Sha Feng¹, Thomas Lauvaux², Kenneth J Davis³, Christopher A Williams⁴, Yu Zhou⁴, Klaus Keller⁵, David Baker⁶, Andrew E Schuh⁷, Sourish Basu⁸, Junjie Liu⁹ and The Atmospheric Carbon and Transport - America Science Team, (1)Pennsylvania State University Main Campus, University Park, PA, United States, (2)Pennsylvania State University Main Campus, Department of Meteorology and Atmospheric Science, University Park, PA, United States, (3)The Pennsylvania State University, Department of Meteorology and Atmospheric Science, University Park, PA, United States, (4)Clark University, Graduate School of Geography, Worcester, MA, United States, (5)Pennsylvania State University, Geosciences, University Park, PA, United States, (6)NOAA, Boulder, United States, (7)Colorado State University, CIRA, Fort Collins, CO, United States, (8)NOAA, ESRL/GMD, Boulder, CO, United States, (9)Jet Propulsion Laboratory, Pasadena, CA, United States