1. Institut für Physik der Atmosphäre, Johannes Gutenberg-Universität, 55128 Mainz, Germany
2. Department of Physical and Environmental Sciences, Texas A&M University─ Corpus Christi, Corpus Christi, Texas 78412, United States
3. Center for Water Supply Studies, Texas A&M University─ Corpus Christi, Corpus Christi, Texas 78412, United States
4. Departamento de Química, Universidade de São Paulo, Ribeirão Preto, SP 14040-901, Brazil