Mass balance reassessment of glaciers draining into the Abbot and Getz Ice Shelves of West Antarctica

Stephen Chuter, Jonathan Bamber, Alba Martin Espanol, Bert Wouters

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)
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Abstract

We present a reassessment of input-output method (IOM) ice mass budget estimates for the Abbot and Getz regions of West Antarctica using CryoSat-2 derived ice thickness estimates. The mass budget is 8 ± 6 Gt yr-1 and 5 ± 17 Gt yr-1 for the Abbot and Getz sectors respectively for the period 2006-2008. Over the Abbot region, our results resolve a previous discrepancy with elevation rates from altimetry, due to a previous 30% overestimation of ice thickness. For the Getz sector, our results are at the more positive bound of estimates from other techniques. Grounding line velocity increases up to 20% between 2007-2014 alongside mean elevation rates of -0.67 ± 0.13 m yr-1 between 2010-2013 indicate the onset of a dynamic thinning signal. Mean snowfall trends of -0.33 m yr-1 -0.80 m yr-1water equivalent since 2006 indicate recent mass trends are driven by both ice dynamics and surface processes.
Original languageEnglish
Number of pages10
JournalGeophysical Research Letters
Early online date19 Jul 2017
DOIs
Publication statusE-pub ahead of print - 19 Jul 2017

Keywords

  • Antarctica
  • mass balance
  • CryoSat-2
  • ice shelves
  • cryosphere

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