Ground-penetrating radar data (50MHz) and internal reflection horizons along the central flowline of Ekström ice shelf, Dronning Maud Land, East Antarctica - netCDF file

The internal stratigraphic structure of ice shelves forms by the interplay of ice dynamics, snow accumulation and basal melt. To infer accumulation and basal melt rates, we acquired a ground-penetrating radar profile (50 MHz; pulseEKKO (R) from Sensors & Software Inc.) along the central flowline...

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Bibliographic Details
Main Authors: Oraschewski, Falk M, Moss, Guy, Koch, Inka, Ershadi, M Reza, Eisen, Olaf, Drews, Reinhard
Format: Dataset
Language:English
Published: PANGAEA 2024
Subjects:
Antarctica
ANT-Land_2022_ReMeltRadar
ANT-Land_2023_ReMeltRadar
Dronning Maud Land
Ekström
flowline
GPR_GVN21-22
GPR_GVN22-23
ground-penetrating radar
Ice shelf
Internal Reflection Horizon
IRH
NEUMAYER III
radar
East Antarctica
Neumayer
Ekström Ice Shelf
Antarc*
Ice Shelf
Ice Shelves
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.965141
https://doi.org/10.1594/PANGAEA.965141
Description
Summary:The internal stratigraphic structure of ice shelves forms by the interplay of ice dynamics, snow accumulation and basal melt. To infer accumulation and basal melt rates, we acquired a ground-penetrating radar profile (50 MHz; pulseEKKO (R) from Sensors & Software Inc.) along the central flowline of Ekström ice shelf, Droning Maud Land, East Antarctica. The data were collected in the two consecutive field seasons 2021/22 and 2022/23 with logistic support from Neumayer III station (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 2016). The profile starts about 5 km upstream of the grounding line and ends at a distance of 10 km to the ice shelf front, giving a total length of 129.3 km. Radar processing with ImpDAR (Lilien et al., 2020) encompassed trace averaging to equidistant spacing (10 m) and bandpass filtering (cut-off frequencies of 20 and 75 MHz). In addition, the REMA surface elevation (Howat et al., 2019) and the ice-ocean interface from BedMachine (Morlighem et al., 2017) were obtained along the profile line. The segments from both field seasons were connected without adjustments, because the vertical offset between IRHs is much smaller than the radar system's wavelength in ice (~3.4 m). The data shows the ice-ocean interface and continuous internal reflection horizons (IRHs) down to approximately 200 m depth. 4 IRHs were traced along the (nearly) entire length of the profile using a semi-automatic maximum tracking scheme (Koch et al., 2023).

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