Preprints
https://doi.org/10.5194/essd-2021-91
https://doi.org/10.5194/essd-2021-91

  06 Apr 2021

06 Apr 2021

Review status: this preprint is currently under review for the journal ESSD.

Airborne ultra-wideband radar sounding over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream

Steven Franke1, Daniela Jansen1, Tobias Binder1,a, John D. Paden2, Nils Dörr3, Tamara Gerber4, Heinrich Miller1, Dorthe Dahl-Jensen4, Veit Helm1, Daniel Steinhage1, Ilka Weikusat1,5, Frank Wilhelms1,6, and Olaf Eisen1,7 Steven Franke et al.
  • 1Alfred Wegener Institute, Helmholz Centre for Polar and Marine Sciences, Bremerhaven, Germany
  • 2Centre for Remote Sensing of Ice Sheets (CReSIS), University of Kansas, Lawrence, KS, USA
  • 3Institute of Photogrammetry and Remote Sensing, Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 4Physics of Ice, Climate, and Earth, Niels Bohr Institute, University of Copenhagen, Denmark
  • 5Department of Geosciences, Eberhard Karls University Tübingen, Germany
  • 6Department of Crystallography, Geoscience Centre, University of Göttingen, Germany
  • 7Department of Geosciences, University of Bremen, Bremen, Germany
  • anow at: Ibeo Automotive Systems, Hamburg, Germany

Abstract. 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 were acquired in May 2018 with Alfred Wegener Institute’s multichannel ultra-wideband (UWB) radar mounted on the Polar6 aircraft. Radar profiles cover an area of ~24000 km2 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 was designed to: (i) map the stratigraphic signature of the shear margins with radar profiles aligned perpendicular to ice flow, (ii) trace the radar stratigraphy along several flow lines and (iii) provide spatial coverage of ice thickness and basal properties. While we are able to resolve radar reflections in the deep stratigraphy, we can not 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 understand the past and future dynamics of the NEGIS. The EGRIP-NOR-2018 radar data products can be obtained at the PANGAEA Data Publisher (https://doi.pangaea.de/10.1594/PANGAEA.928569; Franke et al. 2021a).

Steven Franke et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-91', Anonymous Referee #1, 27 May 2021
    • AC1: 'Reply on RC1', Steven Franke, 07 Sep 2021
  • RC2: 'Comment on essd-2021-91', Anonymous Referee #2, 07 Jun 2021
    • AC2: 'Reply on RC2', Steven Franke, 07 Sep 2021

Steven Franke et al.

Data sets

Ultra-wideband radar data over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream (NEGIS) Franke, S., Jansen, D., Binder, T., Paden, J. D., Dörr, N., Gerber, T., Miller, H., Dahl-Jensen, D., Helm, V., Steinhage, D., Weikusat, I., Wilhelms, F., Eisen, O. https://doi.pangaea.de/10.1594/PANGAEA.928569

Steven Franke et al.

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Short summary
The Northeast Greenland Ice Stream (NEGIS) is the largest ice stream in Greenland. In order to better understand the past and future dynamics of the NEGIS, we present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the NEGIS. The survey area is centred at the location of the drill site of the East Greenland Ice-Core Project (EastGRIP) and radar profiles cover both shear margins and are aligned parallel to several flow lines.