1. Department of Atmospheric Sciences, University of Arizona, Tucson, Arizona 85721-0081;
2. Joint Institute for Regional Earth System Science & Engineering, University of California, Los Angeles, California 90095;
3. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109;
4. School of Physics and Center for Geophysical Research, University of Costa Rica, San Jose, Costa Rica, 11501-2060;
5. Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523-1371;
6. Physical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305-3328;