Stefan Reimann¹, Matthew L Rigby², Ronald G Prinn³, Xuekun Fang³, Sunyoung Park⁴, Luke Western⁵, Alistair Manning⁶, Stephan Henne¹, Martin K Vollmer⁷ and Alison Redington⁸, (1)Empa, Duebendorf, Switzerland, (2)University of Bristol, Bristol, United Kingdom, (3)MIT, Cambridge, MA, United States, (4)Seoul National University, Seoul, Korea, Republic of (South), (5)University of Bristol, School of Chemistry, Bristol, United Kingdom, (6)UK Meteorological Office, Climate Research, Exeter, United Kingdom, (7)EMPA, Duebendorf, Switzerland, (8)UK Meteorological Office, Exeter, United Kingdom