1. Centre for Ocean and Atmospheric Sciences School of Environmental Sciences University of East Anglia Norwich UK
2. Oceans and Atmosphere Climate Science Centre Commonwealth Scientific and Industrial Research Organisation Aspendale VIC Australia
3. Global Monitoring Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
4. National Centre for Atmospheric Science School of Environmental Sciences University of East Anglia Norwich UK
5. Institute for Marine and Atmospheric Research Utrecht University Utrecht The Netherlands
6. Institute of Energy and Climate Research – Stratosphere (IEK‐7) Jülich Germany