Constraining past accumulation in the central Pine Island Glacier basin, West Antarctica, using radio-echo sounding

Nanna B. Karlsson, Robert G. Bingham, David M. Rippin, Richard C.A. Hindmarsh, Hugh F.J. Corr, David G. Vaughan

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

The potential for future dynamical instability of Pine Island Glacier, West Antarctica, has been addressed in a number of studies, but information on its past remains limited. In this study we use airborne radio-echo sounding (RES) data acquired over Pine Island Glacier to investigate past variations in accumulation pattern. In the dataset a distinctive pattern of layers was identified in the central part of the glacier basin.We use these layers as chronological identifiers in order to construct elevation maps of the internal stratigraphy. The observed internal layer stratigraphy is then compared to calculated stratigraphy from a three-dimensional ice-flow model that has been forced with different accumulation scenarios. The model results indicate that the accumulation pattern is likely to have changed at least twice since the deposition of the deepest identified layer. Additional RES data linked to the Byrd ice core provide an approximate timescale. This timescale suggests that the layers were deposited at thebeginning of or during the Holocene period. Thus the widespread changes occurring in the coastal extent of theWest Antarctic ice sheet at the end of the last glacial period could have been accompanied by changes in accumulation pattern.

Original languageEnglish
Pages (from-to)553-562
Number of pages10
JournalJournal of Glaciology
Volume60
Issue number221
DOIs
Publication statusPublished - 1 Jun 2014
Externally publishedYes

Keywords

  • Antarctic glaciology
  • Ground-penetrating radar
  • Ice-sheet modelling
  • Radio-echo sounding

Programme Area

  • Programme Area 5: Nature and Climate

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