A spatial filter for use in finite area calculations
A multidimensional filter that selectively removes 2 Delta x and 2 Delta y noise is introduced. The filter is designed to be effective in finite-area models with nonperiodic horizontal boundary conditions. An economical splitting technique, requiring an intermediate boundary condition, is used in th...
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| Veröffentlicht in: | Monthly weather review 1988, Vol.116 (1), p.209-222 |
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| container_title | Monthly weather review |
| container_volume | 116 |
| creator | RAYMOND, W. H GARDER, A |
| description | A multidimensional filter that selectively removes 2 Delta x and 2 Delta y noise is introduced. The filter is designed to be effective in finite-area models with nonperiodic horizontal boundary conditions. An economical splitting technique, requiring an intermediate boundary condition, is used in the calculations. The filter is tested on a finite-difference representation of two-dimensional linear advection and compared with the Shapiro eighth-order filter. Tests on both uniform and variable grid configurations are conducted, as well as a finite-element calculation. Influence of repeated applications of the filters upon a rectangular column is analyzed, and comparisons between filter factors are made. Lastly, the proposed filter is inserted into the three-dimensional Penn State-NCAR regional model to test its performance in a state-of-the-art model and to study the importance of horizontal diffusion. |
| doi_str_mv | 10.1175/1520-0493(1988)116<0209:ASFFUI>2.0.CO;2 |
| format | Article |
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| fulltext | fulltext |
| identifier | ISSN: 0027-0644 |
| ispartof | Monthly weather review, 1988, Vol.116 (1), p.209-222 |
| issn | 0027-0644 1520-0493 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_18286806 |
| source | American Meteorological Society; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Earth, ocean, space Exact sciences and technology External geophysics Meteorology Weather analysis and prediction |
| title | A spatial filter for use in finite area calculations |
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