David Green, Imperial College London, MRC Centre for Environment and Health, London, United Kingdom, Hugh Coe, Department of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom, Alistair C Lewis, University of York, Wolfson Atmospheric Chemistry Laboratories, York, United Kingdom and William Bloss, University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom

Victoria Pinnegar¹, Robert J Sica², Rachel Chang³, Emily M McCullough⁴, Kimberly Strong⁵, Aldona Wiacek⁶, Debra Wunch⁵, James R Drummond⁴, Alexander Haefele⁷, Norm T O'Neill^8,9, Ellsworth Judd Welton¹⁰, Jean-Pierre Blanchet¹¹, P. Hayes¹² and Douglas Woolford¹³, (1)Western University, London, Canada, (2)Univ Western Ontario, London, ON, Canada, (3)Dalhousie University, Physics & Atmospheric Science, Halifax, NS, Canada, (4)Dalhousie University, Department of Physics and Atmospheric Science, Halifax, NS, Canada, (5)University of Toronto, Department of Physics, Toronto, ON, Canada, (6)Saint Mary's University, Environmental Science, Astronomy & Physics, Halifax, NS, Canada, (7)Federal Office of Meteorology and Climatology MeteoSwiss, Remote Sensing Group, Payerne, Switzerland, (8)Cartel Univ Sherbrooke, Sherbrooke, QC, Canada, (9)University of Sherbrooke, Sherbrooke, QC, Canada, (10)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (11)University of Quebec at Montreal UQAM, Earth and Atmospheric Sciences, Montreal, QC, Canada, (12)Université de Montréal, Department of Chemistry, Montréal, QC, Canada, (13)University of Western Ontario, London, Canada

Elizabeth Asher, Cooperative Institute for Research in Environmental Sciences, Chemical Sciences Division, Boulder, CO, United States, Troy D Thornberry, NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States, David W Fahey, NOAA ESRL, Boulder, CO, United States, Allison C McComiskey, Brookhaven National Laboratory, Upton, NY, United States, Kai-Lan Chang, NOAA Boulder, Boulder, CO, United States, Ken S Carslaw, University of Leeds, Leeds, United Kingdom, Lea-Sophie Grunau, University of Leeds, School of Earth and Environment, Leeds, United Kingdom and Ru-Shan Gao, NOAA Earth System Research Laboratory, Chemical Sciences Laboratory, Boulder, CO, United States

Nicholas Webb¹, Brandon L Edwards², Sarah McCord², Brandon Bestelmeyer³, Joel Brown⁴, Jeffrey Herrick³ and Loretta Metz⁵, (1)USDA-ARS Jornada Exp. Range, Las Cruces, NM, United States, (2)USDA-ARS Jornada Experimental Range, Las Cruces, NM, United States, (3)USDA-ARS Jornada Experimental Range, Las Cruces, United States, (4)USDA-NRCS Ecological Sites Team, Las Cruces, United States, (5)USDA-NRCS Resource Inventory and Assessment Division, Tucson, United States

Stijn Wielandt, Patrick McClure, Baptiste Dafflon and Susan S. Hubbard, Lawrence Berkeley National Laboratory, Berkeley, CA, United States

Aaron Meyer, University of Utah, Salt Lake City, UT, United States and Brian J O L McPherson, Univ Utah, Department of Civil and Environmental Engineering, Salt Lake City, UT, United States

Jacquelyn C Witte¹, Steven Oncley², Matthew Paulus¹, Kurt Knudson¹, Daniel Buonome¹, Isabel Suhr¹, Paul E Ourada³ and Christopher Roden¹, (1)National Center for Atmospheric Research, Earth Observing Laboratory, Boulder, CO, United States, (2)National Center for Atmospheric Research, Boulder, CO, United States, (3)BluSkai Systems, LLC, Boulder, CO, United States

Sreeparvathy Vijay, Indian Institute of Science, Civil Engineering Department, Bangalore, India and Srinivas Venkata Vemavarapu, Indian Institue of Science, Civil Engineering Department, Interdisciplinary Centre for Water Research (ICWaR), Bangalore, India