Modeled freeze-on rates at Jutulstraumen Glacier onset (East Antarctica)

• Main Authors: Wolovick, Michael, Franke, Steven
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: 3D Thermomechanical modeling; Antarctica; basal freeze-on; basal ice; File content; Image; Jutulstraumen; JutulstraumenGlacier_model; Model; netCDF file; Subglacial sediments; Antarctic; The Antarctic; East Antarctica; Jutulstraumen Glacier; Antarc*; Ice Sheet
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.963891; https://doi.org/10.1594/PANGAEA.963891

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 the outputs of our three-dimensional thermomechanical modeling.