Supplementary Files for: Community heat flow recommendations: suitable basal boundary conditions for Greenland and Antarctica in ISMIP7

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Lösing, Mareen; Colgan, William; Stål, Tobias; Ebbing, Jörg; Busck, Anne G.; Zhang, Tong; Seroussi, Hélène L.; McCormack, Felicity; Fahrner, Dominik; Stearns, Leigh; Svendsen, Synne H.; Reading, Anya, 2026, "Supplementary Files for: Community heat flow recommendations: suitable basal boundary conditions for Greenland and Antarctica in ISMIP7", https://doi.org/10.22008/FK2/RJNF92, GEUS Dataverse, V1

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Description	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 geophysicalmodels 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 As a result, many ice sheet models rely on uniform GHF estimates, ensemble averages or outdated fields that oversimplify reality.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 GHF fields generally fall into three categories: (1) outdated due to improved data availability, (2) overly simplified parameterisations and (3) current and preferred.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, data dependency and provide guidance on their use in different applications. Finally, we recommend two Antarctic and one Greenlandic GHF field(s) for ISMIP7.
Subject	Earth and Environmental Sciences
Keyword	geothermal heat flow, basal boundary conditions, Ice sheet modelling (ISMIP7), Antarctica and Greenland, expert elicitation survey
License/Data Use Agreement	CC0 1.0

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	ReadMe.odt application/vnd.oasis.opendocument.text - 40.6 KB Published Apr 8, 2026 0 Downloads MD5: 504e7369f24b618007b72cdcd2a8c52d	Access File File Access Public Download Options application/vnd.oasis.opendocument.text Download Metadata Data File Citation EndNote XML RIS BibTeX
	Supplementary File 1 Adobe PDF - 292.8 KB Published Apr 8, 2026 1 Download MD5: a826a279d8d9a6c08292362f2c26e8c5 GHF Methods Overview	Access File File Access Public Download Options Adobe PDF Download Metadata Data File Citation EndNote XML RIS BibTeX
	Supplementary File 2 Adobe PDF - 3.5 MB Published Apr 8, 2026 1 Download MD5: 36391d38770e78cc6d66074547df44cc Survey results	Access File File Access Public Download Options Adobe PDF Download Metadata Data File Citation EndNote XML RIS BibTeX

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Persistent Identifier	doi:10.22008/FK2/RJNF92
Publication Date	2026-04-08
Title	Supplementary Files for: Community heat flow recommendations: suitable basal boundary conditions for Greenland and Antarctica in ISMIP7
Author	Lösing, Mareen (The University of Western Australia) - ORCID: https://orcid.org/0000-0002-9222-2107 Colgan, William (GEUS) - ORCID: https://orcid.org/0000-0001-6334-1660 Stål, Tobias (School of Natural Sciences (Physics), University of Tasmania, Hobart, Australia) - ORCID: https://orcid.org/0000-0002-4323-6748 Ebbing, Jörg (Institute of Geosciences, Kiel University, Germany) - ORCID: https://orcid.org/0000-0001-7492-5338 Busck, Anne G. (Department of Geosciences and Natural Resource Management, (IGN), Copenhagen University, Denmark) - ORCID: https://orcid.org/0000-0002-7328-795X Zhang, Tong (State Key Laboratory of Earth Surface Processes and Disaster Risk Reduction, Faculty of Geographical Science, Beijing Normal University, Beijing, China) - ORCID: https://orcid.org/0000-0001-9074-4166 Seroussi, Hélène L. (Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA) - ORCID: https://orcid.org/0000-0001-9201-1644 McCormack, Felicity (Securing Antarctica's Environmental Future, School of Earth, Atmosphere & Environment, Monash University, Clayton, Kulin Nations, Victoria, Australia) - ORCID: https://orcid.org/0000-0002-2324-2120 Fahrner, Dominik (Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, 1350, Copenhagen, Denmark) - ORCID: https://orcid.org/0000-0002-7895-1557 Stearns, Leigh (University of Pennsylvania, Philadelphia, USA) - ORCID: https://orcid.org/0000-0001-7358-7015 Svendsen, Synne H. (GEUS, Denmark) - ORCID: Svendsen Reading, Anya (School of Natural Sciences (Physics), University of Tasmania, Hobart, Australia) - ORCID: https://orcid.org/0000-0002-9316-7605
Point of Contact	Use email button above to contact. Witcombe, Nicola Anne (Geus.dk)
Description	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 geophysicalmodels 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, data dependency and provide guidance on their use in different applications. Finally, we recommend two Antarctic and one Greenlandic GHF field(s) for ISMIP7.
Subject	Earth and Environmental Sciences
Keyword	geothermal heat flow, basal boundary conditions, Ice sheet modelling (ISMIP7), Antarctica and Greenland, expert elicitation survey
Related Publication	doi: 10.34194/r0w9rf81
Depositor	Witcombe, Nicola Anne
Deposit Date	2026-03-10

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Journal	62 0
Type of Article	review article

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