1. Department of Atmospheric Science; Colorado State University; Fort Collins Colorado USA
2. Department of Civil and Environmental Engineering; Massachusetts Institute of Technology; Cambridge Massachusetts USA
3. CIRES and Department of Chemistry and Biochemistry; University of Colorado; Boulder Colorado USA
4. CIRES and Department of Atmospheric and Oceanic Sciences; University of Colorado; Boulder Colorado USA
5. School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences; Harvard University; Cambridge Massachusetts USA
6. Instituto de Fisíca; Universidade de São Paulo; Sao Paulo Brazil