Radar application to infra-synoptic meteorology
See also: ARAMIS
ARAMIS ( has pplication R adar with the M eteorology I nfra- S ynoptic) is the name of the network of weather radars of France which includes/understands 23 radars of precipitations (24 in 2007) distributed on the territory of this country, including on the Corsica . The whole of the data collected and treated by ARAMIS available and is 24 hours a day renewed every fifteen minutes on the whole of the territory in the shape of a mosaic of the images of each one of these radars.
This network comprises a mixture of radars various wavelengths:
- * Of the radars of band C (5 cm wavelength) in the north of the country where the attenuation by strong precipitations is not very frequent.
- * Of the radars of band S (10 cm) in the south where the pouring rain requires a wavelength not very sensitive to the attenuation.
History
Between the middle of the years 1980 and up to 1995, the priority in France was to build a hydrological network of radars. For this purpose, Weather-France gradually built a whole of 13 radars. Sweeping was limited to angles lower than 1 degree above the horizon in order to see precipitation more close possible ground. The survey was carried out rather slowly to collect the maximum of information at each 5 minutes.The software BEAVER was developed to control the whole of these radars and to assemble their data in a mosaic giving a sight as complete as possible of the cover of precipitations on the French territory to a resolution of 1,5 km by 1,5 km. Thanks to the program OPERATED Eumetnet, the radars of the countries bordering were added to this mosaic to create a more complete image.
However, as the beam radar goes up compared to the ground, because of the curve of the Earth, the effective range of the network is only from 80 to 100 km for the hydrological use. After 1995, project HYDRORADAR, then the PANTHER project ( P rojet has ouvelles RAMIS NR T echnologies in H ydrometeorology E xtension and RE lately), launched by Weather-France and the ministry for Ecology and Sustainable development, aim respectively to add 5 (Sembadel, Bollène, Collobrières, Opoul, Aléria) then 6 (North, Cherves, Burgundy, Franche-Comté, Aveyron, Adour) other radars for densifier network ARAMIS and to optimize its use for hydrology. The project PANTHER (which also allows the renewal of 2 radars, Trappes and Toulouse) must be finished at the summer 2007 (radar of Franche-Comté).
Another change with the network is the decision to probe several angles of elevations in the Mediterranean arc in order to have a volume of survey on 3 dimensions, instead of only of the angles of very low altitude, to take account of the relief of the area. Finally, the work carried out on the diversity of polarization and the data Doppler will lead to a complete modernization of the whole network. In this respect, at at the beginning of 2008 Mélodi radar bandages S of Nimes-Manduel will be replaced by a Selex radar bandages S doubles polarization and a radome will be installed.
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