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| Auteurs principaux: | , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2024
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| Accès en ligne: | https://doi.org/10.1594/PANGAEA.963889 |
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| _version_ | 1867171887717548032 |
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| author | Franke, Steven Wolovick, Michael |
| author_facet | Franke, Steven Wolovick, Michael |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_963889 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Locations and thickness of sediment-laden basal ice zones at Jutulstraumen Glacier onset (East Antarctica) Franke, Steven Wolovick, Michael 20197001_002; 20197002_003; 20197002_005; 20197002_007; 20197002_009; 20197002_011; 20197002_012; 20197003_004; 20197003_006; 20197003_008; 20197003_010; 20197004_001; 20197004_003; 20197004_004; 20197005_001; 20197006_001; 20197006_002; 20197006_004; 20197006_006; 20197007_005; AC; Aircraft; Antarctica; basal freeze-on; basal ice; DML_20197001_002; DML_20197002_003; DML_20197002_005; DML_20197002_007; DML_20197002_009; DML_20197002_011; DML_20197002_012; DML_20197003_004; DML_20197003_006; DML_20197003_008; DML_20197003_010; DML_20197004_001; DML_20197004_003; DML_20197004_004; DML_20197005_001; DML_20197006_001; DML_20197006_002; DML_20197006_004; DML_20197006_006; DML_20197007_005; Event label; High backscatter zone, thickness; JuRaS, CHIRP; Jutulstraumen; LATITUDE; LONGITUDE; P6_215_UWB_2018_1812220301; P6_215_UWB_2018_1812260501; P6_215_UWB_2018_1812260602; P6_215_UWB_2018_1812270701; P6_215_UWB_2018_1812270802; P6_215_UWB_2018_1812300901; P6-215_UWB_2018; POLAR 6; Profile ID; radio-echo sounding; Radio-echo sounding; RES; Season; Subglacial sediments; Trace Number 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. |
| title | Locations and thickness of sediment-laden basal ice zones at Jutulstraumen Glacier onset (East Antarctica) |
| topic | 20197001_002; 20197002_003; 20197002_005; 20197002_007; 20197002_009; 20197002_011; 20197002_012; 20197003_004; 20197003_006; 20197003_008; 20197003_010; 20197004_001; 20197004_003; 20197004_004; 20197005_001; 20197006_001; 20197006_002; 20197006_004; 20197006_006; 20197007_005; AC; Aircraft; Antarctica; basal freeze-on; basal ice; DML_20197001_002; DML_20197002_003; DML_20197002_005; DML_20197002_007; DML_20197002_009; DML_20197002_011; DML_20197002_012; DML_20197003_004; DML_20197003_006; DML_20197003_008; DML_20197003_010; DML_20197004_001; DML_20197004_003; DML_20197004_004; DML_20197005_001; DML_20197006_001; DML_20197006_002; DML_20197006_004; DML_20197006_006; DML_20197007_005; Event label; High backscatter zone, thickness; JuRaS, CHIRP; Jutulstraumen; LATITUDE; LONGITUDE; P6_215_UWB_2018_1812220301; P6_215_UWB_2018_1812260501; P6_215_UWB_2018_1812260602; P6_215_UWB_2018_1812270701; P6_215_UWB_2018_1812270802; P6_215_UWB_2018_1812300901; P6-215_UWB_2018; POLAR 6; Profile ID; radio-echo sounding; Radio-echo sounding; RES; Season; Subglacial sediments; Trace Number |
| url | https://doi.org/10.1594/PANGAEA.963889 |