1. NOAA ESRL Chemical Sciences Division; Boulder Colorado USA
2. National Center for Atmospheric Research; Boulder Colorado USA
3. UCAR/NOAA Geophysical Fluid Dynamics Laboratory; Princeton New Jersey USA
4. NOAA Geophysical Fluid Dynamics Laboratory; Princeton New Jersey USA
5. Goddard Institute for Space Studies; National Aeronautics and Space Agency; New York New York USA
6. Institute for Atmospheric and Climate Science; ETHZ; Zürich Switzerland
7. rdscientific; Newbury Berkshire UK
8. CIRES; University of Colorado; Boulder Colorado USA
9. National Institute for Environmental Studies; Tsukuba Ibaraki Japan
10. IEK-8; Forschungszentrum Juelich; Juelich Germany
11. Hohenpeissenberg Meteorological Observatory; German Meteorological Service; Hohenpeissenberg Germany
12. Karlsruhe Institute of Technology; IMK-IFU; Garmisch-Partenkirchen Germany
13. Deceased
14. Swiss Federal Laboratories for Materials Science and Technology; Duebendorf Switzerland
15. Air Pollution Control and Climate Change Mitigation; Environment Agency; Vienna Austria