1. Desert Research Institute, Division of Atmospheric
Sciences, Reno, Nevada 89512, United States
2. Cooperative
Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado 80309, United States
3. Earth
System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305, United States
4. School
of Earth Sciences, Woods Institute for the Environment, and Precourt
Institute for Energy, Stanford University, Stanford, California 94305, United States
5. Duke University, Nicholas School of the Environment
and Center on Global Change, Durham, North Carolina 27708, United States