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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations
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Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

机译：冰川等静调整模型的改进约束：地面大地观测的贡献回顾

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The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is uncertain due to insufficient constraints on our knowledge of past glacial changes and to large simplifications in the underlying Earth models. Consequently, we show differences between models that exceed several mm/year in terms of surface displacement for the two major ice sheets: Greenland and Antarctica. Geodetic measurements of surface displacement offer the potential for new constraints to be made on GIA models, especially when they are used to improve structural features of the Earth's interior as to allow for a more realistic reconstruction of the glaciation history. We present the distribution of presently available campaign and continuous geodetic measurements in Greenland and Antarctica and summarise surface velocities published to date, showing substantial disagreement between techniques and GIA models alike. We review the current state-of-the-art in ground-based geodesy (GPS, VLBI, DORIS, SLR) in determining accurate and precise surface velocities. In particular, we focus on known areas of need in GPS observation level models and the terrestrial reference frame in order to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates.
机译：目前，在气候研究中，迫切需要提供精确的冰川等静压调整模型（GIA），这主要是因为重力恢复和气候实验（GRACE）数据有可能用于确定准确的全欧洲范围的冰雪评估。质量变化和水文学。但是，由于对过去冰川变化的了解缺乏足够的限制，并且基本地球模型的简化程度很高，因此无法对GIA进行建模。因此，我们在两个主要冰原（格陵兰和南极洲）的表面位移方面显示了超过几毫米/年的模型之间的差异。大地测量的表面位移为在GIA模型上施加新的约束提供了可能，尤其是当它们用于改善地球内部的结构特征以便更真实地重建冰川历史时。我们介绍了格陵兰和南极洲目前可用的战役和连续大地测量数据的分布，并总结了迄今为止发布的地表速度，显示出技术与GIA模型之间的实质性分歧。在确定准确和精确的表面速度时，我们回顾了地面大地测量学（GPS，VLBI，DORIS，SLR）的最新技术。特别是，我们专注于GPS观测水平模型和地面参考框架中的已知需求领域，以便将大地观测的精确度/精度提高到0.1 mm /年，因此进一步限制了GIA模型和随后的当前冰量变化估计。

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