Preprints
https://doi.org/10.5194/gmd-2023-8
https://doi.org/10.5194/gmd-2023-8
Submitted as: model description paper
 | 
17 Mar 2023
Submitted as: model description paper |  | 17 Mar 2023
Status: this preprint was under review for the journal GMD but the revision was not accepted.

Quantitative Sub-Ice and Marine Tracing of Antarctic Sediment Provenance (TASP v0.1)

James W. Marschalek, Edward Gasson, Tina van de Flierdt, Claus-Dieter Hillenbrand, Martin J. Siegert, and Liam Holder

Abstract. Ice sheet models must be able to accurately simulate palaeo ice sheets to have confidence in their predictions of future Antarctic ice mass loss and resulting global sea-level rise, particularly over longer timescales. This requires accurate reconstructions of the extent and flow patterns of palaeo ice sheets using real-world data. Such reconstructions can be achieved by tracing the detrital components of offshore sedimentary records back to their source areas on land. However, sediment provenance data and ice sheet model results have not been directly linked, despite the complimentary information each can provide the other. Here, we present a computational framework (Tracing Antarctic Sediment Provenance, TASP) that predicts marine geochemical sediment provenance data using the output of numerical ice sheet modelling. The ice sheet model is used to estimate the spatial pattern of erosion rates and to trace ice flow pathways. Beyond the ice sheet margin, simple approximations of modern detrital particle transport mechanisms using ocean reanalysis data produce a good agreement between our predictions for the modern ice sheet/ocean system and marine surface sediments. Comparing results for the modern system to seafloor surface sediment measurements will allow application of the method to past ice sheet configurations. TASP currently predicts neodymium isotope compositions using the PSUICE3D ice sheet model, but it has been designed so that it could be adapted to predict other provenance indicators or use outputs of other ice sheet models.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
James W. Marschalek, Edward Gasson, Tina van de Flierdt, Claus-Dieter Hillenbrand, Martin J. Siegert, and Liam Holder

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2023-8', Juan Antonio Añel, 05 May 2023
    • AC1: 'Reply on CEC1', Jim Marschalek, 16 May 2023
      • CEC2: 'Reply on AC1', Juan Antonio Añel, 16 May 2023
        • AC2: 'Reply on CEC2', Jim Marschalek, 25 May 2023
  • RC1: 'Comment on gmd-2023-8', Anonymous Referee #1, 19 May 2023
    • AC3: 'Reply on RC1', Jim Marschalek, 05 Jul 2023
  • RC2: 'Comment on gmd-2023-8', Evan Gowan, 29 May 2023
    • AC4: 'Reply on RC2', Jim Marschalek, 05 Jul 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2023-8', Juan Antonio Añel, 05 May 2023
    • AC1: 'Reply on CEC1', Jim Marschalek, 16 May 2023
      • CEC2: 'Reply on AC1', Juan Antonio Añel, 16 May 2023
        • AC2: 'Reply on CEC2', Jim Marschalek, 25 May 2023
  • RC1: 'Comment on gmd-2023-8', Anonymous Referee #1, 19 May 2023
    • AC3: 'Reply on RC1', Jim Marschalek, 05 Jul 2023
  • RC2: 'Comment on gmd-2023-8', Evan Gowan, 29 May 2023
    • AC4: 'Reply on RC2', Jim Marschalek, 05 Jul 2023
James W. Marschalek, Edward Gasson, Tina van de Flierdt, Claus-Dieter Hillenbrand, Martin J. Siegert, and Liam Holder

Data sets

Surface sediment Nd isotope compositions from the Ross Sea, Antarctica Liam Holder and James Marschalek https://doi.org/10.5281/zenodo.7548284

Model code and software

Tracing Antarctic Sediment Provenance (TASP) James Marschalek https://doi.org/10.5281/zenodo.7529996

James W. Marschalek, Edward Gasson, Tina van de Flierdt, Claus-Dieter Hillenbrand, Martin J. Siegert, and Liam Holder

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Short summary
Ice sheet models can help predict how Antarctica’s ice sheets respond to environmental change; such models benefit from comparison to geological data. Here, we use ice sheet model results, plus other data, to predict the erosion of Antarctic debris and trace its transport to where it is deposited on the ocean floor. This allows the results of ice sheet modelling to be directly and quantitively compared to real-world data, helping to reduce uncertainty regarding Antarctic sea level contribution.