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

被引：87

作者：

Gudmundsson, G. Hilmar ^{[1
]}

机构：

[1] British Antarctic Survey, Cambridge CB3 0ET, England

来源：

NATURE | 2006年 / 444卷 / 7122期

基金：

英国自然环境研究理事会;

关键词：

D O I：

10.1038/nature05430

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Most of the ice lost from the Antarctic ice sheet passes through a few fast-flowing and highly dynamic ice streams(1). 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(2,3). 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(4-9). 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.

引用

页码：1063 / 1064

页数：2

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