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Editorial Type:
Article

Spectral Viscosity for Shallow Water Equations in Spherical Geometry

Anne Gelb1 and James P. Gleeson1
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  • 1 Department of Mathematics, Arizona State University, Tempe, Arizona
Print Publication:
01 Sep 2001
DOI:
https://doi.org/10.1175/1520-0493(2001)129<2346:SVFSWE>2.0.CO;2
Page(s):
2346–2360
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Abstract

A spherical spectral viscosity operator is proposed as an alternative to standard horizontal diffusion terms in global atmospheric models. Implementation in NCAR's Spectral Transform Shallow Water Model and application to a suite of standard test cases demonstrates improvement in resolution and numerical conservation of invariants at no extra computational cost. The retention in the spectral viscosity solution of high-wavenumber information allows the successful application of high-resolution postprocessing methods.

Corresponding author address: James Gleeson, Applied Mathematics, University College Cork, Cork, Ireland. Email: gleeson@math.la.asu.edu

Abstract

A spherical spectral viscosity operator is proposed as an alternative to standard horizontal diffusion terms in global atmospheric models. Implementation in NCAR's Spectral Transform Shallow Water Model and application to a suite of standard test cases demonstrates improvement in resolution and numerical conservation of invariants at no extra computational cost. The retention in the spectral viscosity solution of high-wavenumber information allows the successful application of high-resolution postprocessing methods.

Corresponding author address: James Gleeson, Applied Mathematics, University College Cork, Cork, Ireland. Email: gleeson@math.la.asu.edu

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