Northern Greenland's Ice Dome Already Melted in a Past Warm Period
A recent study alters what we knew about ice stability in Greenland. Geological evidence shows that its northern ice dome, an area presumed to be resistant, disappeared during a warm climatic phase in the past. Scientists are investigating this precedent to anticipate how the ice might respond to current temperatures 🌍.
A Historical Archive Beneath the Seafloor
The team analyzed sediment cores extracted near the Petermann Glacier. They found plant remains, such as mosses and lichens, in a remarkable state of preservation. This organic material dates back approximately 416,000 years, an interglacial period when global temperatures exceeded pre-industrial levels by only 1.5 to 2.5 °C. The presence of these plants proves that the terrain was ice-free and capable of supporting life.
Key Findings from the Study:- The plant material indicates an exposed and habitable landscape where there is now a massive ice layer.
- The warming that caused the melting was moderate, similar to what the planet could soon reach.
- This event occurred in northern Greenland, an area that models considered a stable stronghold.
Ice holds the memory of past climates, and its history warns us about Greenland's sensitivity.
Direct Consequences for Sea Level Rise
This discovery has profound implications. If the northern Greenland ice dome were to melt completely, it would contribute to raising the global sea level by more than two meters. The study debunks the idea that this region is a permanent ice block and shows that it can lose mass significantly during episodes of prolonged warming.
Main Implications:- Reevaluate the real vulnerability of ice sheets thought to be the most stable.
- Understand that relatively low temperature peaks can trigger massive ice loss.
- Reinforce the urgent need to reduce emissions to limit future warming.
A Lesson from the Past for the Climate Future
The research underscores that Greenland's ice is more sensitive than expected. Its geological record acts as a clear warning: warm periods similar to those we are approaching have already caused extensive melting. These data reinforce the urgency to act against climate change, as the fate of this ice sheet will directly affect coastlines worldwide 📈.