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Croatian Meteorological Journal, Vol. 40 No. 40, 2005.

Original scientific paper

ALADIN/HR: TESTING THE NEW SEMI-LAGRANGIAN HORIZONTAL DIFFUSION SCHEME

Martina Tudor orcid id orcid.org/0000-0002-2683-2652 ; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Vlasta Tutiš ; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Dunja Drvar ; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Ivana Stiperski ; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Filip Vaña ; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb

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Abstract

Main role of the horizontal diffusion schemes in numerical models nowadays is to remove the information without forecast value and the energy accumulated due to finite truncation of a model
spectrum acting as a numerical filter. However, during intensive cyclogenesis, especially over steep surfaces, the physical horizontal diffusion should not be neglected. A stable and efficient non-linear
horizontal diffusion, based on the control of the degree of interpolation needed for the Semi-Lagrangian advection scheme, has been implemented in ALADIN. The results of several numerical experiments show better simulation of a mesoscale Adriatic cyclones, upper troposphere cyclones and beneficial impact on forecast of low cloudiness in anticyclones.

Keywords

Semi-Lagrangian; horizontal diffusion; Adriatic cyclone

Hrčak ID:

64607

URI

https://hrcak.srce.hr/64607

Publication date:

15.12.2005.

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