1. Department of Earth and Atmospheric Science, Purdue University, 550 Stadium Mall Drive, West Lafayette, Indiana, Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47906, Department of Aviation Technology, Purdue University, 1401 Aviation Drive, West Lafayette, Indiana 47907, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305, and Department of Agronomy, Purdue University, 15 West State Street, West Lafayette, Indiana 47907