Precise measurement of changes in ice‐shelf thickness by phase‐sensitive radar to determine basal melt rates
Precise measurement of changes in ice‐shelf thickness by phase‐sensitive radar to determine basal melt rates
复制标题
通过相敏雷达精确测量冰架厚度的变化以确定基础融化速率
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
C. Doake
中科院分区：
文献类型：
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作者：
H. Corr;A. Jenkins;K. Nicholls;C. Doake
我们描述了一种新的技术，用于测量在冰架上的一个点的基础融化速率。该方法使用相敏雷达来观测上参考水平线和冰架底部之间冰柱厚度的变化。观测到的厚度变化是基底融化，水平冰的发散和积雪压实的组合。后两个组成部分是通过对表面标志物的重复测量以及对参考层位深度处的表面累积速率和密度的估计来独立确定的。该技术已应用于南极洲乔治六世冰架的一个地点，在那里观测到12天内的融化速率为2.78 ± 0.08 m/年。我们的技术适用于几乎任何冰架或浮动冰舌，其在短时间间隔内的高精度将允许测量融化速率的季节性变化。
We describe a novel technique for measuring the basal melt rate at a point on an ice shelf. The method uses a phase‐sensitive radar to observe the change in thickness of the ice column between an upper reference horizon and the ice shelf base. The observed thickness change is a combination of basal melting, horizontal ice divergence and firn compaction. The latter two components are determined independently by the repeat survey of surface markers and from estimates of surface accumulation rate and density at the depth of the reference horizon. The technique has been applied at a site on George VI Ice Shelf, Antarctica, where a melt rate of 2.78 ± 0.08 m yr−1 was observed over a twelve‐day period. Our technique is applicable to almost any ice shelf or floating glacier tongue, and its high precision over short time intervals will permit the measurement of seasonal variations in melt rate.