Increased ice flow in Western Palmer Land linked to ocean melting

Anna Hogg, Andrew Shepherd, Stephen L. Cornford, Kate Briggs, Noel Gourmelen, Jennifer A. Graham, Ian Joughin, Jeremie Mouginot, Thomas Nagler, Antony J. Payne, E. Rignot, Jan Wuite

Research output: Contribution to journalArticlepeer-review

Abstract

A decrease in the mass and volume of Western Palmer Land has raised the prospect that ice speed has increased in this marine-based sector of Antarctica. To assess this possibility, we measure ice velocity over 25 years using satellite imagery and an optimised modelling approach. More than 30 unnamed outlet glaciers drain the 800 km coastline of Western Palmer Land at speeds ranging from 0.5 to 2.5 m/day, interspersed with near-stagnant ice. Between 1992 and 2015, most of the outlet glaciers sped up by 0.2 to 0.3 m/day, leading to a 13 % increase in ice flow and a 15 km3/yr increase in ice discharge across the sector as a whole. Speedup is greatest where glaciers are grounded more than 300 m below sea level, consistent with a loss of buttressing caused by ice shelf thinning in a region of shoaling warm circumpolar water.
Original languageEnglish
JournalGeophysical Research Letters
Early online date13 Apr 2017
DOIs
Publication statusPublished - 2 May 2017

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