Mapping the sensitivity of the Amundsen Sea Embayment to changes in external forcings using Automatic Differentiation

Mathieu Morlighem, Daniel Goldberg, Thiago Dias Dos Santos, Jane Lee, Max Sagebaum

Research output: Contribution to journalArticlepeer-review

Abstract

Thwaites and Pine Island glaciers as well as other ice streams in West Antarctica have been changing dramatically over the past decades. Although changes in ocean conditions are likely the primary driver of these changes, it remains unclear where other processes could cause more mass loss. By employing automatic differentiation and two independent ice sheet models, we construct maps of the sensitivity of the volume above floatation to changes in ocean-induced melt rates, ice rigidity, basal friction, and surface mass balance. We find that changes in basal melt close to the grounding lines and along shear margins have a larger impact on the glaciers' final volume. The glaciers are sensitive to changes in basal friction on regions close to the grounding lines, while changes in ice rigidity has a larger impact along the shear margins of Pine Island. The sensitivity to surface mass balance is uniform over grounded ice.
Original languageEnglish
Article number23
Pages (from-to)e2021GL095440
Number of pages8
JournalGeophysical Research Letters
Volume48
Issue number23
DOIs
Publication statusPublished - 24 Nov 2021

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