The far reach of ice-shelf thinning in Antarctica

R. Reese, G. H. Gudmundsson, A. Levermann, R. Winkelmann*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Floating ice shelves, which fringe most of Antarctica's coastline, regulate ice flow into the Southern Ocean 1-3 . Their thinning 4-7 or disintegration 8,9 can cause upstream acceleration of grounded ice and raise global sea levels. So far the effect has not been quantified in a comprehensive and spatially explicit manner. Here, using a finite-element model, we diagnose the immediate, continent-wide flux response to different spatial patterns of ice-shelf mass loss. We show that highly localized ice-shelf thinning can reach across the entire shelf and accelerate ice flow in regions far from the initial perturbation. As an example, this 'tele-buttressing' enhances outflow from Bindschadler Ice Stream in response to thinning near Ross Island more than 900 km away. We further find that the integrated flux response across all grounding lines is highly dependent on the location of imposed changes: the strongest response is caused not only near ice streams and ice rises, but also by thinning, for instance, well-within the Filchner-Ronne and Ross Ice Shelves. The most critical regions in all major ice shelves are often located in regions easily accessible to the intrusion of warm ocean waters 10-12, stressing Antarctica's vulnerability to changes in its surrounding ocean.

Original languageEnglish
Pages (from-to)53-57
Number of pages5
JournalNature Climate Change
Volume8
Issue number1
Early online date11 Dec 2017
DOIs
Publication statusPublished - 1 Jan 2018
Externally publishedYes

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