Brief communication:Estimating the ice thickness of the Müller Ice Cap to support selection of a drill site

• Published in: The Cryosphere
• Main Authors: Zinck, Ann Sofie Priergaard, Grinsted, Aslak
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2022
• Subjects: Müller Ice Cap; Ice cap; Ice Sheet
• Online Access: https://curis.ku.dk/portal/da/publications/brief-communication(68e11290-b4fe-4c9b-8875-aaf4001d6573).html; https://doi.org/10.5194/tc-16-1399-2022; https://curis.ku.dk/ws/files/342925377/tc_16_1399_2022.pdf

The Müller Ice Cap will soon set the scene for a new drilling project. Therefore, ice thickness estimates are necessary for planning, since thickness measurements of the ice cap are sparse. Here, three models are presented and compared: (i) a simple Semi-Empirical Ice Thickness Model (SEITMo) based on an inversion of the shallow-ice approximation by the use of a single radar line in combination with the glacier outline, surface slope, and elevation; (ii) an iterative inverse method using the Parallel Ice Sheet Model (PISM), and (iii) a velocity-based inversion of the shallow-ice approximation. The velocity-based inversion underestimates the ice thickness at the ice cap top, making the model less useful to aid in drill site selection, whereas PISM and the SEITMo mostly agree about a good drill site candidate. However, the new SEITMo is insensitive to mass balance, computationally fast, and provides as good fits as PISM.