Glacial isostatic adjustment associated with the Barents Sea ice sheet: A modelling inter-comparison
Glacial isostatic adjustment associated with the Barents Sea ice sheet: A modelling inter-comparison
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DOI：
10.1016/j.quascirev.2016.02.011
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发表时间：
2016-09-01
影响因子：
4
通讯作者：
Hubbard, A.
中科院分区：
文献类型：
--
作者：
Auriac, A.;Whitehouse, P. L.;Hubbard, A.
巴伦支海冰盖 (BSIS) 的 3D 几何演化，特别是在其晚冰期退缩阶段，在很大程度上仍然不明确，因为缺乏直接的海洋和陆地证据限制了其水平和垂直范围和年代。验证先前提出的大量 BSIS 重建的一种方法是在各种地球模型下整理和应用它们，并将随时间变化的预测（均衡）输出与已知的相对海平面 (RSL) 数据进行比较。在这里，我们通过球形地球系统模型比较了六个对比的 BSIS 负载场景，并使用来自该域内四个主要陆地区域（斯瓦尔巴群岛、法兰士约瑟夫地群岛、新地岛和挪威北部）的 RSL 数据得出最佳拟合 chi(2) 参数。较差的 chi(2) 值允许忽略两种负载场景，留下四种与 RSL 观察结果非常吻合的负载场景。其余四种情景与上地幔粘度为 0.2-2 x 10(21) Pa s 的地球模型最适合 RSL 数据，而对岩石圈厚度（范围为 71 至 120 km）和下地幔粘度（跨度为 1-50 x 10(21) Pa s）的敏感性较低。 GPS 观测结果还与当前巴伦支海隆起的预测进行了比较。还确定了相对海平面和 GPS 数据对限制未来冰盖建模工作至关重要的关键位置。 (C) 2016 Elsevier Ltd. 保留所有权利。
The 3D geometrical evolution of the Barents Sea Ice Sheet (BSIS), particularly during its late-glacial retreat phase, remains largely ambiguous due to the paucity of direct marine- and terrestrial-based evidence constraining its horizontal and vertical extent and chronology. One way of validating the numerous BSIS reconstructions previously proposed is to collate and apply them under a wide range of Earth models and to compare prognostic (isostatic) output through time with known relative sea-level (RSL) data. Here we compare six contrasting BSIS load scenarios via a spherical Earth system model and derive a best-fit, chi(2) parameter using RSL data from the four main terrestrial regions within the domain: Svalbard, Franz Josef Land, Novaya Zemlya and northern Norway. Poor chi(2) values allow two load scenarios to be dismissed, leaving four that agree well with RSL observations. The remaining four scenarios optimally fit the RSL data when combined with Earth models that have an upper mantle viscosity of 0.2-2 x 10(21) Pa s, while there is less sensitivity to the lithosphere thickness (ranging from 71 to 120 km) and lower mantle viscosity (spanning 1-50 x 10(21) Pa s). GPS observations are also compared with predictions of present-day uplift across the Barents Sea. Key locations where relative sea-level and GPS data would prove critical in constraining future ice-sheet modelling efforts are also identified. (C) 2016 Elsevier Ltd. All rights reserved.