1. Department of Physics, University of Colorado, 390 UCB, Boulder, Colorado 80309-0390, USA
2. National Center for Atmospheric Research, P.O. Box 3000, Boulder, Colorado 80307, USA
3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA
4. Department of Atmospheric and Oceanic Sciences, University of Colorado, 311 UCB, Boulder, Colorado 80309-0311, USA
5. National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401-3305, USA