1. Department of Physics and Laboratory for Space SciencesWashington University in St. LouisSt. LouisMO63130USA
2. Institute for Materials Science and EngineeringWashington University in St. LouisSt. LouisMO63130USA
3. Department of Earth SciencesRoyal Holloway University of LondonEghamSurrey, TW20 0EXUK
4. Department of GeographyUniversity of PortsmouthPortsmouthPO1 3HEUK
5. Department of Earth and Planetary SciencesUniversity of California DavisDavisCA95616USA
6. School of Earth Sciences and Environmental SustainabilityNorthern Arizona UniversityFlagstaff, AZ 86011USA