School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

now at: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA

School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory, Boulder, CO, USA

Cooperative Institute for Research in Environmental Research, University of Colorado, Boulder, CO, USA

National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory, Boulder, CO, USA

Cooperative Institute for Research in Environmental Research, University of Colorado, Boulder, CO, USA

National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory, Boulder, CO, USA

Cooperative Institute for Research in Environmental Research, University of Colorado, Boulder, CO, USA

National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory, Boulder, CO, USA

Cooperative Institute for Research in Environmental Research, University of Colorado, Boulder, CO, USA

National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory, Boulder, CO, USA