1. Department of Geography Johannes Gutenberg University Mainz 55099 Germany
2. Department of Geography University of Cambridge Cambridge CB23EN UK
3. Navarino Environmental Observatory Messina Greece
4. Department of Physical Geography Stockholm University Stockholm Sweden
5. Department of Geography Friedrich‐Alexander University Nürnberg‐Erlangen Erlangen 91058 Germany
6. Laboratory of Tree‐Ring Research University of Arizona Tucson AZ 85721 USA