1. City University of New York Graduate Center New York NY USA
2. Atmospheric Chemistry Observations and Modeling Laboratory National Center for Atmospheric Research Boulder CO USA
3. City University of New York City College New York NY USA
4. Univeristy of Miami Miami FL USA
5. Now at National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL) Cooperative Institute for Research in Environmental Sciences (CIRES) University of Colorado Boulder CO USA