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Instruments and Methods Estimates of the refreezing rate in an ice-shelf borehole

机译：仪器和方法在冰架钻孔中重新冻结速度的估算

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摘要

The refreezing rate of a borehole drilled through a 252 m thick region of the Ross Ice Shelf, Antarctica, is determined using océanographic measurements over two periods of a day. We first use a method based on the conservation of salt in the supercooled salt water of the borehole. This is compared to a model using a numerical solution of the heat equation to find the temperature distribution in the host ice, allowing ice growth to be calculated from the balance of heat fluxes at the ice/water interface. This second method broadly confirms the refreezing rates deduced from salinity measurements, giving confidence in the generalization of this simple heat-flux model to predict refreezing rates of other boreholes. Predictions from both are subject to uncertainty due to the poorly defined value of the solid fraction of ice that freezes in a supercooled volume of sea water. This is taken to be 0.5 ± 0.1 throughout this study. The predicted rates are also strongly dependent on the initial and boundary conditions chosen, but results show the initial diameter of 600 mm decreases at a rate of ~3-5 mm h~(-1) in an ice shelf with a minimum temperature of -22°C.
机译：在一天的两个时段内，使用海洋学测量来确定在南极罗斯冰架的252 m厚区域中钻出的钻孔的重新冻结速率。我们首先使用一种基于井眼过冷盐水中盐分守恒的方法。将其与使用热方程数值解的模型进行比较，以找到宿主冰中的温度分布，从而可以根据冰/水界面处的热通量平衡来计算冰的生长。第二种方法广泛地证实了由盐度测量得出的再冻结速率，从而使人们对这种简单的热通量模型的普遍性具有信心，可以预测其他井眼的再冻结速率。由于在冰冷的海水中冻结的冰的固体成分的定义不明确，因此两者的预测都存在不确定性。在整个研究过程中，该值为0.5±0.1。预测的速率也强烈依赖于所选的初始条件和边界条件，但是结果表明，在最低温度为-的冰架上，初始直径600 mm以〜3-5 mm h〜（-1）的速率减小。 22℃。

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