Yedoma

Yedoma refers to a specific type of permafrost found in Siberia and Alaska. It is characterized by its ice-rich nature, often containing high concentrations of ground ice, and its fine-grained sediment composition, typically silt and clay. This permafrost is ancient, with radiocarbon dating suggesting that many yedoma deposits formed during the Pleistocene epoch, some dating back over 50,000 years.

The organic content within yedoma is often significant, with preserved plant and animal remains contributing to its unique composition. This organic matter can be highly reactive when thawed. Yedoma is particularly important because it is highly susceptible to thermokarst development, a process where thawing permafrost causes the ground surface to subside and form depressions or lakes. As global temperatures rise, yedoma is thawing at an accelerated rate, releasing greenhouse gases such as carbon dioxide and methane, which can further contribute to climate change.

Scientific research into yedoma is crucial for understanding past climate conditions and predicting future environmental changes. Its study helps scientists estimate the potential carbon feedback loops associated with permafrost thaw and the impact on Arctic ecosystems. The thawing of yedoma also poses challenges for infrastructure development in the Arctic regions where it is prevalent.