Articles | Volume 11, issue 1
Geosci. Model Dev., 11, 257–281, 2018
Geosci. Model Dev., 11, 257–281, 2018

Model description paper 18 Jan 2018

Model description paper | 18 Jan 2018

The ALADIN System and its canonical model configurations AROME CY41T1 and ALARO CY40T1

Piet Termonia1,2, Claude Fischer3, Eric Bazile3, François Bouyssel3, Radmila Brožková4, Pierre Bénard3, Bogdan Bochenek5, Daan Degrauwe1,2, Mariá Derková6, Ryad El Khatib3, Rafiq Hamdi1, Ján Mašek4, Patricia Pottier3, Neva Pristov7, Yann Seity3, Petra Smolíková4, Oldřich Španiel6, Martina Tudor8, Yong Wang9, Christoph Wittmann9, and Alain Joly3 Piet Termonia et al.
  • 1Royal Meteorological Institute, Brussels, Belgium
  • 2Department of Physics and Astronomy, Ghent university, Ghent, Belgium
  • 3CNRM/GMAP, Météo-France, Toulouse, France
  • 4Czech Hydrometeorological Institute, Prague, Czech Republic
  • 5Institute of Meteorology and Water Management – State Research Institute of Poland, Krakow, Poland
  • 6Slovak Hydrometeorological Institute, Bratislava, Slovakia
  • 7Slovenian Environment Agency, Ljubljana, Slovenia
  • 8Meteorological and Hydrological Service, Zagreb, Croatia
  • 9Zentralanstalt für Meteorologie und Geodynamik, Vienna, Austria

Abstract. The ALADIN System is a numerical weather prediction (NWP) system developed by the international ALADIN consortium for operational weather forecasting and research purposes. It is based on a code that is shared with the global model IFS of the ECMWF and the ARPEGE model of Météo-France. Today, this system can be used to provide a multitude of high-resolution limited-area model (LAM) configurations. A few configurations are thoroughly validated and prepared to be used for the operational weather forecasting in the 16 partner institutes of this consortium. These configurations are called the ALADIN canonical model configurations (CMCs). There are currently three CMCs: the ALADIN baseline CMC, the AROME CMC and the ALARO CMC. Other configurations are possible for research, such as process studies and climate simulations.

The purpose of this paper is (i) to define the ALADIN System in relation to the global counterparts IFS and ARPEGE, (ii) to explain the notion of the CMCs, (iii) to document their most recent versions, and (iv) to illustrate the process of the validation and the porting of these configurations to the operational forecast suites of the partner institutes of the ALADIN consortium.

This paper is restricted to the forecast model only; data assimilation techniques and postprocessing techniques are part of the ALADIN System but they are not discussed here.

Short summary
This paper describes the ALADIN System that has been developed by the international ALADIN consortium of 16 European and northern African partners since its creation in 1990. The paper also describes how its model configurations are used by the consortium partners for their operational weather forecasting applications and for weather and climate research.