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A global multilevel atmospheric model using a vector semi-Lagrangian finite-difference scheme. I - Adiabatic formulationAn adiabatic global multilevel primitive equation model using a two time-level, semi-Lagrangian semi-implicit finite-difference integration scheme is presented. A Lorenz grid is used for vertical discretization and a C grid for the horizontal discretization. The momentum equation is discretized in vector form, thus avoiding problems near the poles. The 3D model equations are reduced by a linear transformation to a set of 2D elliptic equations, whose solution is found by means of an efficient direct solver. The model (with minimal physics) is integrated for 10 days starting from an initialized state derived from real data. A resolution of 16 levels in the vertical is used, with various horizontal resolutions. The model is found to be stable and efficient, and to give realistic output fields. Integrations with time steps of 10 min, 30 min, and 1 h are compared, and the differences are found to be acceptable.
Document ID
19930041272
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bates, J. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moorthi, S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Higgins, R. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Monthly Weather Review
Volume: 121
Issue: 1
ISSN: 0027-0644
Subject Category
Meteorology And Climatology
Accession Number
93A25269
Distribution Limits
Public
Copyright
Other

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