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Abstract
Geothermal heat flow (GHF) influences ice sheet thermal conditions, affecting ice flow by sliding and deformation. However, GHF distribution under polar ice sheets remains poorly constrained, with few direct borehole-derived estimates and large discrepancies between glaciological and geophysical models caused by methodological differences and data limitations. As a result, many ice sheet models rely on uniform GHF estimates, ensemble averages or outdated fields that oversimplify reality. The choice of GHF product can lead to significantly different thermal conditions simulated at the ice-bed interface, which affects the projected evolution of ice sheets under climate warming. Therefore, we conducted an expert elicitation survey to identify the most suitable GHF fields for use as basal boundary conditions in ice sheet modelling, particularly for the Ice Sheet Modelling Intercomparison Project for CMIP7 (ISMIP7). GHF fields generally fall into three categories: (1) outdated due to improved data availability, (2) overly simplified parameterisations and (3) current and preferred. For GHF fields that rank highly in the survey, we discuss uncertainty and data dependency and guide their use in different applications. Finally, we recommend two Antarctic and one Greenlandic GHF fields for ISMIP7.
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Copyright (c) 2026 Mareen Lösing, William Colgan, Tobias Stål, Jörg Ebbing, Anne G. Busck, Tong Zhang, Hélène L. Seroussi, Felicity McCormack, Dominik Fahrner, Leigh Stearns, Synne H. Svendsen

This work is licensed under a Creative Commons Attribution 4.0 International License.
Data Availability Statement
A Methods Overview can be found in Supplementary File 1, and Expert Panel Selection, Participant Demographics and Survey Results in full, including statistical results, individual ratings, general and specific comments, can be found in Supplementary File 2 at https://doi.org/10.22008/FK2/RJNF92.
The three recommended GHF fields (Colgan et al., 2022; Lösing & Ebbing, 2021; Stål et al., 2021) together with their uncertainties, and an additional topographically corrected version, are provided on NetCDF grids in 0.15 and 0.5 km resolution (Fahrner et al., 2025) and can be downloaded here: https://doi.org/10.5281/zenodo.1708387.
Funding
M.L. and T.S. were supported by the Australian Research Council Special Research Initiative, Australian Centre for Excellence in Antarctic Science (Project Number SR200100008). W.C., D.F. and H.S. acknowledge support from the Novo Nordisk Foundation under the Challenge Programme 2023 grant number NNF23OC00807040. F.S.M. was supported by an Australian Research Council (ARC) Discovery Early Career Research Award (DECRA; DE210101433) and the ARC Special Research Initiative Securing Antarctica’s Environmental Future (SR200100005). S.H.S. was supported by the European Space Agency under the contract CryoRad Earth Explorer 12 Phase 0 Science and Requirements Consolidation Study (4000145903/24/NL/IB/ar).Downloads
An annual collection of articles submitted to GEUS Bulletin and published throughout 2026. Published online only. This issue is open for submissions until the end of 2026.
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