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Ultra-wideband radar data over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream (NEGIS) (2021)

Franke, Steven ; Jansen, Daniela ; Binder, Tobias ; [et al.]

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Publication Date: 2024-05-17

Description: We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the Northeast Greenland Ice Stream (NEGIS). The radar data has been acquired in May 2018 with the Alfred Wegener Institute (AWI) multichannel ultra-wideband radar mounted on the Polar6 aircraft. Radar profiles cover an area of ~24 000 km^2 and extend over the well-defined shear margins of the NEGIS. The survey area is centred at the location of the drill site of the East Greenland Ice-Core Project (EastGRIP) and several radar lines intersect at this location. The survey layout is designed to (1) map the stratigraphic signature of the shear margins with radar profiles aligned perpendicular to ice flow and (2) trace the radar stratigraphy along several flow lines. While we are able to resolve radar reflections in the deep stratigraphy, we cannot fully resolve the steeply inclined reflections at the tightly folded shear margins in the lower part of the ice column. The NEGIS is causing the most significant discrepancies between numerically modelled and observed ice surface velocities. Given the high likelihood of future climate and ocean warming, this extensive data set of new high-resolution radar data in combination with the EastGRIP ice core will be a key contribution to understanding the past and future dynamics of the NEGIS.

Keywords: AWI UWB; Binary Object; EGRIP-NOR; EGRIP-NOR-18; File name; Ice dynamics; MULT; Multiple investigations; North East Greenland Ice Stream (NEGIS); P6-211_EGRIP_NOR_2018; POLAR 6; radio echo sounding; RES; shear margins

Type: Dataset

Format: text/tab-separated-values, 90 data points

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NC Greenland NG1: Three-dimensional stratigraphic Horizon in the Northern Central Greenland ice sheet (13.8 ka) (2023)

Franke, Steven ; Bons, Paul D ; Streng, Kyra ; [et al.]

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Publication Date: 2024-04-20

Description: The NG1 3D horizon is located in northern central Greenland and covers an area of approximately 690 x 55 km and reaches almost from the eastern to the western outlet systems. The age of NG1 is 13.8 ± 1.0 ka (thousand years). NG1 extends in the east into the NEGIS trunk and shows in this area similar short-wavelength folds, which are observed in the NEGIS shear margins. Furthermore, NG1 resembles several cylindrical upright folds in the eastern and western edges of the horizons. The fold axes of the cylindrical folds in the west trend approximately west, whereas the trend of the cylindrical folds in the east trend north. In the central-eastern area, we find a large bump in the bed topography due to the paleofluvial mega-canyon, which is imprinted in the 3D horizons mimicking this bed depression. In the central-west, we find cylindrical upright folds trending in two different directions (north and north-west).

Keywords: Airborne radio-echo sounding; ARES; Binary Object; Binary Object (File Size); Binary Object (Media Type); File content; File type; ice flow; ice sheets; ice stream; IRH; NorthernCentralGreenland; Polar 6; radio-echo sounding

Type: Dataset

Format: text/tab-separated-values, 18 data points

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NC Greenland NG2: Three-dimensional stratigraphic Horizon in the Northern Central Greenland ice sheet (37.5 ka) (2023)

Franke, Steven ; Bons, Paul D ; Streng, Kyra ; [et al.]

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Publication Date: 2024-04-20

Description: The NG2 3D horizon is located in northern central Greenland and covers an area of approximately 690 x 55 km and reaches almost from the eastern to the western outlet systems. The age of NG2 is 37.5 ± 2.1 ka (thousand years). NG2 extends in the east into the NEGIS trunk and shows in this area similar short-wavelength folds, which are observed in the NEGIS shear margins. Furthermore, NG2 resembles several cylindrical upright folds in the eastern and western edges of the horizons. The fold axes of the cylindrical folds in the west trend approximately west, whereas the trend of the cylindrical folds in the east trend north. In the central-eastern area, we find a large bump in the bed topography due to the paleofluvial mega-canyon, which is imprinted in the 3D horizons mimicking this bed depression. In the central-west, we find cylindrical upright folds trending in two different directions (north and north-west).

Type: Dataset

Format: text/tab-separated-values, 18 data points

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