Elastic dynamics and tidal migration of grounding lines modify subglacial lubrication and melting
Elastic dynamics and tidal migration of grounding lines modify subglacial lubrication and melting
复制标题
接地线的弹性动力学和潮汐迁移改变了冰下润滑和融化
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Worster
中科院分区：
文献类型：
--
作者：
R. Sayag;M. Worster
我们将冰、床和海洋的动力学结合在一个新的弹性模型中，用于变形地基上接地线的潮汐-时间尺度迁移。以前使用固定接地线的弹性冰架模型对潮汐弯曲的解释是不一致的，这表明冰的弹性在空间和时间上都有变化，而且明显小于实验测量。我们在此认为，通过我们的模型，可以做出一致的、纯弹性的解释。将这种新方法与遥感测量相结合，我们表明，在潮汐周期中，接地线迁移了几公里，我们可以推断床的有效弹性特性，并且冰的弹性压力导致接地线附近的水文屏障，控制着冰下水文。研究结果表明，在涨潮期间，由海洋热强迫引起的冰下润滑和融化会显著增加。
We combine the dynamics of ice, bed, and ocean in a new elastic model for the tidal‐timescale migration of grounding lines on deformable foundations. Previous interpretations of tidal flexure using models of elastic ice shelves with fixed grounding lines were found to be inconsistent, suggesting an elasticity of ice that varies spatially and temporally and that is significantly smaller than measured experimentally. We argue here that with our model, a consistent, purely elastic interpretation can be made. Combining this new approach with remote‐sensing measurements, we show that the grounding line migrates several kilometers during a tidal cycle, that we can infer the effective elastic properties of the bed, and that the elastic pressure of the ice leads to a hydrological barrier near the grounding line that controls subglacial hydrology. Our findings imply that subglacial lubrication and melting induced by the ocean thermal forcing can increase substantially during high tide.