On the formation of large subglacial lakes

Autor:	E. M. Shoemaker
Rok vydání:	1991
Předmět:	geography geography.geographical_feature_category Water storage Deglaciation Subglacial eruption General Earth and Planetary Sciences Structural basin Ice sheet Geomorphology Bay Ponding Geology Subglacial stream
Zdroj:	Canadian Journal of Earth Sciences. 28:1975-1981
ISSN:	1480-3313 0008-4077
DOI:	10.1139/e91-179
Popis:	The role of subglacial water storage beneath continental ice sheets is investigated, primarily for a deformable bed. Subglacial ponding is shown to occur under most regions of warm-based ice sheets, and large subglacial lakes can become established, for example in the Hudson Bay basin. The formation of large lakes depends upon the fact that the ice-surface gradient is reduced once subglacial ponding occurs and upon the feedback between the reduced ice-surface gradient and increased subglacial ponding. Subglacial ponding likely played a large role in determining the ice-sheet topography during late deglaciation and in speeding up the deglaciation process.
Databáze:	OpenAIRE
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