[1] CREAF, Barcelona 08193, Catalonia, Spain
[2] UAB, CSIC, CREAF, Global Ecol Unit, Barcelona 08193, Catalonia, Spain
[3] Weizmann Inst Sci, Dept Earth & Planetary Sci, IL-76100 Rehovot, Israel
[4] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA
[5] Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA USA
[6] Washington State Univ, Dept Civil & Environm Engn, Pullman, WA 99164 USA