Anisotropic Flow, Depth-age Relationships and Stratigraphic Disturbances in Polar Sheets: Collaborative Research by the Universities of Washington and Colorado

该奖项支持一个合作项目，将冰川学和构造地质学结合起来，解决两个相关的跨学科问题。该项目将调查已知在各向异性岩石中运作的地质机制，这些岩石也可能在极地冰中产生地层破坏。将利用线性化和摄动方法，建立一系列分析和半分析模型，以探索极地冰盖的折叠、扭曲、织物条纹和剪切带的条件和开始。一个基本目标是获得一种新的能力，以估计在各种环境下冰芯未受扰动冰的最大深度。极地冰的体积各向异性也将被纳入一个新的有限元动态冰流模型。一个目标是将层破坏过程模型扩展到大应变。该模型还将用于改进预测的冰芯地点的深度-年龄关系，并对具有强各向异性体积结构的深冰将测量层厚度转换为过去积累速率所需的减薄函数进行改进计算。

This award supports a collaborative program to bring together glaciology and structural geology to tackle two related cross-disciplinary issues. The project will investigate the geological mechanisms known to operate in anisotropic rocks that may also generate stratigraphic disruptions in polar ice. A series of analytical and semi-analytical models to explore conditions for and onset of folding, kinking, fabric striping, and shear banding in polar ice sheets will be developed using linearization and perturbation methods. A fundamental goal is a new ability to estimate the maximum depths of undisturbed ice for ice cores in various settings. The bulk anisotropic properties of polar ice will also be incorporated in a new finite element dynamic ice flow model. One goal is to extend the models of layer disruption processes to large strains. This model will also be used to improve the predicted depth-age relationships for ice core sites, and to produce improved calculations of the thinning functions needed to convert measured layer thicknesses to past accumulation rates for deep ice that has a strongly anisotropic bulk fabric.