Testing of a cell-integrated semi-Lagrangian semi-implicit nonhydrostatic atmospheric solver (CSLAM-NH) with idealized orography

A recently developed cell-integrated semi-Lagrangian (CISL) semi-implicit nonhydrostatic atmospheric solver that uses the conservative semi-Lagrangian multitracer (CSLAM) transport scheme is extended to include orographic influences. With the introduction of a new semi-implicit CISL discretization of the continuity equation, the nonhydrostatic solver, called CSLAM-NH, has been shown to ensure inherently conservative and numerically consistent transport of air mass and other scalar variables, such as moisture and passive tracers. The extended CSLAM-NH presented here includes two main modifications: transformation of the equation set to a terrain-following height coordinate to incorporate orography and an iterative centered-implicit time-stepping scheme to enhance the stability of the scheme associated with gravity wave propagation at large time steps. CSLAM-NH is tested for a suite of idealized 2D flows, including linear mountain waves (dry), a downslope windstorm (dry), and orographic cloud formation.

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Author Wong, May
Skamarock, William
Lauritzen, Peter
Klemp, Joseph
Stull, Roland
Publisher UCAR/NCAR - Library
Publication Date 2015-04-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:42:54.338117
Metadata Record Identifier edu.ucar.opensky::articles:16605
Metadata Language eng; USA
Suggested Citation Wong, May, Skamarock, William, Lauritzen, Peter, Klemp, Joseph, Stull, Roland. (2015). Testing of a cell-integrated semi-Lagrangian semi-implicit nonhydrostatic atmospheric solver (CSLAM-NH) with idealized orography. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d71r6rpc. Accessed 15 June 2025.

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