1. Geography and Environment Science University of Southampton Highfield Southampton SO17 1BJ UK
2. Laboratoire d’ÉCologie Alpine (LECA) Université Grenoble Alpes C2 40700 38058 Grenoble France
3. Tromsø University Museum UiT ‐ The Arctic University of Norway Tromsø NO‐9037 Norway
4. Department of Arctic and Marine Biology UiT ‐ The Arctic University of Norway Tromsø Norway
5. Faculty of Physics Adam Mickiewicz University 61‐614 Poznań Poland
6. Poznań Radiocarbon Laboratory Foundation of the A. Mickiewicz University Poznań 61‐612 Poland