1. Instituto Português do Mar e da Atmosfera and the Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
3. Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe Institute of Technology, Karlsruhe, Germany