1. Climate Physics Group; Jet Propulsion Laboratory; California Institute of Technology; m/s 233-300 Pasadena CA 91109-8099 USA
2. Joint Institute for Regional Earth System Science & Engineering; University of California Los Angeles; 607 Charles E Young Drive East, Young Hall, Room 4242 Los Angeles CA 90095-7228 USA
3. Department of Civil and Environmental Engineering; University of Illinois; 2527B Hydrosystems Laboratory, 301 North Mathews Avenue Urbana IL 61801-2352 USA
4. Department of Atmospheric Sciences; University of Illinois; 150 South Gregory Street Urbana IL 61801-3070 USA
5. Department of Crop Sciences; University of Illinois; AW-101 Turner Hall, 1102 South Goodwin Avenue Urbana IL 61801 USA
6. Department of Plant Biology; University of Illinois; 265 Morrill Hall, 505 South Goodwin Avenue Urbana IL 61801 USA