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. Radar sounding of the thickness of temperate glaciers ischallenged by substantial volume scattering, surface scattering and highattenuation rates. Lower-frequency radar sounders are often deployed tomitigate these effects, but the lack of a global synthesis of their successlimits progress in system and survey design. Here we extend a recent globalcompilation of glacier thickness measurements (GlaThiDa) with the centerfrequency for radar-sounding surveys. From a maximum reported thickness of∼ 1500 m near 1 MHz, the maximum thickness sounded decreasesby ∼ 500 m per frequency decade. Between 25–100 MHz, newerairborne radar sounders generally outperform older, ground-based ones. Basedon globally modeled glacier thicknesses, we conclude that a multi-element,≤30 MHz airborne radar sounder could survey most temperate glaciersmore efficiently.

Brief communication: An empirical relation between center frequency and measured thickness for radar sounding of temperate glaciers