Feedback mechanisms controlling Antarctic glacial-cycle dynamics simulated with a coupled ice sheet–solid Earth model

Albrecht, Torsten; Bagge, Meike; Klemann, Volker

doi:https://doi.org/10.5194/tc-18-4233-2024

Articles | Volume 18, issue 9

https://doi.org/10.5194/tc-18-4233-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/tc-18-4233-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 9

Research article

|

19 Sep 2024

Research article |

| 19 Sep 2024

Feedback mechanisms controlling Antarctic glacial-cycle dynamics simulated with a coupled ice sheet–solid Earth model

Torsten Albrecht, Meike Bagge, and Volker Klemann

Supplement

https://doi.org/10.5194/tc-18-4233-2024-supplement

Data sets

PISM-VILMA glacial cycle simulations of the Antarctic Ice Sheet coupled to the solid Earth and global sea level Torsten Albrecht et al. https://doi.org/10.1594/PANGAEA.972528

Model code and software

Parallel Ice Sheet Model (PISM) (v2.1) C. Khrulev et al. https://doi.org/10.5281/zenodo.10202029

Video supplement

Simulation of the relative sea level change rate around Antarctica with PISM-VILMA over the last 25 kyr Torsten Albrecht https://doi.org/10.5446/65479

Simulations of the relative sea level change along transect through Ronne Ice Shelf, Antarctica Torsten Albrecht et al. https://doi.org/10.5446/68302

Short summary

We performed coupled ice sheet–solid Earth simulations and discovered a positive (forebulge) feedback mechanism for advancing grounding lines, supporting a larger West Antarctic Ice Sheet during the Last Glacial Maximum. During deglaciation we found that the stabilizing glacial isostatic adjustment feedback dominates grounding-line retreat in the Ross Sea, with a weak Earth structure. This may have consequences for present and future ice sheet stability and potential rates of sea-level rise.