Glaciohydraulic supercooling: A freeze-on mechanism to create stratified, debris-rich basal ice: I. Field evidence

Daniel E. Lawson, Jeffrey C. Strasser, Edward B. Evenson, Richard B. Alley, Grahame J. Larson, Steven A. Arcone

Research output: Contribution to journalArticlepeer-review

145 Scopus citations

Abstract

Debris-laden ice accretes to the base of Matanuska Glacier, Alaska, U.S.A., from water that supercools while flowing in a distributed drainage system up the adverse slope of an overdeepening. Frazil ice grows in the water column and forms aggregates, while other ice grows on the glacier sole or on substrate materials. Sediment is trapped by this growing ice, forming stratified debris-laden basal ice. Growth rates of >0.1 m a-1 of debris-rich basal ice are possible. The large sediment fluxes that this mechanism allows may have implications for interpretation of the widespread deposits from ice that flowed through other overdeepenings, including Heinrich events and the till sheets south of the Laurentian Great Lakes.

Original languageEnglish (US)
Pages (from-to)547-562
Number of pages16
JournalJournal of Glaciology
Volume44
Issue number148
DOIs
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes

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