Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets

Marianne Haseloff, Olga V. Sergienko

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Mass loss from ice shelves is a strong control on grounding-line dynamics. Here we investigate how calving and submarine melt parameterizations affect steady-state grounding-line positions and their stability. Our results indicate that different calving laws with the same melt parameterization result in more diverse steady-state ice-sheet configurations than different melt parameterizations with the same calving law. We show that the backstress at the grounding line depends on the integrated ice-shelf mass flux. Consequently, ice shelves are most sensitive to high melt rates in the vicinity of their grounding lines. For the same shelf-averaged melt rates, different melt parameterizations can lead to very different ice-shelf configurations and grounding-line positions. If the melt rate depends on the slope of the ice-shelf draft, then the positive feedback between increased melting and steepening of the slope can lead to singular melt rates at the ice-shelf front, producing an apparent lower limit of the shelf front thickness as the ice thickness vanishes over a small boundary layer. Our results illustrate that the evolution of marine ice sheets is highly dependent on ice-shelf mass loss mechanisms, and that existing parameterizations can lead to a wide range of modelled grounding-line behaviours.

Original languageEnglish (US)
Pages (from-to)1149-1166
Number of pages18
JournalJournal of Glaciology
Issue number272
StatePublished - Dec 23 2022

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes


  • Calving
  • ice dynamics
  • ice shelves
  • ice-sheet modelling
  • ice/ocean interactions


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