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On the effects of horizontal diffusion, resolution and orography on precipitation forecasting in a limited area model
SMHI, Research Department, Meteorology.
1999 (English)In: Meteorological Applications, ISSN 1350-4827, E-ISSN 1469-8080, Vol. 6, no 1, 49-58 p.Article in journal (Refereed) Published
Abstract [en]

Precipitation forecasting experiments have been carried out with HIRLAM, a numerical weather prediction model. The model has been run with three different horizontal gridlengths: 22, 11 and 5.5 Km. An attempt has been made to estimate the appropriate magnitude of the horizontal diffusion, which is used to control small-scale noise in the model, by looking at Kinetic energy spectra. It is shown that, for the higher resolutions, smoothing the orography gives smoother precipitation patterns. The small-scale precipitation resulting from runs with the original orography has negligible extra skill compared to the smoothed orography runs. The results show that the model is able to forecast good precipitation amounts, even with 22 Km gridlengths. No significant improvements occur when the higher horizontal resolutions are used. Experiments have been performed using the tendencies of the physical parameterisations computed on a coarser grid than that of the dynamics. The resulting precipitation patterns are very similar and this indicates a more economical way of integrating the model.

Place, publisher, year, edition, pages
1999. Vol. 6, no 1, 49-58 p.
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:smhi:diva-1539DOI: 10.1017/S1350482799001048ISI: 000080987900005OAI: oai:DiVA.org:smhi-1539DiVA: diva2:851274
Available from: 2015-09-04 Created: 2015-08-31 Last updated: 2015-09-04Bibliographically approved

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