Original scientific paper
VORTICITY BUDGET OVER MOUNTAINS, DIAGNOSED FROM HIRLAM ANALYSES AND FORECASTS
Laura Rontu
orcid.org/0000-0003-1215-1546
; Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Abstract
The analysis of vorticity equation offers a possibility for validation and diagnostics of a NWP model. The source terms of the equation are related to the resolved and subgrid-scale torque due to the orography and surface properties. The terms resolved by the model can be estimated from three-dimensional numerical analyses and forecasts. In the vertically integrated equation, these terms sum up to give an estimate of required torque due to the subgrid-scale surface stress, which can be compared by the corresponding value
given by the physical parametrizations of the model. Diagnosis of the complicated terms of the equation requires special attention to the discretization and numerical approximations. In this study, the vorticity method is applied to the diagnosis of High Resolution Limited Area Model (HIRLAM).
Keywords
Hrčak ID:
64407
URI
Publication date:
15.12.2005.
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