1. Atmospheric Turbulence and Diffusion Division, Air Resources Laboratory, National Oceanic and Atmospheric Administration, Oak Ridge, TN, USA
2. National Oceanic and Atmospheric Administration Environmental Cooperative Science Center, School of the Environment, Florida A&M University, Tallahassee, FL, USA
3. Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, USA