Daniel A Rajewski¹, Eugene S Takle¹, Andy VanLoocke¹, Samantha Purdy¹, Jielun Sun² and Sergej Zilitinkevich^3,4, (1)Iowa State University, Ames, IA, United States, (2)NorthWest Research Associates, Boulder, CO, United States, (3)Finnish Meteorological Institute, Helsinki, Finland, (4)Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki, Finland