community Atmosphere Model Spectral Element (CAM‐SE) dynamical core: A global axial angular momentum analysis using Eulerian and floating Lagrangian vertical coordinates

Cited by 19 publications

References 24 publications

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

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

A Total Energy Error Analysis of Dynamical Cores and Physics‐Dynamics Coupling in the Community Atmosphere Model (CAM)

DYNAMICO-1.0, an icosahedral hydrostatic dynamical core designed for consistency and versatility

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