How does liquid water speed up the transformation of snow into glacier ice?

The presence of liquid water significantly accelerates the transformation of snow into glacier ice, causing the process to occur many times more rapidly than it would in dry conditions.1

This acceleration is driven by several key mechanisms:

• Melting and Refreezing: Liquid water facilitates the melting of ice from the extremities of snow grains, which then refreezes elsewhere, helping to fill gaps and increase density.1
• Surface Tension: The compacting force of surface tension helps pull grains together.1
• Regelation: The process of refreezing after pressure melting, known as regelation, contributes to the structural consolidation of the snowpack.1
• Intergranular Freezing: The freezing of liquid water that collects between individual grains further binds the material together, promoting rapid densification.1

These combined actions allow for a much faster transition from snow to firn and eventually to dense glacier ice, particularly in warmer, wetter environments where such transformations can occur in just a few years.1