1. Departamento de Ciencias de la Atmósfera, Facultad de Ciencias; Universidad de la Republica; Montevideo Uruguay
2. Earth System Physics Section; The Abdus Salam International Centre for Theoretical Physics, Trieste; Italy
3. Universidad Nacional del Sur; Bahia Blanca; Argentina
4. Instituto Nazionale di Oceanografia e di Geofisica Sperimentale; Trieste; Italy
5. Rossby Centre; Swedish Meteorological and Hydrological Institute, Norrköpping; Sweden