WASHINGTON, October 2 — The thawing of Arctic permafrost is accelerating the release of carbon dioxide and methane into the atmosphere, according to the National Oceanic and Atmospheric Administration (NOAA). Permafrost contains twice as much carbon as the Earth’s atmosphere, NOAA data shows. This vast frozen soil layer, when thawed due to global warming, releases greenhouse gases that could significantly impact climate change models.
A 2016 study published in the journal Nature estimated that by 2100, thawing permafrost could release 140 billion metric tons of carbon dioxide equivalent. This amount is equivalent to approximately 32 years of global fossil fuel emissions at 2010 levels, the study found.
The release of methane, a potent greenhouse gas, could further amplify the warming effect. A 2018 study published in the Proceedings of the National Academy of Sciences found that thawing permafrost could release up to 0.3 degrees Celsius of additional warming by 2050. Officials noted that this development underscores the urgent need for global cooperation to mitigate greenhouse gas emissions and adapt to a changing climate.
The process, driven by global warming, could exacerbate warming trends if left unaddressed. Looking ahead, scientists will monitor permafrost thaw rates and associated gas emissions to refine climate projections and inform international policy discussions on emission reductions.
Permafrost, defined as ground that remains frozen for at least two consecutive years, covers approximately a quarter of the Northern Hemisphere’s landmass, primarily in regions such as Siberia, Alaska, Canada, and Greenland. This frozen layer acts as a long-term carbon sink, storing organic material that has accumulated over millennia without decomposing due to consistently low temperatures. As regional temperatures rise at more than twice the global average — a phenomenon known as Arctic amplification — the stability of this frozen reservoir is increasingly compromised.
The thawing of permafrost initiates a feedback loop in climate systems: as organic matter decomposes upon thawing, it releases carbon dioxide and methane, which in turn contribute to further atmospheric warming, potentially accelerating additional thaw. Scientists emphasize that while the total carbon stored in permafrost is well-established, the rate and spatial variability of thaw remain complex to model due to factors such as soil composition, ice content, vegetation cover, and hydrological changes.
These uncertainties are why ongoing observational networks, including satellite monitoring and ground-based sensor arrays, are critical for improving predictive accuracy. Internationally, permafrost dynamics have become a focal point in climate assessments, including reports by the Intergovernmental Panel on Climate Change (IPCC), which highlight the risk of irreversible changes in Arctic systems under continued warming.
The implications extend beyond climate modeling, affecting infrastructure stability in Arctic communities, altering ecosystems, and influencing global carbon budget calculations. As a result, policymakers and researchers alike stress the importance of integrating permafrost feedbacks into national and international climate strategies, particularly those aimed at limiting global temperature rise to well below 2 degrees Celsius above pre-industrial levels.
