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This work was supported by the Portuguese FCT through the CV-DUST Project (PTDC/AAC-CLI/100331/2008), the PhD fellowship of C. Gama (SFRH/BD/87468/2012) and the Post-Doctoral fellowship of J. Ferreira (SFRH/BPD/ 40620/2007). J.M. Baldasano and S. Basart acknowledge the CICYT project (CGL2010-19652 and CGL2013-46736), the ‘Supercomputacio´ n and e-ciencia’ project (CSD2007- 0050) from the Consolider-Ingenio 2010 programme and Severo Ochoa (SEV-2011-00067) programme of the Spanish Government.