Kenneth J Davis¹, David Baker², Bianca Baier³, Zachary Barkley¹, Alison Boyer⁴, Edward V Browell⁵, Gao Chen⁶, A Scott Denning⁷, Joshua P DiGangi⁸, Jeremy Todd Dobler⁹, Sha Feng¹⁰, Alan Fried¹¹, Tobias Gerken¹², Andrew R Jacobson¹³, Klaus Keller¹⁴, Thomas Lauvaux¹⁵, Bing Lin¹⁶, Amin R Nehrir¹⁷, Michael D Obland¹⁷, Christopher O'Dell¹⁸, Sandip Pal¹⁵, Anke Roiger¹⁹, Andrew E Schuh²⁰, Colm Sweeney³, Yaxing Wei⁴, Christopher A Williams²¹ and ACT-America science team, (1)The Pennsylvania State University, Department of Meteorology and Atmospheric Science, University Park, PA, United States, (2)NOAA, Boulder, United States, (3)NOAA ESRL, Global Monitoring Division, Boulder, CO, United States, (4)Oak Ridge National Laboratory, Oak Ridge, TN, United States, (5)NASA Langley Research Ctr, Yorktown, VA, United States, (6)NASA Langley Research Ctr, Hampton, VA, United States, (7)Colorado State University, Atmospheric Sciences, Fort Collins, CO, United States, (8)Princeton University, Princeton, NJ, United States, (9)Spectral Sensor Solutions LLC, Environmental Sensing, Fort Wayne, IN, United States, (10)The Pennsylvania State University, University Park, PA, United States, (11)University of Colorado at Boulder, Institute of Arctic and Alpine Research, Boulder, CO, United States, (12)University of Bayreuth, Bayreuth, Germany, (13)NOAA Boulder, Boulder, CO, United States, (14)Pennsylvania State University, Geosciences, University Park, PA, United States, (15)Pennsylvania State University Main Campus, Department of Meteorology and Atmospheric Science, University Park, PA, United States, (16)NASA Langley Research Center - LARC, Hampton, VA, United States, (17)NASA Langley Research Center, Hampton, VA, United States, (18)Colorado State University, Fort Collins, CO, United States, (19)German Aerospace Center (DLR) Oberpfaffenhofen, Institute of Atmospheric Physics, Wessling, Germany, (20)Colorado State University, CIRA, Fort Collins, CO, United States, (21)Clark University, Graduate School of Geography, Worcester, MA, United States