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Snow line is an umbrella term for different interpretations of the boundary between snow-covered surface and snow-free surface. The definitions of the snow line may have different temporal and spatial focus.
In astronomy or planetary science, the frost line, also known as the snow line or ice line, is the minimum distance from the central protostar of a solar nebula where the temperature is low enough for volatile compounds such as water, ammonia, methane, carbon dioxide and carbon monoxide to condense into solid grains, which will allow their accretion into planetesimals.
The frost line—also known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the climatic conditions of an area, the heat transfer properties of the soil and adjacent materials, and on nearby heat sources.
The equilibrium line altitude (ELA) or snow line separates the ablation zone from the higher-altitude accumulation zone. [1] The ablation zone often contains meltwater features such as supraglacial lakes, englacial streams, and subglacial lakes. Sediments dropped in the ablation zone forming small mounds or hillocks are called kames.
Winter storms can bring all sorts of precipitation, from snow and sleet to freezing rain and plain old rain. Here's when each type falls.
For the Northern Hemisphere as a whole the mean monthly snow-cover extent has been decreasing by 1.3% per decade. [ 67 ] The most frequently used methods to map and measure snow extent, snow depth and snow water equivalent employ multiple inputs on the visible–infrared spectrum to deduce the presence and properties of snow.
Kines said the snow line will likely fall on Pennsylvania's southern border. "But a lot of things can happen between now and then," he said. "That system is still out in the Pacific."
A snow field, snowfield or neve is an accumulation of permanent snow and ice, typically found above the snow line, normally in mountainous and glacial terrain. [1] Glaciers originate in snowfields. The lower end of a glacier is usually free from snow and névé in summer.