Reconstruction of the palaeo-sea level of Britain and Ireland arising from empirical constraints of ice extent: implications for regional sea level forecasts and North American ice sheet volume
Reconstruction of the palaeo-sea level of Britain and Ireland arising from empirical constraints of ice extent: implications for regional sea level forecasts and North American ice sheet volume
复制标题
根据冰范围的经验约束重建英国和爱尔兰的古海平面：对区域海平面预测和北美冰盖体积的影响
DOI：
10.1002/jqs.3523
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发表时间：
2023
影响因子：
2.3
通讯作者：
Bradley S
中科院分区：
文献类型：
--
作者：
Bradley S
古海平面重建对于预测未来海平面变化和限制古冰盖重建至关重要，同时对第四纪科学的广泛应用也很有用。以前对英国和爱尔兰古海平面的重建依赖于冰川均衡模型的循环调整：输入的冰盖厚度和范围被反复改变，以适应相对海平面数据。在这里，我们利用来自BRITICE - CHRONO项目的新数据打破了这种循环，该项目限制了英国-爱尔兰冰盖边缘随时间的位置，我们将推导出的冰川-均衡模型与丰富的相对海平面记录进行了比较。我们测试了一组合理的冰厚情景，这些情景解释了北海冰缘位置的不确定性，展示了区域海平面数据可以区分不同冰川情景的区域。然后将我们的最优重建与几个全局尺度的重建相结合。由于英国-爱尔兰冰盖的信号是受限的，我们展示了如何使用英国和爱尔兰的相对海平面记录来测试远场冰盖的重建（例如南极洲、欧亚大陆和劳伦泰德）。得到的古地形数据可能对多个学科有用。最后，我们改进的海平面重建方法对当代垂直陆地运动预测的影响。
Reconstructions of palaeo‐sea level are vital for predicting future sea level change and constraining palaeo‐ice sheet reconstructions, as well as being useful for a wide array of applications across Quaternary Science. Previous reconstructions of the palaeo‐sea level of Britain and Ireland relied on a circular tuning of glacio‐isostatic models: input ice sheet thicknesses and extents were iteratively altered to fit relative sea level data. Here we break that circularity by utilizing new data from the BRITICE‐CHRONO project, which constrains the position of the British–Irish ice sheet margin through time, and we compare derived glacio‐isostatic modelling to the rich relative sea level record. We test a combination of plausible ice thickness scenarios which account for the uncertainty of ice margin position over the North Sea, demonstrating the region where regional sea level data could distinguish between different glaciation scenarios. Our optimal reconstruction is then combined with several global‐scale reconstructions. As the signal of the British–Irish Ice Sheet is constrained, we demonstrate how the relative sea level record of Britain and Ireland can be used to test reconstructions of far‐field ice sheets (e.g. Antarctica, Eurasia and the Laurentide). The derived palaeo‐topography data are likely to be useful for multiple disciplines. Finally, our improved method of sea level reconstruction impacts predictions of contemporary vertical land motion.