1. Department of Applied Physics; University of Granada; Granada 18071 Spain
2. Andalusian Center for Environmental Research; Universidad de Granada; Granada 18071 Spain
3. Gwangju Institute of Science and Technology (GIST); 1 Cheomdan-Gwagiro (Oryong-dong) Buk-Gu Gwangju 500-712 Republic of Korea
4. Leibniz Institute for Tropospheric Research (IfT); Permoserstrasse 15, 04318 Leipzig Germany
5. Now at Science Systems and Applications, Inc.; NASA Langley Research Center,; Hampton USA