1. Institute of Earth Sciences “Jaume Almera”, CSIC, Lluis Sole Sabaris s/n. 08028 Barcelona, Spain, CME/CFFS, University of Kentucky, 105 Whalen Building, 533 S. Limestone Street, Lexington, Kentucky 40506-0043, and ENDESA GENERACIÓN S.A., Ribera del Loira, 60, planta 2, sector E, 28042, Madrid, Spain