What is the definition of permafrost?

Permafrost is defined as ground that remains frozen for two consecutive years or more. This definition captures the essence of permafrost, which is a key characteristic of polar regions and areas with high latitudes where temperatures are consistently low. The permanence of the frost is crucial; it indicates that the ground does not thaw during the summer, distinguishing it from other types of soil that may only freeze temporarily. This characteristic has significant implications for climate change, as thawing permafrost can release greenhouse gases previously trapped in the soil, thereby influencing global warming. Understanding permafrost is important for studying ecological systems, geological processes, and the impacts of climate change on these frozen landscapes.