Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models?
Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models?
复制标题
对冰流床层状况的地震观测能否帮助约束冰流模型中的参数？
DOI：
10.1002/2017jf004373
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Farrell
中科院分区：
文献类型：
--
作者：
T. Kyrke;G. Gudmundsson;P. Farrell
我们调查地震派生的估计基础声阻抗和基础滑动值从表面到床反演使用斯托克斯冰流模型之间的相关性。使用高分辨率测量沿着几个地震剖面上的松岛冰川（PIG），我们发现没有显着的相关性，在公里尺度之间的声阻抗和检索的基础滑动或基础阻力。然而，当比较沿着各个曲线的平均值时，存在更强的相关性。我们假设，相关性出现在长度尺度上，基底变化对大规模冰盖流动很重要。虽然地震技术对河床的材料特性很敏感，但目前还没有明确的方法将冰流河床特性的高分辨率地震测量纳入冰流模型。我们的结论是，更多的理论工作需要做之前，在冰床界面的机械条件的约束声阻抗测量可以直接用于冰盖模型。
We investigate correlations between seismically derived estimates of basal acoustic impedance and basal slipperiness values obtained from a surface‐to‐bed inversion using a Stokes ice flow model. Using high‐resolution measurements along several seismic profiles on Pine Island Glacier (PIG), we find no significant correlation at kilometer scale between acoustic impedance and either retrieved basal slipperiness or basal drag. However, there is a stronger correlation when comparing average values along the individual profiles. We hypothesize that the correlation appears at the length scales over which basal variations are important to large‐scale ice sheet flow. Although the seismic technique is sensitive to the material properties of the bed, at present there is no clear way of incorporating high‐resolution seismic measurements of bed properties on ice streams into ice flow models. We conclude that more theoretical work needs to be done before constraints on mechanical conditions at the ice‐bed interface from acoustic impedance measurements can be of direct use to ice sheet models.
探索贝叶斯冰川反演中变换群先验的使用和最大相对熵方法
影响因子：
3.4
作者：
Arthern R
通讯作者：
Arthern R