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Subglacial floods beneath ice sheets.

G W Evatt1, A C Fowler, C D Clark

  • 1Oxford University, Mathematical Institute, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|June 20, 2006
PubMed
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Subglacial floods, also known as jökulhlaups, occur periodically beneath ice sheets. These massive floods can cause severe climate disturbances, posing risks now and in the future.

Area of Science:

  • Glaciology
  • Climate Science
  • Geomorphology

Background:

  • Subglacial floods (jökulhlaups) are documented beneath contemporary glaciers and ice caps.
  • Massive floods from ice-dammed lakes near the Laurentide ice sheet occurred during the last ice age.
  • A subglacial flood from the waning ice sheet may have caused a cooling event ~8000 years ago.

Purpose of the Study:

  • To propose that subglacial lake drainage occurs periodically.
  • To highlight the potential for severe magnitude floods from beneath ice sheets.
  • To suggest these events have caused past climatic disturbances and may impact future climate.

Main Methods:

  • Analysis of documented jökulhlaup events.
  • Modeling of subglacial lake drainage dynamics.

Related Experiment Videos

  • Paleoclimatic data interpretation.

    • Main Results:

    • Subglacial lake drainage is proposed to be time-periodic.
    • These hydraulic eruptions can reach severe magnitudes.
    • Such floods are linked to significant past climatic shifts.

    Conclusions:

    • Periodic drainage of subglacial lakes can lead to severe floods.
    • These events have historically caused major climate disturbances.
    • Understanding these processes is crucial for assessing future climate risks.