南方科技大学冉将军和荷兰代尔夫特理工大学Ditmar Pavel合作，报道了垂直基岩的移动揭示格陵兰冰盖的夏季储水量变化。该研究成果于2024年10月30日发表在国际顶尖学术期刊《自然》上。

据了解，格陵兰冰盖（GrIS）目前是全球质量诱导海平面上升的最大单一贡献者，其主要原因是北极对日益变暖的地球响应的扩大。然而，冰川水的积累、储存和最终释放的过程仍然没有得到很好地控制。

研究发现，大量的夏季融水沿着整个GrIS外围被暂时缓冲，在7月达到峰值，之后逐渐减少。研究结果是通过分析全球导航卫星系统（GNSS）站点测量的基岩弹性变形，来量化GrIS水的总质量的时空行为。在融化季节，缓冲的融水使靠近GNSS站点的基岩最多沉降约5mm。

从区域来看，融水储存的持续时间从东南部的4.5周到其他地方的9周不等。研究人员还表明，从区域气候模型模拟的融水径流可能包含系统误差，需要进一步调整达到最温暖的年份的约20%。研究结果强调，GNSS数据在限制格陵兰岛鲜为人知的水文过程方面具有很大潜力，为改进对未来GrIS融化行为和相关海平面上升的预测奠定了基础。

附：英文原文

Title: Vertical bedrock shifts reveal summer water storage in Greenland ice sheet

Author: Ran, Jiangjun, Ditmar, Pavel, van den Broeke, Michiel R., Liu, Lin, Klees, Roland, Khan, Shfaqat Abbas, Moon, Twila, Li, Jiancheng, Bevis, Michael, Zhong, Min, Fettweis, Xavier, Liu, Junguo, Nol, Brice, Shum, C. K., Chen, Jianli, Jiang, Liming, van Dam, Tonie

Issue&Volume: 2024-10-30

Abstract: The Greenland ice sheet (GrIS) is at present the largest single contributor to global-mass-induced sea-level rise, primarily because of Arctic amplification on an increasingly warmer Earth. However, the processes of englacial water accumulation, storage and ultimate release remain poorly constrained. Here we show that a noticeable amount of the summertime meltwater mass is temporally buffered along the entire GrIS periphery, peaking in July and gradually reducing thereafter. Our results arise from quantifying the spatiotemporal behaviour of the total mass of water leaving the GrIS by analysing bedrock elastic deformation measured by Global Navigation Satellite System (GNSS) stations. The buffered meltwater causes a subsidence of the bedrock close to GNSS stations of at most approximately 5mm during the melt season. Regionally, the duration of meltwater storage ranges from 4.5weeks in the southeast to 9weeks elsewhere. We also show that the meltwater runoff modelled from regional climate models may contain systematic errors, requiring further scaling of up to about 20% for the warmest years. These results reveal a high potential for GNSS data to constrain poorly known hydrological processes in Greenland, forming the basis for improved projections of future GrIS melt behaviour and the associated sea-level rise.

DOI: 10.1038/s41586-024-08096-3

Source: https://www.nature.com/articles/s41586-024-08096-3