1. Department of Physical and Chemical Sciences; Università degli Studi de L'Aquila; L'Aquila Italy
2. Center of Excellence CETEMPS; Università degli Studi de L'Aquila; L'Aquila Italy
3. GESTAR/Johns Hopkins University; NASA GSFC; Greenbelt Maryland USA
4. Atmospheric Sciences and Global Change Division; Pacific Northwest National Laboratory; Richland Washington USA
5. Department of Environmental Sciences, Rutgers University, New Brunswick; New Jersey USA
6. Japan Agency for Marine-Earth Science and Technology; Yokohama Japan
7. ENEA, Ente per le Nuove Tecnologie, l'Energia e l'Ambiente; Rome Italy
8. National Center for Atmospheric Research; Boulder Colorado USA