Wolovick, Michael; Franke, Steven (2024): Modeled freeze-on rates at Jutulstraumen Glacier onset (East Antarctica) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.963891
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Abstract:
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.
Supplement to:
Franke, Steven; Wolovick, Michael; Drews, Reinhard; Jansen, Daniela; Matsuoka, Kenichi; Bons, Paul D (2024): Sediment freeze‐on and transport near the onset of a fast‐flowing glacier in East Antarctica. Geophysical Research Letters, 51, e2023GL107164, https://doi.org/10.1029/2023GL107164
Related to:
Franke, Steven; Wolovick, Michael (2024): Locations and thickness of sediment-laden basal ice zones at Jutulstraumen Glacier onset (East Antarctica) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.963889
References:
Martos, Yasmina M; Catalán, Manuel; Jordan, Tom A; Golynsky, Alexander V; Golynsky, Dmitry A; Eagles, Graeme; Vaughan, David G (2017): Heat Flux Distribution of Antarctica Unveiled. Geophysical Research Letters, 44(22), https://doi.org/10.1002/2017GL075609
Funding:
German Research Foundation (DFG), grant/award no. 506043073: DANGER DML - Deciphering the evolution of an East Antarctic drainage system over the last glacial cycle in western Dronning Maud Land
Coverage:
Median Latitude: -73.900420 * Median Longitude: 4.310465 * South-bound Latitude: -75.330390 * West-bound Longitude: -3.125370 * North-bound Latitude: -72.470450 * East-bound Longitude: 11.746300
Event(s):
Comment:
Steady 3D Thermomechanical Ice Model outputs for the upstream region of the Jutulstraumen catchment:
1. NetCDF files containing the following outputs:
- AccThick: accumulated basal ice thickness in meters
- Gflux: geothermal heat flux used in Watt per square meter
- InDomain: mask indicating which grid cells were in the active part of the model domain
- MeltRate: basal melt rate in meters per year (negative values represent freeze-on)
- MeltRate_englacial: integrated englacial melt rate in meters per year
- RelTemp: basal temperature relative to the pressure-dependent melting point, in degrees C or K
- StrainHeat_basal: basal strain heating in Watt per square meter
- StrainHeat_englacial: vertically integrated englacial strain heating in Watt per square meter
- TemperateLayerThickness: thickness of temperate layer in meters
2. Plots showing all outputs
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | File content | Content | Wolovick, Michael | |||
| 2 | netCDF file | netCDF | Wolovick, Michael | 3D Thermomechanical modeling | ||
| 3 | Image | IMAGE | Wolovick, Michael | 3D Thermomechanical modeling |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
27 data points