Locations and thickness of sediment-laden basal ice zones at Jutulstraumen Glacier onset (East Antarctica)


Understanding the material properties and physical conditions of basal ice is crucial for a comprehensive understanding of Antarctic ice-sheet dynamics. Yet, direct data are sparse and difficult to acquire, necessitating geophysical data for analysis. Here, we employed high-resolution ultra-wideband radar to map high-backscatter zones near the glacier bed within East Antarctica's Jutulstraumen drainage basin. Our results revealed that the basal ice in an area of ~ 10,000 square kilometers is composed of along-flow oriented sediment-laden basal ice units connected to the basal substrate, extending up to several hundred meters of thickness. Three-dimensional thermomechanical modeling suggests these units formed via basal freeze-on of subglacial water originating further upstream. Our findings suggest that basal freeze-on, and the entrainment and transport of subglacial material play a significant role for an accurate representation of material, physical, and rheological properties of the Antarctic ice sheet's basal ice, ultimately enhancing the accuracy and reliability of ice-sheet modeling.Here, we publish locations and thickness of high-backscatter zones at the onset of the Jutulstraumen glacier in East Antarctica.

DOI https://doi.org/10.1594/PANGAEA.963889
Related Identifier IsSupplementTo https://doi.org/10.1029/2023GL107164
Related Identifier References https://doi.org/10.1109/TGRS.2023.3277874
Related Identifier References https://doi.org/10.1594/PANGAEA.963891
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.963889
Creator Franke, Steven ORCID logo; Wolovick, Michael ORCID logo
Publisher PANGAEA
Publication Year 2024
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 506043073 https://gepris.dfg.de/gepris/projekt/506043073 DANGER DML - Deciphering the evolution of an East Antarctic drainage system over the last glacial cycle in western Dronning Maud Land
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 101008 data points
Discipline Earth System Research
Spatial Coverage (1.000W, -74.078S, 3.824E, -73.020N); Antarctica
Temporal Coverage Begin 2018-12-22T09:12:50Z
Temporal Coverage End 2018-12-30T12:45:21Z