*Jean-Claude Roger^1,2, Eric Vermote², Sergii Skakun^1,2, William Rountree^1,2, Andres Santamaria Artigas^1,2, Natacha Kalecinski^1,2, Oleg Dubovik⁴, Brent Holben³ (1.University of Maryland College Park, Departement of Geographysical Sciences, College Park, MD 20742, USA, 2.Nasa Goddard Space Flight Center, Code 619, Greenbelt, MD 20771, USA, 3.Nasa Goddard Space Flight Center, Code 618, Greenbelt, MD 20771, USA, 4.Laboratoire d'Optique Atmospherique, University of Lille, Villeneuve d’Ascq, 59655, France)