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| Titel |
Effects of resolution on the relative importance of numerical and physical horizontal diffusion in atmospheric composition modelling |
| VerfasserIn |
M. D'Isidoro, A. Maurizi, F. Tampieri |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-24), S.2737-2743 |
| Datensatznummer |
250008253
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| Publikation (Nr.) |
 copernicus.org/acp-10-2737-2010.pdf |
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| Zusammenfassung |
| Numerical diffusion induced by advection has a large influence on
concentration of substances in atmospheric composition models. At coarse
resolution numerical effects dominate, whereas at increasing model resolution
a description of physical diffusion is needed. A method to investigate the
effects of changing resolution and Courant number is defined here and is
applied to the WAF advection scheme (used in BOLCHEM), evidencing a
sub-diffusive process. The spread rate from an instantaneous source caused by
numerical diffusion is compared to that produced by the physical diffusion
necessary to simulate unresolved turbulent motions. The time at which the
physical diffusion process overpowers the numerical spread is estimated, and it
is shown to reduce as the resolution increases, and to increase with wind
velocity. |
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