2026-01-05 バッファロー大学（UB）
A core of bedrock and sediment pulled up from 300 feet below the Greenland Ice Sheet near the edge of Prudhoe Dome. This study analyzed another core pulled from 1,600 feet before the ice sheet. Photo: Jason Briner/University at Buffalo
＜関連情報＞
- https://www.buffalo.edu/news/releases/2026/01/first-greendrill-study.html
- https://www.nature.com/articles/s41561-025-01889-9
完新世の温暖化によるグリーンランド北西部のプルドードームの氷河融解 Deglaciation of the Prudhoe Dome in northwestern Greenland in response to Holocene warming
Caleb K. Walcott-George,Nathan D. Brown,Jason P. Briner,Allie Balter-Kennedy,Nicolás E. Young,Tanner Kuhl,Elliot Moravec,Sridhar Anandakrishnan,Nathan T. Stevens,Benjamin Keisling,Robert M. DeConto,Vasileios Gkinis,Joseph A. MacGregor & Joerg M. Schaefer
Nature Geoscience Published:05 January 2026
DOI:https://doi.org/10.1038/s41561-025-01889-9
Abstract
Projections of future sea-level rise benefit from understanding the response of past ice sheets to warming during past Quaternary interglacials. Constraints on the extent of inland Greenland Ice Sheet retreat during the Middle Holocene (~8–4 thousand years before present) are limited because geological records of a smaller-than-modern phase largely remain beneath the modern ice sheet. We drilled through 509 metres of firn and ice at Prudhoe Dome, northwestern Greenland, to obtain sub-ice material yielding direct evidence for the response of the northwest Greenland ice sheet to Holocene warmth. Here we present infrared stimulated luminescence measurements from sub-ice sediments that indicate that the ground below the summit was exposed to sunlight 7.1 ± 1.1 thousand years ago. This proposed complete deglaciation of Prudhoe Dome, coeval to reduced extent at other ice caps across northern Greenland, is consistent with interglacial-only δ18O values from the Prudhoe Dome ice column and ice depth–age modelling. Our results point to a substantial response of the northwest Greenland ice sheet to early Holocene warming, estimated to be +3–5 °C from palaeoclimate data. This range of summer temperatures is similar to projections of warming by 2100 CE.
