Crevasses triggered on Pine Island Glacier, West Antarctica, by drilling through an exceptional melt layer

Julian B.T. Scott, Andrew M. Smith, Robert G. Bingham, David G. Vaughan

Research output: Contribution to journalArticle

8 Citations (Scopus)
3 Downloads (Pure)

Abstract

The basic theory of crevasse formation suggests that crevasses initiate at or near the surface. However, due to variations in stress with depth, it has been suggested that it is possible for crevasses to initiate at depths of 10–30 m. From December 2006 to January 2007, hot-water drilling on Pine Island Glacier, West Antarctica, was found to trigger crevasses. Satellite imagery and field investigations in 2008, including ice cores, radar and GPS, revealed that these formed a new band of arcuate (curvilinear) crevasses around 70km long and 100m deep. This new band is located 10km upstream from the previous limit of the arcuate crevasse zone. The crevasses were triggered on drilling through an exceptional ice layer at >20m depth. Ice layers within the firn will change both the strength and stress intensity. As the firn changes spatially and temporally (e.g. with the burial of an ice layer), it is possible for the position of crevasse initiation to change whilst the along-stream strain-rate profile remains constant. However, the main cause of an upstream migration of the arcuate crevasse zone on Pine Island Glacier is still likely to be an increase in strain rate.
Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalAnnals of Glaciology
Volume51
Issue number55
DOIs
Publication statusPublished - Jun 2010

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crevasse
glacier
drilling
melt
firn
ice
strain rate
Antarctica
ice core
satellite imagery
GPS
radar

Keywords

  • glaciology
  • cryosphere
  • Antarctica
  • ice dynamics
  • crevasses

Cite this

Crevasses triggered on Pine Island Glacier, West Antarctica, by drilling through an exceptional melt layer. / Scott, Julian B.T.; Smith, Andrew M.; Bingham, Robert G.; Vaughan, David G.

In: Annals of Glaciology, Vol. 51, No. 55, 06.2010, p. 65-70.

Research output: Contribution to journalArticle

Scott, Julian B.T. ; Smith, Andrew M. ; Bingham, Robert G. ; Vaughan, David G. / Crevasses triggered on Pine Island Glacier, West Antarctica, by drilling through an exceptional melt layer. In: Annals of Glaciology. 2010 ; Vol. 51, No. 55. pp. 65-70.
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