Comparison between wavenumber truncation and horizontal diffusion methods in spectral models
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Authors
Fan, Chenwu
Chu, Peter C.
Chen, Xiong-Shan
Subjects
Advisors
Date of Issue
2001
Date
2001
Publisher
Language
Abstract
Commonly used horizontal diffusion and wavenumber truncation dealiasing methods in spectral models are
verified using the National Center for Atmospheric Research Community Climate Model version 3. For the same
horizontal grid resolution, time step, physical processes, boundary conditions, and initial conditions, the simulated
climate, using the horizontal diffusion alone model, is better than that using the wavenumber truncation method.
In comparison with the observed climate data, the global root-mean-square of simulated January monthly mean
500-hPa geopotential using the horizontal diffusion alone model is 25% less than that using the wavenumber
truncation model. However, for the same spectral resolution, the wavenumber truncation model (high horizontal
grid resolution) leads to more accurate solutions than the horizontal diffusion model (low horizontal grid resolution).
Type
Article
Description
Monthly Weather Review, American Meteorological Society, 129, 152-158.
Series/Report No
Department
Oceanography
Organization
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NPS Report Number
Sponsors
This research was sponsored by the Naval Oceanographic Office, the Office of Naval Research NOMP program, and the Naval Postgraduate School.
Funder
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Citation
Chu, P.C., X.-S. Chen, and C.W. Fan, 2001: Comparison between wavenumber truncation and horizontal diffusion methods in spectral models (paper download). Monthly Weather Review, American Meteorological Society, 129, 152-158.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.