Alexander Sinyuk¹, Brent Holben², Thomas F Eck³, Ilya Slutsker⁴, David Matthew Giles⁴, Joel Schafer⁵, Alexander Smirnov¹ and Mikhail G Sorokin⁴, (1)Science Systems and Applications, Inc., Greenbelt, MD, United States, (2)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (3)Nasa Goddard SFC, Greenbelt, MD, United States, (4)Science Systems and Applications, Inc., Lanham, MD, United States, (5)NASA GSFC, Greenbelt, MD, United States