Department of Geography, Durham University, Durham, UK.
Research School of Earth Sciences, Australian National University, ACT, Canberra, Australia.
Nat Commun. 2021 Apr 1;12(1):2015. doi: 10.1038/s41467-021-21990-y.
The most rapid global sea-level rise event of the last deglaciation, Meltwater Pulse 1A (MWP-1A), occurred ∼14,650 years ago. Considerable uncertainty regarding the sources of meltwater limits understanding of the relationship between MWP-1A and the concurrent fast-changing climate. Here we present a data-driven inversion approach, using a glacio-isostatic adjustment model to invert for the sources of MWP-1A via sea-level constraints from six geographically distributed sites. The results suggest contributions from Antarctica, 1.3 m (0-5.9 m; 95% probability), Scandinavia, 4.6 m (3.2-6.4 m) and North America, 12.0 m (5.6-15.4 m), giving a global mean sea-level rise of 17.9 m (15.7-20.2 m) in 500 years. Only a North American dominant scenario successfully predicts the observed sea-level change across our six sites and an Antarctic dominant scenario is firmly refuted by Scottish isolation basin records. Our sea-level based results therefore reconcile with field-based ice-sheet reconstructions.
末次冰消期海平面上升最快的事件，融水脉冲 1A（MWP-1A），发生在约 14650 年前。对融水来源的不确定性限制了对 MWP-1A 与同期快速气候变化之间关系的理解。在这里，我们提出了一种数据驱动的反演方法，使用冰川均衡调整模型，通过来自六个地理分布地点的海平面约束来反演 MWP-1A 的来源。结果表明，南极洲的贡献为 1.3 米（0-5.9 米；95%概率），斯堪的纳维亚半岛为 4.6 米（3.2-6.4 米），北美洲为 12.0 米（5.6-15.4 米），导致全球海平面在 500 年内上升 17.9 米（15.7-20.2 米）。只有北美主导的情景成功地预测了我们六个地点的观测到的海平面变化，而南极主导的情景则被苏格兰隔离盆地的记录断然否定。因此，我们基于海平面的结果与基于实地的冰盖重建结果相一致。
