Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)
Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)
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DOI：
10.5194/essd-10-493-2018
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发表时间：
2017-06
影响因子：
11.4
通讯作者：
I. Sasgen;A. Martín‐Español;A. Horvath;V. Klemann;E. Petrie;B. Wouters;M. Horwath;R. Pail;J. Bamber;P. Clarke;H. Konrad;T. Wilson;M. Drinkwater
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作者：
I. Sasgen;A. Martín‐Español;A. Horvath;V. Klemann;E. Petrie;B. Wouters;M. Horwath;R. Pail;J. Bamber;P. Clarke;H. Konrad;T. Wilson;M. Drinkwater
抽象的。对冰川均衡调整（GIA）引起的固体地球持续变形的校正知之甚少，这是根据卫星重力测量和在较小程度上卫星测高测量确定南极冰盖质量平衡的一个主要不确定性。在过去的十年中，已经取得了很大的进展，在一致的模拟冰盖和固体地球的相互作用，然而，在南极洲的GIA的正演模拟解决方案仍然不确定，由于稀疏的冰盖演变的约束，以及地球的流变特性。估计全球影响评估的另一种方法是联合反演多个卫星数据，即卫星重力测量、卫星测高和全球定位系统，这些数据以不同的敏感度反映了最近冰川变化和全球影响评估的趋势。这一方法成功的关键是空间大地测量数据集的准确性。在这里，我们提出了表面冰高程变化（Envisat/冰，云和陆地高程卫星，ICESat; 2003-2009），重力场变化（重力恢复和气候实验，GRACE; 2003-2009）和基岩隆起（GPS; 1995-2013）的再处理率。数据分析的补充，由粘弹性响应函数的圆盘载荷迫使的正演模拟，使我们能够与GIA引起的表面位移与重力变化的固体地球的不同流变参数。这里提供的数据和建模结果可在PANGAEA数据库（https://doi.org/10.1594/PANGAEA.875745）中找到。这些数据集是对目前冰量变化和全球影响评估进行联合反演估计的输入流，重点是南极洲。然而，本文提供的方法，程序和数据可以用来解决其他问题，如南极冰盖的体积平衡，或可以应用到其他地理区域的粘弹性响应函数的情况下。本文介绍了两个贡献的第一个，总结了在欧洲航天局资助的研究：区域冰川均衡调整和CryoSat海拔率校正在南极洲（REGINA）内进行的工作。
Abstract. The poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA) is a major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry and to a lesser extent satellite altimetry. In the past decade, much progress has been made in consistently modeling ice sheet and solid Earth interactions; however, forward-modeling solutions of GIA in Antarctica remain uncertain due to the sparsity of constraints on the ice sheet evolution, as well as the Earth's rheological properties. An alternative approach towards estimating GIA is the joint inversion of multiple satellite data – namely, satellite gravimetry, satellite altimetry and GPS, which reflect, with different sensitivities, trends in recent glacial changes and GIA. Crucial to the success of this approach is the accuracy of the space-geodetic data sets. Here, we present reprocessed rates of surface-ice elevation change (Envisat/Ice, Cloud,and land Elevation Satellite, ICESat; 2003–2009), gravity field change (Gravity Recovery and Climate Experiment, GRACE; 2003–2009) and bedrock uplift (GPS; 1995–2013). The data analysis is complemented by the forward modeling of viscoelastic response functions to disc load forcing, allowing us to relate GIA-induced surface displacements with gravity changes for different rheological parameters of the solid Earth. The data and modeling results presented here are available in the PANGAEA database ( https://doi.org/10.1594/PANGAEA.875745 ). The data sets are the input streams for the joint inversion estimate of present-day ice-mass change and GIA, focusing on Antarctica. However, the methods, code and data provided in this paper can be used to solve other problems, such as volume balances of the Antarctic ice sheet, or can be applied to other geographical regions in the case of the viscoelastic response functions. This paper presents the first of two contributions summarizing the work carried out within a European Space Agency funded study: Regional glacial isostatic adjustment and CryoSat elevation rate corrections in Antarctica (REGINA).