Chi-Tsan Wang, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States, Kirsti Ashworth, Lancaster University, Lancaster Environment Centre, Lancaster, United Kingdom, William Vizuete, University of North Carolina, Chapel Hill, NC, United States, Christine Wiedinmyer, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States, Quazi ZIAUR Rasool, UNC Chapel Hill, Chapel Hill, NC, United States, Peter C Harley, Denver, Boulder, CO, United States and John Victor Ortega, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States