Experiments With Atmospheric Primitive-Equation Models.
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Authors
Kesel, Philip Garland
Subjects
Advisors
Williams, Roger T.
Date of Issue
1968-12
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Monterey, CA; Naval Postgraduate School
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Abstract
Two atmospheric prediction models, based upon the meteorological primitive equations, were programmed and tested on the CDC 6500 computer, A frictionless , barotropic model was integrated, using ten-minute time steps, at 500 MBS for periods up to four days . Then, an n-level, baroclinic model for an inviscid, adiabatic atmosphere was integrated for brief test periods at five uniformly-spaced zeta (sigma) surfaces over a smooth earth. Both models were initialized with actual data fields provided by FNWC Monterey. Acceptability was based on measurements of energy and vorticity parameters, as well as on qualitative assessments of output fields. The barotropic 500 MB height forecasts were found to be comparable to the FNWC (vorticity model) barotropic forecasts. Mean-square -vorticity and kinetic energy were suitably conserved for integrations up to four days. An energy accumulation in the smaller range of scale was increasingly evident beyond two days into the forecast period. No smoothing was performed to control this accumulation, A limited number of test integrations was made with the five-level model. Computational instabilities were observed for forecasts beyond twelve hours. Interim results are presented.
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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.