美国布朗大学Coulson Sophie团队报道，全球冰损失级联解释了融水脉冲1A海平面上升模式。这一研究成果发表在2025年2月18日出版的国际学术期刊《自然—地球科学》上。
据介绍，在上一次冰川消退期间，全球海平面上升了120-130m, 其中的10-20m是由单一的灾难性事件造成的，称为融水脉冲1A（MWP-1A），在大约14.6kyr之前，持续时间最长不超过500年。由于数据的限制和地球变形的简化模型，以前的研究一直在努力确定造成MWP-1A的冰强度，它的时间，以及对全球气候的影响。随着古海平面记录的扩展，和越来越多的人认为在MWP-1A时间尺度上发生更复杂的地球变形，重新研究MWP-1A是适时的。
该团队解决了MWP-1A上的冰损失序列，主题是一个时空海平面指纹方法，该方法受海平面数据时间变化的限制，完全模拟了瞬态粘弹性变形，从而导致时空融化演变。他们最喜欢的冰盖融化顺序开始于劳伦潮贡献了~3米(~14.6–14.2kyr之前），其次是欧亚大陆和西南极洲贡献了7个M和~5M，分别为(~14.35 ~ 14.2kyr之前)。
这一情景与代理数据一致，这些数据表明劳伦潮的贡献最小，欧亚冰原复合体的退缩很大。他们的MWP-1A冰演化要求对全球冰史进行修正，并阐明了与现代冰崩塌和海平面上升相关的变形反馈。
附：英文原文
Title: Meltwater Pulse 1A sea-level-rise patterns explained by global cascade of ice loss
Author: Coonin, Allie N., Lau, Harriet C. P., Coulson, Sophie
Issue&Volume: 2025-02-18
Abstract: Over the last deglaciation, global sea level rose by ~120–130m, 10–20m of which was attributed to a singular, catastrophic event known as Meltwater Pulse 1A (MWP-1A) that spanned at most 500years approximately 14.6kyr ago. Given data limitations and simplified models of Earth deformation, previous studies have struggled to determine the ice sources responsible for MWP-1A, its timing and, consequently, the impacts on global climate. With the expansion of palaeo sea-level records and growing consensus that more complex Earth deformation occurs over MWP-1A timescales, revisiting MWP-1A is timely. Here we resolve a sequence of ice loss over MWP-1A using a spatiotemporal sea-level fingerprinting approach constrained by temporal variations across sea-level data that fully models transient viscoelastic deformation, resulting in a space–time melt evolution. Our favoured sequence of ice sheet melting begins with the Laurentide contributing ~3m (~14.6–14.2kyr ago), followed by Eurasia and West Antarctica contributing ~7m and ~5m, respectively (~14.35–14.2kyr ago). This scenario is consistent with proxy data that suggest a minimal Laurentide contribution and large retreat of the Eurasian Ice Sheet Complex. Our MWP-1A ice evolution demands the revision of global ice histories and illustrates deformation feedbacks that are relevant for modern ice collapse and sea-level rise.
DOI: 10.1038/s41561-025-01648-w
Source: https://www.nature.com/articles/s41561-025-01648-w