1. Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2. Atmospheric Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
3. Operational Unit BEYOND Center for EO Research and Satellite Remote Sensing, IAASARS, National Observatory of Athens, 11523 Athens, Greece
4. Climate Change Centre, European Central Bank, 60314 Frankfurt, Germany
5. European Commission, Joint Research Centre, 21027 Ispra, Italy