Static grounding lines and dynamic ice streams: Evidence from the Siple Coast, West Antarctica

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Grounding line dynamics are key to our understanding of marine ice sheets such as the West Antarctic Ice Sheet (WAIS). We present an accurate and rapid method for locating grounding lines using GLAS ICESat laser altimetry data. We then apply this technique to the Siple Coast region of the WAIS. Our technique exploits the high surface slope at the grounding line relative to the adjacent flat ice streams and ice shelf. The technique is validated by ground-based observations. Comparisons between the current grounding line and earlier measured locations demonstrate that the Siple Coast's grounding line has been largely static over the last two decades. This is important as the ice streams have been undergoing considerable variations over this period. We conclude that ice stream flow speeds can vary while the grounding line remains stable. We suggest that grounding lines may migrate abruptly and then stabilize rather than undergoing continuous retreat.

Original languageEnglish (US)
Article numberL18502
JournalGeophysical Research Letters
Volume33
Issue number18
DOIs
StatePublished - Sep 28 2006

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grounding line
ice stream
Antarctic regions
coasts
ice
coast
ice sheet
Ice, Cloud and Land Elevation Satellite
land ice
altimetry
ICESat
shelves
ice flow
ice shelf
Antarctica
streamflow
slopes
laser
lasers

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

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abstract = "Grounding line dynamics are key to our understanding of marine ice sheets such as the West Antarctic Ice Sheet (WAIS). We present an accurate and rapid method for locating grounding lines using GLAS ICESat laser altimetry data. We then apply this technique to the Siple Coast region of the WAIS. Our technique exploits the high surface slope at the grounding line relative to the adjacent flat ice streams and ice shelf. The technique is validated by ground-based observations. Comparisons between the current grounding line and earlier measured locations demonstrate that the Siple Coast's grounding line has been largely static over the last two decades. This is important as the ice streams have been undergoing considerable variations over this period. We conclude that ice stream flow speeds can vary while the grounding line remains stable. We suggest that grounding lines may migrate abruptly and then stabilize rather than undergoing continuous retreat.",
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Static grounding lines and dynamic ice streams : Evidence from the Siple Coast, West Antarctica. / Horgan, H. J.; Anandakrishnan, Sridhar.

In: Geophysical Research Letters, Vol. 33, No. 18, L18502, 28.09.2006.

Research output: Contribution to journalArticle

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