论文标题
一种新型的方法来开发弹性变形以限制南极的区域冰量变化
A novel approach to exploit elastic deformation to constrain regional ice mass change in Antarctica
论文作者
论文摘要
在整个ANET GNSS网络中，南极冰盖的十年质量损失可使弹性上升速率高达20毫米/年。我们首次探讨了在Anet GNSS网络中观察到的弹性变形的生存力来限制南极洲的冰质量变化。我们首先估计哪些冰块损失区域有助于在每个Anet GNSS位点观察到的弹性变形。这是使用以观察者为中心的弹性变形模型来完成的，我们称之为负载灵敏度内核（LSK）。使用这种方法，我们发现大多数ANET位点处的弹性变形主要由远场质量变化主导。超过70％的ANET站点需要在200公里或更高的半径内进行冰量变化，以便在恢复该站点弹性变形的90％之前。我们表明，一对相邻GNSS接收器的LSK之间的差异可用于定位负责差分位移的近场质量变化。最后，我们以一种使用任意数量的GNSS网站的新方法来概括这一点。在这种方法中，每个站点的LSK都加权并以线性系列添加。优化了这些权重，使得在关注区域之外的质量变化弹性变形被最小化。我们证明，在阿蒙森海区域中的7个Anet GNSS位点可以隔离垂直和水平成分中的弹性变形，这仅来自猪的质量损失和/或PSK冰川的损失。使用当前的GNSS接收器分布，可以表达由于THWAITES质量变化引起的弹性变形的东部成分，可以相对于PSK的质量变化表达。我们的结果表明，当前的ANET构型可以使用弹性变形来限制南极的冰质量变化，尤其是在具有GNSS的相对密度簇的区域。
Across the ANET GNSS network, decadal mass loss of the Antarctic ice sheet drives elastic uplift rates of up to 20 mm/yr. We explore, for the first time, the viability of using elastic deformation observed in the ANET GNSS network to constrain ice mass changes in Antarctica. We begin by estimating which regions of ice mass loss contribute to the elastic deformation observed at each ANET GNSS site. This is done using an observer-centric model of elastic deformation, which we call a Load Sensitivity Kernel (LSK). Using this approach, we find that the elastic deformation at the majority of ANET sites is dominated by far-field mass change. Over 70% of ANET sites require ice mass change within a radius of 200km or greater to be included before 90% of the site's elastic deformation is recovered. We show that the difference between LSKs of a pair of neighboring GNSS receivers can be used to localize the near-field mass change responsible for the differential displacement. Finally, we generalize this in a novel approach that uses an arbitrary number of GNSS sites. In this approach, LSKs of each site are weighted and added in a linear series. These weights are optimized such that the elastic deformation from mass change outside a Region of Interest is minimized. We demonstrate that 7 ANET GNSS sites in the Amundsen Sea region can isolate the elastic deformation, in both the vertical and horizontal components, that results exclusively from PIG's mass loss and/or the losses of the PSK glaciers. With the current GNSS receiver distribution, the east component of elastic deformation due to mass change at Thwaites can be expressed relative to mass changes at PSK. Our results demonstrate that the current ANET configuration can use elastic deformation to constrain ice mass changes in Antarctica, especially in regions with relatively dense clusters of GNSS.
