Slippery Rock University, Department of Geography, Geology, and the Environment 1 Morrow Way, Slippery Rock, PA 16057, United States
Center for Atmospheric Chemistry Studies, Graduate School of Oceanography University of Rhode Island South Ferry Rd., Narragansett, RI 02882, United States
Global Monitoring Division, NOAA, Boulder, CO 80301, United States
Global Monitoring Division, NOAA, Boulder, CO 80301, United States
Slippery Rock University, Department of Geography, Geology, and the Environment 1 Morrow Way, Slippery Rock, PA 16057, United States