lumilämpötilan

Lumilämpötila, sometimes translated as snow temperature, refers to the temperature of snowpack layers within a winter landscape. It is a critical measurement for understanding snowpack stability and the potential for avalanches. Snow temperature varies significantly with depth and time, influenced by factors such as incoming solar radiation, air temperature, wind, and the presence of ground heat.

Generally, snow at the surface is closer to the ambient air temperature, while deeper layers tend to be colder, especially in areas with continuous frost. However, temperature gradients can be complex. For instance, a warm layer within the snowpack, known as a temperature inversion, can indicate a weak layer that may fail under stress. This is because a temperature gradient can lead to sublimation and refreezing processes within the snow, altering its bonding characteristics.

Monitoring snow temperature is a key practice for avalanche forecasters and backcountry travelers. Temperature readings, often taken with specialized probes, help assess the structural integrity of the snowpack. A uniform temperature profile across different depths suggests a more stable snowpack, whereas significant temperature differences can signal potential weaknesses. Understanding these thermal properties of snow is fundamental to predicting avalanche risk and making safe decisions in mountainous terrain during winter.