ATMOSPHERE & CLIMATE DYNAMICS GROUP

DEPARTMENT OF GEOGRAPHY-HAROKOPIO UNIVERSITY OF ATHENS

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The non-hydrostatic limited area model WRF-NMM ver3.0 has been installed and configured at the parallel computational infrastructure of the Geography Department since December 2007. The model runs on a daily basis and produces a 120-hour (5 days) weather forecast for Europe and the Mediterranean basin. WRF is a reliable modeling system with high computational efficiency for the simulation of atmospheric processes (e.g. convective systems, synoptic and sub-synoptic circulation etc). Its operational execution is performed over two domains: a coarse one consisted of 305x273 grid points, on 0.09°x0.09° horizontal resolution (~12km), with time step of 30sec and 38 vertical levels up to 25mb. The nested domain is consisted of 249x269 points, covers the area of Eastern Mediterranean and Greece with a 0.03°x0.03° horizontal resolution (~4km), and a time step of 10sec. The resolution of the nested grid is the highest acquired over the Greek area on an operational basis. The two domains are shown in the following figure.

More information about the schemes in WRF-NMM forecasting systems are given here. topo3.nest

USGS DEM database (30x30sec) is used for the topography, 24 categories of the USGS (30x30sec) are used for the definition of the vegetation types, and 16 categories of the FAO (30x30sec) for the determination of soil type. Real-time global (rtg) data is used for the sea surface temperature on a 0.083°x0.083° resolution. Initial and boundary conditions are derived from the GFS/NCEP forecasting system on a 0.5°x0.5° resolution. Appropriate algorithms have been developed in order to produce the primitive model outputs on GRIB/GRIB2/NETCDF format.

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