1. Department of Geography University of Vermont 207 Old Mill Building, 94 University Place Burlington VT 05405 USA
2. Laboratory of Tree‐Ring Research University of Arizona Tucson AZ 85721 USA
3. Department of Geography Swansea University Singleton Park Swansea SA2 8PP UK
4. Department of Geology University of Vermont 319 Delehanty Hall, 180 Colchester Avenue Burlington VT 05405 USA
5. School of Earth and Ocean Sciences Cardiff University Main Building, Park Place Cardiff CF10 3AT UK