How can vehicle traffic disturb the thermal balance of permafrost?

Vehicle traffic disrupts the delicate thermal equilibrium of permafrost primarily by compacting the surface, which includes the vegetation and the active layer of the soil.1

Vegetation acts as an essential insulating medium that shields perennially frozen ground from solar energy. When vehicle traffic disturbs or removes this protective cover, it allows for greater penetration of summer warming into the ground. This disturbance leads to several negative consequences:21

• Thawing: The permafrost table is lowered, the active layer thickens, and significant amounts of ground ice melt.1
• Structural Instability: The resulting wetter, thawed active layer possesses less bearing strength, which can lead to the disruption of drainage and the degradation of the terrain.13
• Environmental Impact: Because Arctic terrains are highly sensitive to such thermal disturbances, the preservation of the original soil climate is of critical environmental importance.3

In areas where permafrost is already thin or warm, such as in the discontinuous zone, this type of human-induced disturbance can lead to the complete destruction of the permafrost.2