Preprints
https://doi.org/10.5194/tc-2022-23
https://doi.org/10.5194/tc-2022-23
 
22 Mar 2022
22 Mar 2022
Status: this preprint is currently under review for the journal TC.

Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling

Vjeran Višnjević1, Reinhard Drews1, Clemens Schannwell2, Inka Koch1, Steven Franke3, Daniela Jansen3, and Olaf Eisen3,4 Vjeran Višnjević et al.
  • 1Department for Geoscience, University of Tübingen, Tübingen, Germany
  • 2Max Planck Institute for Meteorology, Hamburg, Germany
  • 3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 4University of Bremen, Bremen, Germany

Abstract. Ice shelves surrounding the Antarctic perimeter decelerate ice discharge towards the ocean through buttressing. Ice-shelf evolution and integrity depend on the local surface accumulation, basal melting and on the spatially variable ice-shelf viscosity. These parameters are often poorly constrained by observations and introduce uncertainties in ice-sheet projections for the ice-sheet evolution. Isochronal radar stratigraphy is an observational archive for the atmospheric, oceanographic and ice-flow history of ice shelves with potential to assist model calibration. Here, we explore the possibility of using a simple and observationally driven ice-flow forward model to predict the ice-shelf stratigraphy for a given atmospheric- and oceanographic scenario. We validate this approach with the full Stokes ice-flow model Elmer/Ice and present a test case for the Roi Baudouin Ice Shelf (East Antarctica), where we compare model predictions with radar observations. The presented method enables us to investigate whether ice shelves are in steady-state and to delineate how much of the ice-shelf volume is determined by its local surface accumulation. This can be used to better understand variability in ice-shelf rheology and for estimations which ice shelves are particularly susceptible to changes of surface accumulation rates in the future. Moreover, the numerically efficient prediction of isochronal stratigraphy is a step forward towards integrating radar data into ice-flow models using inverse methods. This has potential to constrain ocean-induced melting beneath Antarctic ice shelves using the ever-growing archive of radar observations of internal ice stratigraphy.

Vjeran Višnjević 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 tc-2022-23', Johannes Sutter, 23 Apr 2022
  • RC2: 'Comment on tc-2022-23', Anonymous Referee #2, 02 May 2022

Vjeran Višnjević et al.

Vjeran Višnjević et al.

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Short summary
We present a simple way to model internal layers of an ice shelf, and apply the method to the Roi Baudouin Ice Shelf in East Antarctica. Modelled results are compared to the measurements obtained by radar. We distinguish between ice directly formed on the shelf and ice transported from the ice sheet, and map the spatial changes in the volume of the locally accumulated ice. In this context, we discuss the sensitivity of the ice shelf to the future changes in surface accumulation and basal melt.