1. Cooperative
Institute for Research in the Environmental Sciences, University of Colorado, Boulder, Colorado 80309, United States
2. Chemical Sciences Division,
Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305, United States
3. Atmospheric Research and Analysis, Inc., Cary, North Carolina 27513, United States
4. Pacific
Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, Washington 98115, United States