Northern Permafrost May Become Carbon Source Sooner Than Expected, Models Show
New models suggest that northern permafrost could transition from a carbon sink to a carbon source earlier than previously anticipated. The Arctic and northern high latitudes are experiencing warming at a rate 2 to 4 times faster than the global average, leading to the thawing of ancient permafrost. These permafrost soils hold approximately one-third of the world's organic soil carbon, much of which has been frozen for thousands of years. As the soils thaw, embedded organic matter from dead plants and animals begins to decompose, releasing greenhouse gases, including carbon dioxide.
New models indicate that northern permafrost is likely to switch from being a carbon sink to a carbon source earlier than previous estimates suggested, particularly when deep soil carbon is considered.
The Arctic and northern high latitudes are experiencing significant warming, with temperatures rising at a rate about 2 to 4 times faster than the global average. This rapid warming contributes to the thawing of ancient permafrost layers.
These permafrost soils are substantial reservoirs of organic carbon, storing roughly one-third of the world's total organic soil carbon. Much of this carbon has remained frozen and preserved for thousands of years within the permafrost.
As the permafrost thaws, the organic matter contained within the soils, derived from dead plants and animals, becomes exposed to decomposition. This process leads to the release of greenhouse gases, such as carbon dioxide, into the atmosphere.
According to Phys.org, these findings highlight a potentially accelerated impact of thawing permafrost on global carbon cycles.
