1. Space Research and Planetary Science Physics Institute, University of Bern Bern Switzerland
2. CNRS, IRD, INRAE, CEREGE, Aix Marseille Univ Aix‐en‐Provence France
3. Natural History Museum Bern Bern Switzerland
4. Department of Chemistry, Biochemistry and Pharmaceutical Sciences, Oeschger Center for Climate Change Research University of Bern Bern Switzerland