The supplementary material for this article can be found at https://doi.org/10.1017/jog.2017.85

We thank Autoridad Nacional del Agua, in particular, the staff of the Huaraz Office, the Parque Nacional Huascarán and Jesus Gomez. We also thank Oliver Wigmore for providing the DEM of Cuchillacocha Glacier as well as James DeGrand for assisting with the instrumentation. We also thank Wolfgang Gurgiser and an anonymous reviewer whose comments greatly improved the paper. The project is supported by grants from NSERC, including the Research Tools and Instruments Program, and the National Science Foundation under grants EAR-1316429 and EAR-1316432. Additional thanks to McGill University and L'École de Technologie Supérieure de Montréal for additional support. Aubry-Wake received funding for a scholarship for Master's studies from The Fonds de recherche du Québec - Nature et technologies. Please contact the corresponding author for use of published data.

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