1. Laboratoire des Sciences du Climat et de l’Environnement, IPSL, Orme des Merisiers, CEA-CNRS-UVSQ, 91190 Gif-sur-Yvette, France;
2. Laboratoire d’Aérologie, CNRS-UPS, Toulouse, France;
3. Zuev Institute of Atmospheric Optics, SB-RAS, Tomsk, Russia;
4. Obukhov Institute of Atmospheric Physics, RAS, Moscow, Russia;
5. Norwegian Institute for Air Research, Kjeller, Norway