Detail InformationEdit
Rutford Ice Stream is a major Antarctic ice stream, about 180 miles long and over 15 miles wide, which drains southeastward between the Sentinel Range, Ellsworth Mountains and Fletcher Ice Rise into the southwest part of Ronne Ice Shelf. Named by US-ACAN for geologist Robert Hoxie Rutford, a member of several USARP expeditions to Antarctica; leader of the University of Minnesota Ellsworth Mountains Party, 1963-1964. Rutford served as Director of the Division of Polar Programs, National Science Foundation, 1975-1977.
The ice stream is situated in a deep trough which is a tectonic feature between the Ellsworth Mountains and the Fletcher Promontory. Because of this the ice stream position may have been stable for millions of years. The bed of the ice stream reaches 2000 m below sea level. Therefore between the bed of the ice stream and the height of the Ellsworth Mountains there is a vertical relief of 7 km over a distance of only 40 km.
At the upper (inland) end of the ice stream the ice thickness reaches 3100 m falling to around 2300 m in the trough. Flow speed reaches a maximum of around 400 metres per year about 40 km inland from where the ice stream meets the Ronne Ice Shelf and starts to float on the sea.The Rutford ice stream varies its speed by as much as 20% every two weeks, in response to variations in the tides.
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