Antarctic Permafrost Emitting Significant Carbon Dioxide Levels
New research reveals unexpected CO2 seepage from Antarctic soils matching Arctic emission rates.
1Unexpected Carbon Seepage Detected
Research conducted in Antarctica’s Taylor Valley reveals a concerning rise in CO2 emissions from frozen soils. Between 2020 and 2025, measurements showed a five-and-a-half-fold increase in gas seepage. Scientists observed rates climbing from 1.7 grams per square meter daily to 9.5 grams, a trend that was entirely unexpected by the research team.
2Field Methodology and Validation
Livio Ruggiero and his team from Italy’s National Research Council utilized canisters driven into the ground to monitor gas percolation. To ensure accuracy, they extracted samples for sophisticated laboratory testing at their research station. These secondary tests confirmed that the high concentrations of carbon dioxide detected in the field were indeed real.
3Comparison With Arctic Emissions
The observed emission rate of 9.5 grams per day is comparable to Arctic soil emissions during summer months. However, the underlying mechanisms differ significantly. While Arctic emissions typically stem from decomposing flora, Antarctic gases appear to originate from ancient subterranean stores mobilized by shifting hydrology, rather than simple surface permafrost thawing processes.
4Unclear Drivers of Seepage
Peter Morse of the Geological Survey of Canada notes that the rise is not clearly driven by standard permafrost thaw. While permafrost often acts as a lid on oil and gas reservoirs, the specific cause of this increased leakage remains unidentified, necessitating further investigation into the continent's complex and changing geological structures.
5Subglacial Lake Hypothesis
Researchers speculate that melting glaciers may be accelerating the discharge of brines from interior subglacial lakes. These lakes have accumulated salt and carbon dioxide over aeons. This salt water could potentially be thawing permafrost from the bottom up, creating pathways for subterranean carbon dioxide to escape into the atmosphere at increasing rates.
6Global Tipping Point Risks
Ida Kubiszewski, who led a 2024 study on Antarctic tipping points, identifies permafrost as a critical area of concern. She emphasizes that current scientific understanding of these processes is limited. This new data serves as a vital piece of the puzzle in assessing the global threats posed by the continent's changing environmental state.
7Scaling Total Annual Emissions
When scaled to the total ice-free terrain in Antarctica, the team estimates annual emissions could reach 76.8 million tonnes of CO2. This figure is strikingly comparable to Chile’s total annual greenhouse gas emissions of 78.7 million tonnes in 2024, highlighting the potential scale of this previously unaccounted source of atmospheric carbon.
8Implications for Carbon Budgets
Ruggiero’s team argues that climate scientists must integrate these findings into southern hemisphere carbon budgets. While the current estimate is not a rigorous inventory, it reveals a significant, overlooked carbon source. Future expeditions are planned to further investigate these subterranean processes and their long-term impact on the global climate system.
Original article: New Scientist — Antarctic Permafrost Emitting Significant Carbon Dioxide Levels