TY - JOUR
T1 - Glaciohydraulic supercooling
T2 - A freeze-on mechanism to create stratified, debris-rich basal ice: I. Field evidence
AU - Lawson, Daniel E.
AU - Strasser, Jeffrey C.
AU - Evenson, Edward B.
AU - Alley, Richard B.
AU - Larson, Grahame J.
AU - Arcone, Steven A.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
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U2 - 10.1017/S0022143000002069
DO - 10.1017/S0022143000002069
M3 - Article
AN - SCOPUS:0032443984
VL - 44
SP - 547
EP - 562
JO - Journal of Glaciology
JF - Journal of Glaciology
SN - 0022-1430
IS - 148
ER -