Topographic Shelf Waves Control Seasonal Melting Near Antarctic Ice Shelf Grounding Lines

Sainan Sun*, Tore Hattermann, Frank Pattyn, Keith W. Nicholls, Reinhard Drews, Sophie Berger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The buttressing potential of ice shelves is modulated by changes in subshelf melting, in response to changing ocean conditions. We analyze the temporal variability in subshelf melting using an autonomous phase-sensitive radio-echo sounder near the grounding line of the Roi Baudouin Ice Shelf in East Antarctica. When combined with additional oceanographic evidence of seasonal variations in the stratification and the amplification of diurnal tides around the shelf break topography (Gunnerus Bank), the results suggest an intricate mechanism in which topographic waves control the seasonal melt rate variability near the grounding line. This mechanism has not been considered before and has the potential to enhance local melt rates without advecting different water masses. As topographic waves seem to strengthen in a stratified ocean, the freshening of Antarctic surface water, predicted by observations and models, is likely to increase future basal melting in this area.

Original languageEnglish
Pages (from-to)9824-9832
Number of pages9
JournalGeophysical Research Letters
Volume46
Issue number16
DOIs
Publication statusPublished - 28 Aug 2019
Externally publishedYes

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