School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

NASA Langley Research Center, Hampton, Virginia, USA

NASA Langley Research Center, Hampton, Virginia, USA

Science Systems and Applications, Inc., Hampton, Virginia, USA

NASA Langley Research Center, Hampton, Virginia, USA

Science Systems and Applications, Inc., Hampton, Virginia, USA

Cooperative Institute for Research in Environmental Sciences (CIRES) and Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado, USA

now at: Tofwerk AG, Thun, Switzerland

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

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

Cooperative Institute for Research in Environmental Sciences (CIRES) and Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

NASA Langley Research Center, Hampton, Virginia, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA