1. a University of Colorado Boulder, Cooperative Institute for Research in the Environmental Sciences, and NOAA/OAR/ESRL/Global Systems Laboratory, Boulder, Colorado
2. b Cooperative Institute for Marine and Atmospheric Studies, and NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida
3. c NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida
4. d Colorado State University, Cooperative Institute for Research in the Atmosphere, and NOAA/OAR/ESRL/Global Systems Laboratory, Boulder, Colorado