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A global Eta model on quasi‐uniform grids
Author(s) -
Zhang Hai,
Rančić Miodrag
Publication year - 2007
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.17
Subject(s) - curvilinear coordinates , benchmark (surveying) , terrain , domain (mathematical analysis) , mathematics , computer science , meteorology , coordinate system , computational science , mathematical optimization , geometry , mathematical analysis , physics , geology , geography , geodesy , cartography
The application of quasi‐uniform grids in global models of the atmosphere is an attempt to increase the computational efficiency by a more cost‐effective exploitation of the computing infrastructure. This paper describes the development of a global version of NCEP's regional, step‐coordinate, Eta model on two quasi‐uniform grids: cubic and octagonal. The governing equations are expressed in a general curvilinear form, so that the cubic and the octagonal versions of the model share the same code in spite of different mapping of the computational domain. The dynamical core of the derived global Eta model is successfully tested in the benchmark test of Held and Suarez. The model with the step‐wise formulation of the terrain and full physics is integrated in a series of tests with real data, and the results are compared both with the analysis and the results of the regional Eta model. Copyright © 2007 Royal Meteorological Society