Loosesnow

Loosesnow is a term occasionally used in snow physics to refer to snow that is loosely packed and exhibits low cohesion between grains. It describes snow that has a fluffy texture, low density, and limited intergranular bonding, making it easily deformed and potentially mobile under small disturbances. This contrasts with more cohesive snow types, such as wind-packed or crusted layers, which can span larger masses without rupturing.

Formation and properties: Loosesnow typically forms from light, dry snowfall with limited compaction. It may develop after periods of warming followed by rapid cooling, or through wind erosion that shatters and redistributes surface crystals. Its mechanical strength is low, and its thermal regime may be close to the surrounding air, influencing metamorphism and stability.

Impact and applications: In avalanche science, loose snow can contribute to loose-snow avalanches, which originate at a focal point and densify downslope. For transportation and infrastructure, loosesnow reduces traction and increases stopping distances. It is a common subject of snowpack assessments, particularly after fresh snowfall events and during spring thaws.

Measurement and study: Researchers assess loosesnow through snow pits, density probes, compression tests, and friction measurements, as well as remote sensing when feasible. Snow models may incorporate loosesnow properties to predict stability and avalanche risk.

Etymology and usage: The term blends “loose” and “snow” to reflect its characteristics and may appear in informal discourse or educational materials. In formal literature, the concept is often discussed under the broader category of unconsolidated surface snow.