1-km resolution rebound surfaces and paleotopography of glaciated North America since the Last Glacial Maximum.

We present a series of 1-km spatial resolution rebound (isobase) surfaces based on publicly distributed predictions obtained from the glacio-isostatic adjustment models known as ICE-5G (VM2 L90), ICE-6G_C (VM5a) and ICE-7G_NA (VM7). Our objective is to provide readily accessible tools for a broad range of geological and paleoenvironmental studies, and to facilitate direct comparison between models’ predictions and field-based observations. Rebound surfaces were interpolated at the scale of North American ice sheets (35.5°-89.5°N; 45°-165°W) and for each time increment of the models (1,000-500 yrs, between 26,000-21,000 yrs BP and present-day). The assessment of the interpolations indicates that the rebound surfaces have an overall vertical accuracy of ∼0.4 m compared to original ICE-xG outputs. These rebound surfaces were combined with the GEBCO 2021 present-day elevation grid to reconstruct the paleotopography for each time increment of the models and are all presented as raster files that can be easily integrated into geographical information systems. The resulting datasets therefore provide a unique support for geological, paleoenvironmental and archeological studies.

我们基于从冰川均衡调整模型（即ICE - 5G（VM2 L90）、ICE - 6G_C（VM5a）和ICE - 7G_NA（VM7））获得的公开发布的预测，展示了一系列1千米空间分辨率的回弹（等基线）面。我们的目标是为广泛的地质和古环境研究提供易于获取的工具，并促进模型预测与实地观测之间的直接比较。回弹面是在北美冰盖范围（北纬35.5° - 89.5°；西经45° - 165°）以及模型的每个时间增量（公元前26000 - 21000年到现今之间的1000 - 500年）进行插值的。对插值的评估表明，与原始的ICE - xG输出相比，回弹面总体垂直精度约为0.4米。这些回弹面与GEBCO 2021现今高程网格相结合，以重建模型每个时间增量的古地形，并且都以栅格文件形式呈现，可轻松集成到地理信息系统中。因此，所得数据集为地质、古环境和考古研究提供了独特的支持。