Relic of long-vanished ice sheet holds clues to ancient climate.

The article focuses on the discovery and study of ancient glacial ice at Cape Blossom, Alaska, which researchers believe may be at least 350,000 years old, potentially making it the oldest known ice in the Northern Hemisphere. This ice, preserved within permafrost and associated with glacial advances following the Marine Isotope Stage 11 (MIS-11) interglacial period, offers a rare opportunity to understand Arctic climate history and ice dynamics during the Pleistocene epoch. Scientists face challenges in dating and analyzing the ice due to contamination and melting, but its presence provides valuable constraints on past temperatures and ice extent in northern Alaska. The rapidly eroding coastline threatens the ice’s preservation, underscoring the urgency for research to better comprehend past climate changes relevant to future warming scenarios. [Extracted from the article]