Ancient Melt Shows Greenland’s Prudhoe Dome Disappeared 7,000 Years Ago

Scientists drilling beneath Greenland’s ice sheet have found that the Prudhoe Dome high point disappeared completely about 7,000 years ago. The discovery, published on April 17, 2026, challenges assumptions that the interior of the ice cap is largely immune to rapid loss^[1].

The finding matters because it shows the ice sheet can undergo dramatic change during relatively mild warming periods, a scenario that mirrors today’s human‑driven climate trajectory. If the interior can melt quickly once, it could do so again under current warming, accelerating sea‑level rise.

Researchers extracted sediment cores and ice samples from a borehole drilled to the base of the dome. Analysis of trapped air bubbles, isotopic ratios, and volcanic ash layers indicated a sudden transition from thick ice to bare ground around 7,000 years ago^[1]. The team cross‑checked the timeline with radiocarbon dates from nearby marine deposits, confirming the melt event’s timing.

The melt occurred during a naturally warm interval known as the Holocene Thermal Maximum. Scientists said the melt happened despite only modest temperature increases, suggesting that Greenland’s interior ice may be more sensitive to warming than models have assumed^[1]. This challenges the view that only the ice sheet’s margins are vulnerable.

“Even a modest rise in temperature can destabilize key ice‑sheet features,” a lead researcher said. “Our data show that Prudhoe Dome vanished completely during a period that was only slightly warmer than today.” The statement underscores the potential for rapid interior loss under present‑day warming trends.

The study adds to a growing body of evidence that Greenland’s ice dynamics are complex and can shift quickly. Earlier work has documented accelerated melt at the sheet’s edges; this new interior example broadens the risk landscape. Policymakers and climate modelers will need to incorporate the possibility of sudden, large‑scale interior melt when projecting future sea‑level scenarios.

**What this means:** The ancient disappearance of Prudhoe Dome demonstrates that Greenland’s ice sheet is not uniformly stable. A relatively mild natural warming episode was enough to melt a major high point completely, implying that today’s anthropogenic warming could trigger similar or faster interior losses. Incorporating such rapid‑change potential into climate forecasts is essential for accurate sea‑level rise predictions and for informing mitigation strategies.