Researchers in the Ötztal Alps are urgently drilling into the Weißseespitze glacier to extract climate data before it melts away. The glacier preserves layers of pollutants and natural markers from centuries past, offering insights into historical human activity and environmental changes. Warmer temperatures have already erased records from the 1600s onward.
High in the Ötztal Alps near the Austria-Italy border, the Weißseespitze glacier acts as a natural archive, with layers of ice capturing atmospheric compounds over thousands of years. Snowfall has preserved pollutants like arsenic from medieval mining and smelting, as well as natural signals such as wildfire chemicals and volcanic metals from the 13th and 16th centuries CE. Around 1000 CE, spikes in levoglucosan—a marker of burning vegetation—aligned with charcoal in nearby peatlands, pointing to wildfires during a century-long drought fueled by erratic rainfall patterns similar to today's weather whiplash in regions like the American West. Lead from human activities was detectable even a millennium ago, showing early atmospheric impacts. Spagnesi's team drilled over 30 feet to bedrock in 2019, but by 2025, the glacier's depth had shrunk to 18 feet, with some 30 percent of Ötztal glaciers at risk of vanishing in the next five years. The upper layers since the 1600s have already melted, leaving records from the second to 17th centuries CE. “It’s really a race against time, because we have this unique opportunity to inspect the memory of this glacier,” said Azzurra Spagnesi, paleoclimatologist at University Ca’ Foscari of Venice and lead author of a recent paper on the glacier's pollutants. Unlike remote Greenland or Antarctic cores, these European glaciers provide higher-resolution local data due to proximity to historical human activity, including the Industrial Revolution's birthplace. “These local glaciers are going to tell you more of what’s going on nearby,” noted Paul Bierman, a geoscientist at the University of Vermont. Scientists aim to feed this data into climate models for better predictions. “Glaciers are not just ice,” Spagnesi emphasized. “They are the archives of the Earth’s memory.”
