Evolution of ice-shelf channels in Antarctic ice shelves
Evolution of ice-shelf channels in Antarctic ice shelves
复制标题
南极冰架冰架通道的演化
DOI：
10.5194/tc-9-1169-2015
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Drews
中科院分区：
文献类型：
--
作者：
R. Drews
抽象的。冰架支撑着大陆冰通量并调节冰-海相互作用。它们经常被底部融化增强的通道穿过，影响冰架的稳定性。在这里，通道演变的研究使用瞬态，三维全斯托克斯模型和地球物理数据收集的罗伊博杜安冰架（RBIS），南极洲。模拟证实了基底融化作为通道创建的可行机制，尽管通道也可能平流而不融化数十公里。通道可以根据其宽度和上游熔融历史而脱离流体静力平衡。在这些地区，利用流体静力学平衡来反演冰厚的表面高程是错误的，在RBIS，通过将流体静力学反演的冰厚与雷达测量结果进行比较，提出了相应的观测证据。该模型表明，渠道化融化的流场特征，这可能会导致加强跨渠道的水平剪切。这是一个例子，在RBIS使用观测到的表面速度的通道，并开辟了可能性，从空间分类通道化融化，将这些影响在冰海洋模型的重要一步。
Abstract. Ice shelves buttress the continental ice flux and mediate ice–ocean interactions. They are often traversed by channels in which basal melting is enhanced, impacting ice-shelf stability. Here, channel evolution is investigated using a transient, three-dimensional full Stokes model and geophysical data collected on the Roi Baudouin Ice Shelf (RBIS), Antarctica. The modeling confirms basal melting as a feasible mechanism for channel creation, although channels may also advect without melting for many tens of kilometers. Channels can be out of hydrostatic equilibrium depending on their width and the upstream melt history. Inverting surface elevation for ice thickness using hydrostatic equilibrium in those areas is erroneous, and corresponding observational evidence is presented at RBIS by comparing the hydrostatically inverted ice thickness with radar measurements. The model shows that channelized melting imprints the flow field characteristically, which can result in enhanced horizontal shearing across channels. This is exemplified for a channel at RBIS using observed surface velocities and opens up the possibility to classify channelized melting from space, an important step towards incorporating these effects in ice–ocean models.
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