DEPTH HOAR Meaning and
Definition
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Depth hoar is a type of snow crystal often found in deep snowpacks, particularly in cold and dry winter conditions. It forms through a process known as "faceting." Depth hoar crystals typically have sharp edges and a faceted appearance, resembling large, chunky grains or columns. They are characterized by their high porosity and low density, making them weak and easily breakable.
The formation of depth hoar begins when the snowpack has layers of loose, unconsolidated snow grains that become exposed to cold temperatures, typically below freezing point. These grains then transform into ice crystals as moisture sublimates from the snowpack. As the snow crystals continue to grow, they undergo a process called faceting, where the corners and edges become more pronounced and the overall structure becomes more angular.
Depth hoar is commonly found in areas where temperature gradients exist within the snowpack, promoting the sublimation and crystallization processes. It is often found below the surface of the snowpack, within the deeper layers, where the conditions for faceting are ideal. Depth hoar can pose a risk to backcountry travelers as it weakens the snowpack, creating unstable conditions for avalanches.
Understanding the presence and characteristics of depth hoar is crucial for snow and mountain professionals, as well as winter recreationalists, to assess the stability and safety of snow layers. Studying depth hoar can provide valuable information about the potential for avalanches and aid in decision-making when venturing into snowy and mountainous terrain.
Etymology of DEPTH HOAR
The word "depth hoar" is formed by combining two terms: "depth" and "hoar".
1. "Depth": This word originated from the Old English word "dheopth" or "deopth", which meant "deepness" or "profoundness". Over time, it evolved and was influenced by Old Norse, Middle Dutch, and Middle Low German to become the word we use today. "Depth" refers to the measurement of the distance from the top to the bottom, the extent inward, or the intensity or profundity of something.
2. "Hoar": This term comes from the Old English word "har" or "hār", which means "gray" or "gray-haired". It evolved from the Proto-Germanic word "haira" and is related to words like "hoary" and "gray".
