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A survey of nested grid techniques and their potential for use within the MASS weather prediction modelA survey of various one- and two-way interactive nested grid techniques used in hydrostatic numerical weather prediction models is presented and the advantages and disadvantages of each method are discussed. The techniques for specifying the lateral boundary conditions for each nested grid scheme are described in detail. Averaging and interpolation techniques used when applying the coarse mesh grid (CMG) and fine mesh grid (FMG) interface conditions during two-way nesting are discussed separately. The survey shows that errors are commonly generated at the boundary between the CMG and FMG due to boundary formulation or specification discrepancies. Methods used to control this noise include application of smoothers, enhanced diffusion, or damping-type time integration schemes to model variables. The results from this survey provide the information needed to decide which one-way and two-way nested grid schemes merit future testing with the Mesoscale Atmospheric Simulation System (MASS) model. An analytically specified baroclinic wave will be used to conduct systematic tests of the chosen schemes since this will allow for objective determination of the interfacial noise in the kind of meteorological setting for which MASS is designed. Sample diagnostic plots from initial tests using the analytic wave are presented to illustrate how the model-generated noise is ascertained. These plots will be used to compare the accuracy of the various nesting schemes when incorporated into the MASS model.
Document ID
19870009511
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Koch, Steven E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mcqueen, Jeffery T. (ST Systems Corp. Hyattsville, Md., United States)
Date Acquired
September 5, 2013
Publication Date
February 1, 1987
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-TM-87808
NAS 1.15:87808
REPT-87B0116
Accession Number
87N18944
Funding Number(s)
CONTRACT_GRANT: NAS5-28752
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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