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Nature. 2006 Dec 21;444(7122):1063-4.

Fortnightly variations in the flow velocity of Rutford Ice Stream, West Antarctica.

Author information

1
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK. ghg@bas.ac.uk

Abstract

Most of the ice lost from the Antarctic ice sheet passes through a few fast-flowing and highly dynamic ice streams. Quantifying temporal variations in flow in these ice streams, and understanding their causes, is a prerequisite for estimating the potential contribution of the Antarctic ice sheet to global sea-level change. Here I show that surface velocities on a major West Antarctic Ice Stream, Rutford Ice Stream, vary periodically by about 20 per cent every two weeks as a result of tidal forcing. Tidally induced motion on ice streams has previously been thought to be limited to diurnal or even shorter-term variations. The existence of strong fortnightly variations in flow demonstrates the potential pitfalls of using repeated velocity measurements over intervals of days to infer long-term change.

PMID:
17183321
DOI:
10.1038/nature05430

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