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Extreme sediment and ice discharge from marine-based ice streams: New evidence from the North Sea

¹ Department of Earth Science, University of Bergen, Allegaten 41, N-5007, Bergen, Norway
² Department of Geography, University of Sheffield, Sheffield S10 2TN, UK

A major problem for understanding the dynamics of ice streams has been a lack of precise data on ice streaming longevity and sediment transport efficacy. Here we present the first well-constrained data on sediment flux from a paleoice stream. This has been achieved by computing the volume of sediment deposited as debris flows on the fan located at the outlet of the Norwegian Channel ice stream, and converting to a flux measurement by accounting for the duration of streaming in this episode (between 20 and 19 ka during the last glacial stage). In this period the ice stream delivered an average 1.1 Gt of sediment per year, equivalent to 8000 m³yr^–1 per meter width of ice stream front. The calculated flux is an order of magnitude higher than most previous estimates for other paleoice streams and is comparable to the present sediment flux from the world's largest rivers. The short period of debris-flow deposition suggests that the Norwegian Channel ice stream underwent rapid on-off switching, with punctuated iceberg delivery to the North Atlantic as a consequence.

Key Words: ice stream • sediment flux • sediment transport • ice flow • ice sheet

This article has been cited by other articles:

				J.S. Laberg, R.S. Eilertsen, and T.O. Vorren The paleo-ice stream in Vestfjorden, north Norway, over the last 35 k.y.: Glacial erosion and sediment yield Geological Society of America Bulletin, March 1, 2009; 121(3-4): 434 - 447. [Abstract] [Full Text] [PDF]