Jaya Khanna, National Institute of Science Education and Research, School of Earth and Planetary Sciences, Jatni, India, Benjamin R Lintner, Rutgers, New Brunswick, NJ, United States, David K Adams, Universidad Nacional Autónoma de México, Centro de Ciencias de la Atmósfera, Mexico City, Mexico and Ludmila Silva, Universidade Federal do Pará, Belem, Brazil